{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/products/bitbucket/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"id":"CVE-2026-21571"}],"_cs_exploited":false,"_cs_products":["Bamboo","Bitbucket","Confluence","Jira"],"_cs_severities":["critical"],"_cs_tags":["atlassian","vulnerability","code-execution","xss"],"_cs_type":"advisory","_cs_vendors":["Atlassian"],"content_html":"\u003cp\u003eMultiple vulnerabilities exist in Atlassian\u0026rsquo;s Bamboo, Bitbucket, Confluence, and Jira products. While specific CVEs are not detailed in this advisory, the potential impact is significant. An attacker exploiting these vulnerabilities could achieve arbitrary code execution, allowing for complete system compromise. They could also bypass security measures, potentially disabling logging or other security controls. Data manipulation and disclosure could lead to sensitive information compromise and unauthorized modifications. Cross-site scripting (XSS) attacks could be leveraged to steal user credentials or perform actions on behalf of unsuspecting users. Defenders need to ensure the Atlassian suite is fully patched and monitored.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eInitial Access:\u003c/strong\u003e An attacker identifies a vulnerable Atlassian product instance (Bamboo, Bitbucket, Confluence, or Jira) accessible over the network.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eVulnerability Exploitation:\u003c/strong\u003e The attacker leverages an unknown vulnerability to inject malicious code into the application, possibly through a crafted HTTP request.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eCode Execution:\u003c/strong\u003e The injected code executes within the context of the Atlassian application, allowing the attacker to run arbitrary commands on the server.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003ePrivilege Escalation:\u003c/strong\u003e The attacker leverages the initial code execution to escalate privileges, potentially gaining root or administrator access.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eDefense Evasion:\u003c/strong\u003e The attacker attempts to disable security logging or other monitoring mechanisms to avoid detection.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eData Manipulation/Exfiltration:\u003c/strong\u003e The attacker accesses sensitive data stored within the Atlassian application or connected databases, manipulating or exfiltrating it for malicious purposes.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eLateral Movement:\u003c/strong\u003e Using compromised credentials or established footholds, the attacker moves laterally to other systems within the network.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eImpact:\u003c/strong\u003e The attacker achieves their final objective, such as deploying ransomware, stealing intellectual property, or disrupting business operations.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of these vulnerabilities could result in significant damage, including complete compromise of Atlassian servers, data breaches, and disruption of critical business processes. The number of potential victims is substantial, as these Atlassian products are widely used across various industries. The impact ranges from data loss and financial damage to reputational harm and legal liabilities.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rules provided in this brief to detect potential exploitation attempts targeting Atlassian products.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious activity, especially HTTP requests targeting Atlassian applications, to detect potential vulnerability exploitation.\u003c/li\u003e\n\u003cli\u003eEnable and review audit logs within Atlassian products (Bamboo, Bitbucket, Confluence, Jira) for suspicious activity.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to limit the potential impact of a successful breach originating from a compromised Atlassian server.