{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/man-in-the-middle/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":5.3,"id":"CVE-2026-34073"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["certificate validation","man-in-the-middle","dns name constraint","tls","cve-2026-34073"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-34073 describes a security vulnerability related to incomplete DNS name constraint enforcement affecting an unspecified Microsoft product. The vulnerability lies in the improper validation of peer names against DNS name constraints during certificate validation. An attacker could potentially exploit this flaw to bypass security checks and impersonate legitimate servers or services. Further details regarding the specific affected products and exploitation scenarios are currently unavailable but are anticipated to be released by Microsoft. Defenders should closely monitor Microsoft\u0026rsquo;s official communication channels for updates and guidance.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003cp\u003eAs the vulnerability details are limited, the following attack chain is based on a generalized understanding of how incomplete DNS name constraint enforcement could be exploited.\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker crafts a malicious certificate with a DNS name that is designed to bypass the incomplete constraint enforcement.\u003c/li\u003e\n\u003cli\u003eThe attacker sets up a rogue server or service using the crafted certificate.\u003c/li\u003e\n\u003cli\u003eA client application (potentially within the Microsoft ecosystem) attempts to establish a secure connection with the attacker\u0026rsquo;s server.\u003c/li\u003e\n\u003cli\u003eDuring the TLS handshake, the client application receives the malicious certificate.\u003c/li\u003e\n\u003cli\u003eDue to the incomplete DNS name constraint enforcement, the client application incorrectly validates the certificate as trusted.\u003c/li\u003e\n\u003cli\u003eA secure connection is established between the client and the attacker\u0026rsquo;s server.\u003c/li\u003e\n\u003cli\u003eThe attacker intercepts or manipulates data transmitted over the \u0026ldquo;secure\u0026rdquo; connection.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-34073 could allow an attacker to perform man-in-