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-28T08:31:27Z","date_published":"2026-04-28T08:31:27Z","id":"/briefs/2026-04-atlassian-vulns/","summary":"Multiple vulnerabilities in Atlassian Bamboo, Bitbucket, Confluence, and Jira allow attackers to execute arbitrary code, bypass security measures, manipulate data, disclose information, or perform cross-site scripting attacks.","title":"Multiple Vulnerabilities in Atlassian Products","url":"https://feed.craftedsignal.io/briefs/2026-04-atlassian-vulns/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Bitbucket"],"_cs_severities":["medium"],"_cs_tags":["attack.defense-impairment","attack.t1685"],"_cs_type":"advisory","_cs_vendors":["Atlassian"],"content_html":"\u003cp\u003eAttackers with sufficient privileges within a Bitbucket project or repository may delete secret scanning rules. These rules are designed to automatically detect and prevent the committing of sensitive information like API keys, passwords, and tokens directly into the codebase. By removing these rules, adversaries can bypass security controls and introduce secrets into the repository undetected. This could be a precursor to a larger attack, where the leaked secrets are used to gain unauthorized access to systems, data, or other resources. This activity may occur as a part of a broader insider threat campaign or an external attacker who has gained control of a privileged account.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker compromises a Bitbucket account with project or repository administrator privileges.\u003c/li\u003e\n\u003cli\u003eThe attacker authenticates to the Bitbucket web interface or uses the Bitbucket API with the compromised account.\u003c/li\u003e\n\u003cli\u003eThe attacker navigates to the project or repository settings where secret scanning rules are configured.\u003c/li\u003e\n\u003cli\u003eThe attacker identifies the secret scanning rules in place.\u003c/li\u003e\n\u003cli\u003eThe attacker initiates the deletion of one or more secret scanning rules through the Bitbucket web interface or API.\u003c/li\u003e\n\u003cli\u003eBitbucket processes the request and removes the specified secret scanning rules.\u003c/li\u003e\n\u003cli\u003eThe attacker (or another compromised account) commits code containing secrets, which are no longer detected due to the deleted rules.\u003c/li\u003e\n\u003cli\u003eThe committed secrets are then potentially used for lateral movement, data exfiltration, or other malicious activities.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eThe deletion of secret scanning rules in Bitbucket can lead to the undetected introduction of sensitive information into the codebase. This can result in unauthorized access to systems, data breaches, and other security incidents. The impact can range from minor data exposure to significant financial losses and reputational damage, depending on the scope and sensitivity of the leaked secrets. Organizations relying on Bitbucket for source code management are vulnerable.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor Bitbucket audit logs for events related to secret scanning rule deletions, using the provided Sigma rule to detect suspicious activity (\u003ccode\u003ebitbucket_audit_secret_scanning_rule_deleted.yml\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eImplement multi-factor authentication (MFA) for all Bitbucket accounts, especially those with administrative privileges, to reduce the risk of account compromise.\u003c/li\u003e\n\u003cli\u003eEnforce the principle of least privilege, ensuring that users only have the necessary permissions to perform their tasks.\u003c/li\u003e\n\u003cli\u003eRegularly review and audit Bitbucket user permissions and access controls.\u003c/li\u003e\n\u003cli\u003eImplement strong password policies and encourage users to use unique, complex passwords.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-11-17T14:22:00Z","date_published":"2024-11-17T14:22:00Z","id":"/briefs/2024-11-bitbucket-secret-rule-deletion/","summary":"Attackers may delete secret scanning rules in Bitbucket to impair defenses and introduce secrets into the code repository undetected, potentially leading to unauthorized access or data breaches.","title":"Bitbucket Secret Scanning Rule Deleted","url":"https://feed.craftedsignal.io/briefs/2024-11-bitbucket-secret-rule-deletion/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Bitbucket"],"_cs_severities":["medium"],"_cs_tags":["lateral-movement","defense-impairment","bitbucket"],"_cs_type":"advisory","_cs_vendors":["Atlassian"],"content_html":"\u003cp\u003eThis brief focuses on the detection of unauthorized changes to Bitbucket\u0026rsquo;s global SSH settings. While the specific actor remains unknown, the modification of these settings is a significant security concern. The activity is detected via Bitbucket audit logs. Modification of global SSH settings can allow attackers to gain unauthorized access to repositories, potentially leading to code compromise, data breaches, or further lateral movement within the network. This activity is particularly important for organizations relying on Bitbucket for source code management and secure development workflows. The audit logs are the primary source of information, specifically focusing on events categorized as \u0026lsquo;Global administration\u0026rsquo; with the action \u0026lsquo;SSH settings changed\u0026rsquo;.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker gains initial access to a Bitbucket account with administrative privileges, possibly through credential compromise or exploiting a vulnerability.\u003c/li\u003e\n\u003cli\u003eThe attacker authenticates to the Bitbucket web interface.\u003c/li\u003e\n\u003cli\u003eThe attacker navigates to the global SSH settings configuration page within the Bitbucket administration panel.\u003c/li\u003e\n\u003cli\u003eThe attacker modifies global SSH settings, such as adding a new public key or changing authentication requirements.\u003c/li\u003e\n\u003cli\u003eBitbucket logs the \u0026lsquo;SSH settings changed\u0026rsquo; event in the audit logs under the \u0026lsquo;Global administration\u0026rsquo; category.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the modified SSH settings to clone repositories or push malicious code.\u003c/li\u003e\n\u003cli\u003eThe attacker uses compromised code or data to move laterally within the organization\u0026rsquo;s network, targeting other systems and resources.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful modification of Bitbucket global SSH settings can allow unauthorized access to all repositories within the Bitbucket instance. This can lead to code theft, injection of malicious code, and data breaches. The impact may extend beyond the Bitbucket environment if the compromised code is deployed to production systems or used in other development processes. Organizations using Bitbucket for critical projects are at higher risk.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the provided Sigma rule to your SIEM to detect unauthorized changes to Bitbucket global SSH settings in the audit logs.\u003c/li\u003e\n\u003cli\u003eInvestigate any detected instances of \u0026ldquo;SSH settings changed\u0026rdquo; in the Bitbucket audit logs to determine the legitimacy of the changes.\u003c/li\u003e\n\u003cli\u003eEnforce multi-factor authentication (MFA) for all Bitbucket accounts, especially those with administrative privileges, to mitigate credential compromise as an initial access vector.\u003c/li\u003e\n\u003cli\u003eReview Bitbucket\u0026rsquo;s audit log configuration to ensure the \u0026ldquo;Advance\u0026rdquo; log level is enabled to capture the necessary audit events.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-11-01T12:00:00Z","date_published":"2024-11-01T12:00:00Z","id":"/briefs/2024-11-bitbucket-ssh-change/","summary":"An attacker modifies Bitbucket global SSH settings to potentially enable unauthorized access and lateral movement.","title":"Bitbucket Global SSH Settings Changed","url":"https://feed.craftedsignal.io/briefs/2024-11-bitbucket-ssh-change/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Bitbucket"],"_cs_severities":["medium"],"_cs_tags":["attack.defense-impairment","attack.t1562.004","bitbucket"],"_cs_type":"advisory","_cs_vendors":["Atlassian"],"content_html":"\u003cp\u003eAttackers may target Bitbucket audit log configurations to reduce or eliminate logging, thereby hindering incident response and forensic investigations. Modifying audit settings is a defense evasion technique that allows malicious actors to operate with less visibility. This activity typically occurs post-compromise. This brief focuses on detecting such modifications. Visibility of audit events requires at least \u0026ldquo;Basic\u0026rdquo; log level configuration.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker gains unauthorized access to a Bitbucket instance, potentially through compromised credentials or exploiting a vulnerability.\u003c/li\u003e\n\u003cli\u003eThe attacker authenticates to the Bitbucket web interface or uses the Bitbucket API.\u003c/li\u003e\n\u003cli\u003eThe attacker navigates to the audit log configuration settings within the Bitbucket administration panel.\u003c/li\u003e\n\u003cli\u003eThe attacker modifies the audit log settings, such as disabling logging for specific event categories or reducing the log retention period.\u003c/li\u003e\n\u003cli\u003eThe Bitbucket server processes the configuration change request.\u003c/li\u003e\n\u003cli\u003eAudit events related to the configuration change are logged (if auditing is still enabled for such events).\u003c/li\u003e\n\u003cli\u003eThe attacker performs malicious activities, such as creating unauthorized repositories or exfiltrating source code, with reduced risk of detection.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful modification of the Bitbucket audit log configuration allows attackers to operate with significantly reduced visibility. This can lead to delayed detection of breaches, prolonged dwell time, and increased data exfiltration. Without proper audit logging, organizations will struggle to identify the scope and impact of a compromise.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the \u0026ldquo;Bitbucket Audit Log Configuration Updated\u0026rdquo; Sigma rule to your SIEM to detect changes to audit log configurations (logsource: bitbucket, service: audit).\u003c/li\u003e\n\u003cli\u003eEnsure Bitbucket audit logging is enabled at the \u0026ldquo;Basic\u0026rdquo; level or higher, as lower levels may not capture configuration changes (logsource: bitbucket, service: audit).\u003c/li\u003e\n\u003cli\u003eInvestigate any detected instances of audit log configuration changes to determine if they are authorized (Sigma rule: \u0026ldquo;Bitbucket Audit Log Configuration Updated\u0026rdquo;).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-10-26T12:00:00Z","date_published":"2024-10-26T12:00:00Z","id":"/briefs/2024-10-bitbucket-audit-config-mod/","summary":"An attacker may modify the Bitbucket audit log configuration to impair security monitoring and evade detection.","title":"Bitbucket Audit Log Configuration Modified","url":"https://feed.craftedsignal.io/briefs/2024-10-bitbucket-audit-config-mod/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Bitbucket"],"_cs_severities":["medium"],"_cs_tags":["attack.defense-impairment","attack.t1685"],"_cs_type":"advisory","_cs_vendors":["Atlassian"],"content_html":"\u003cp\u003eThis threat brief addresses the deletion of global secret scanning rules within Bitbucket environments. Secret scanning is a crucial defense mechanism used to prevent sensitive information, such as API keys and passwords, from being committed to repositories. An attacker with global administration privileges could intentionally delete these rules to bypass security controls. This action could occur post-compromise, as part of an insider threat, or due to accidental misconfiguration. The impact of this activity centers around an increased risk of sensitive data exposure, which can lead to further compromise or data breaches. Defenders should monitor Bitbucket audit logs for such deletions.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker gains valid credentials with global administrator privileges within the Bitbucket environment, possibly through credential stuffing or phishing.\u003c/li\u003e\n\u003cli\u003eThe attacker authenticates to the Bitbucket web interface or uses the Bitbucket API with their compromised credentials.\u003c/li\u003e\n\u003cli\u003eThe attacker navigates to the global secret scanning rule configuration page.\u003c/li\u003e\n\u003cli\u003eThe attacker identifies and selects one or more global secret scanning rules currently in effect.\u003c/li\u003e\n\u003cli\u003eThe attacker initiates the deletion process for the selected rules, confirming the action when prompted.\u003c/li\u003e\n\u003cli\u003eBitbucket processes the deletion request, removing the rules from the global configuration.\u003c/li\u003e\n\u003cli\u003eThe system generates an audit log event indicating the deletion of the global secret scanning rule.\u003c/li\u003e\n\u003cli\u003eWith secret scanning disabled, developers may inadvertently commit secrets into Bitbucket repositories, making them available to the attacker.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful deletion of global secret scanning rules can have significant impact. Without active secret scanning, developers may unintentionally commit sensitive information (API keys, passwords, tokens) into Bitbucket repositories. This could lead to account takeovers, data breaches, or lateral movement within the organization\u0026rsquo;s infrastructure. The number of affected repositories and exposed secrets will vary depending on the scope of the attacker\u0026rsquo;s access and the activity of developers during the period when the rules were disabled.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the provided Sigma rule to detect the deletion of global secret scanning rules in Bitbucket audit logs, focusing on \u003ccode\u003eauditType.category: 'Global administration'\u003c/code\u003e and \u003ccode\u003eauditType.action: 'Global secret scanning rule deleted'\u003c/code\u003e (Sigma rule).\u003c/li\u003e\n\u003cli\u003eInvestigate any detected instances of global secret scanning rule deletion to determine if the action was authorized and performed by a legitimate user.\u003c/li\u003e\n\u003cli\u003eImplement multi-factor authentication (MFA) for all Bitbucket accounts, especially those with administrative privileges, to reduce the risk of credential compromise.\u003c/li\u003e\n\u003cli\u003eRegularly review Bitbucket user permissions and roles to ensure that users have only the necessary level of access.\u003c/li\u003e\n\u003cli\u003eEnable \u0026ldquo;Basic\u0026rdquo; logging level, as required, to ensure the necessary audit events are generated (logsource definition).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-04-29T14:00:00Z","date_published":"2024-04-29T14:00:00Z","id":"/briefs/2024-04-bitbucket-secret-rule-delete/","summary":"An adversary with administrative privileges may delete global secret scanning rules in Bitbucket to impair defenses and exfiltrate sensitive data without detection.","title":"Bitbucket Global Secret Scanning Rule Deletion","url":"https://feed.craftedsignal.io/briefs/2024-04-bitbucket-secret-rule-delete/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Bitbucket"],"_cs_severities":["low"],"_cs_tags":["attack.defense-impairment","attack.t1685"],"_cs_type":"advisory","_cs_vendors":["Atlassian"],"content_html":"\u003cp\u003eThe addition of a secret scanning allowlist rule to a Bitbucket project can be abused by malicious actors to bypass security controls. While not inherently malicious, this action can be exploited to weaken an organization\u0026rsquo;s security posture. Secret scanning tools are designed to prevent the accidental or intentional commit of sensitive information (API keys, passwords, etc.) into version control systems. By adding an allowlist rule, specific patterns or files can be excluded from these scans. This could be leveraged by an attacker who has gained access to a Bitbucket account or project to intentionally introduce secrets while avoiding detection. The activity is logged by Bitbucket\u0026rsquo;s audit logs, providing an opportunity for detection.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker gains unauthorized access to a Bitbucket account with sufficient privileges to modify project settings.\u003c/li\u003e\n\u003cli\u003eThe attacker navigates to the project settings within Bitbucket.\u003c/li\u003e\n\u003cli\u003eThe attacker accesses the secret scanning configuration for the project.\u003c/li\u003e\n\u003cli\u003eThe attacker adds a new allowlist rule, specifying a pattern or file to be excluded from secret scanning.\u003c/li\u003e\n\u003cli\u003eThe attacker commits code containing secrets that match the allowlist rule, effectively bypassing the secret scanning tool.\u003c/li\u003e\n\u003cli\u003eThe changes are pushed to the Bitbucket repository.\u003c/li\u003e\n\u003cli\u003eThe secrets remain undetected due to the allowlist rule.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the exposed secrets for further malicious activities, such as gaining access to other systems or data.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation could lead to the exposure of sensitive information such as API keys, passwords, or other credentials. This can result in unauthorized access to internal systems, data breaches, and reputational damage. The number of affected projects depends on the scope of the attacker\u0026rsquo;s access and the configuration of the allowlist rule. The addition of the allowlist rule itself does not directly cause damage but creates a window of opportunity for the introduction and persistence of secrets within the codebase.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the provided Sigma rule to your SIEM to detect the addition of secret scanning allowlist rules (logsource: bitbucket, service: audit).\u003c/li\u003e\n\u003cli\u003eInvestigate any detected instances of allowlist rule additions to verify their legitimacy and business justification.\u003c/li\u003e\n\u003cli\u003eReview and enforce strict access controls for Bitbucket projects to minimize the risk of unauthorized modifications.\u003c/li\u003e\n\u003cli\u003eEnable \u0026ldquo;Basic\u0026rdquo; log level in Bitbucket to ensure that the audit events required for detection are captured, as indicated in the rule definition.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-04-29T12:00:00Z","date_published":"2024-04-29T12:00:00Z","id":"/briefs/2024-04-bitbucket-secret-scanning-allowlist/","summary":"An adversary may impair defenses by adding a secret scanning allowlist rule for Bitbucket projects, potentially allowing secrets to be committed and exposed.","title":"Bitbucket Project Secret Scanning Allowlist Added","url":"https://feed.craftedsignal.io/briefs/2024-04-bitbucket-secret-scanning-allowlist/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Bitbucket"],"_cs_severities":["medium"],"_cs_tags":["bitbucket","authentication","brute-force","credential-access","initial-access"],"_cs_type":"advisory","_cs_vendors":["Atlassian"],"content_html":"\u003cp\u003eThis threat brief focuses on detecting user login failures within Bitbucket environments. Monitoring failed login attempts is crucial as it can indicate various malicious activities, including credential stuffing, brute-force attacks, or attempts to gain unauthorized initial access. The audit logs in Bitbucket record details of these authentication failures, providing valuable data for security monitoring. The rule provided detects these events and can be used for correlation with other security events based on the \u0026ldquo;author.name\u0026rdquo; field for enhanced accuracy and context. Requires \u0026ldquo;Advance\u0026rdquo; log level to receive audit events.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eInitial Access Attempt:\u003c/strong\u003e An attacker attempts to gain initial access to a Bitbucket account using a compromised or guessed username.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eCredential Guessing:\u003c/strong\u003e The attacker attempts to guess the user\u0026rsquo;s password through manual attempts or automated tools.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eAuthentication Failure:\u003c/strong\u003e Bitbucket records a \u0026ldquo;User login failed\u0026rdquo; event due to incorrect credentials. The \u003ccode\u003eauditType.category\u003c/code\u003e is Authentication, and \u003ccode\u003eauditType.action\u003c/code\u003e is User login failed.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eMultiple Failed Attempts:\u003c/strong\u003e The attacker repeats the login attempts with different password variations or using a list of compromised credentials.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eAccount Lockout (Optional):\u003c/strong\u003e Depending on Bitbucket\u0026rsquo;s configuration, repeated failed login attempts may trigger an account lockout.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eSuccessful Login (Potential):\u003c/strong\u003e After multiple attempts, the attacker may eventually guess the correct password or use a valid compromised credential.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003ePrivilege Escalation/Persistence (If Successful):\u003c/strong\u003e If successful, the attacker could escalate privileges, establish persistence, or perform other malicious actions within the Bitbucket environment.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation can lead to unauthorized access to sensitive code repositories, intellectual property theft, and potential supply chain compromise. Attackers could inject malicious code, modify existing code, or exfiltrate sensitive data. Detecting these failed login attempts early can prevent significant damage. Although the number of victims cannot be determined with this specific detection, a successful attack can have far-reaching impacts.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Bitbucket User Login Failure\u0026rdquo; to your SIEM to detect suspicious authentication failures (logsource: bitbucket, service: audit). Tune for your environment by correlating on the author.name field.\u003c/li\u003e\n\u003cli\u003eInvestigate the source IP addresses associated with the failed login attempts to identify potential malicious actors.\u003c/li\u003e\n\u003cli\u003eImplement multi-factor authentication (MFA) to significantly reduce the risk of successful credential-based attacks.\u003c/li\u003e\n\u003cli\u003eMonitor for unusual activity following any successful login after a series of failures.\u003c/li\u003e\n\u003cli\u003eEnforce strong password policies to reduce the effectiveness of brute-force attacks.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-03-08T15:00:00Z","date_published":"2024-03-08T15:00:00Z","id":"/briefs/2024-03-bitbucket-login-fail/","summary":"Detection of Bitbucket user login failures, potentially indicating credential access attempts, initial access attempts, or other malicious activity.","title":"Bitbucket User Login Failure Detection","url":"https://feed.craftedsignal.io/briefs/2024-03-bitbucket-login-fail/"}],"language":"en","title":"CraftedSignal Threat Feed — Bitbucket","version":"https://jsonfeed.org/version/1.1"}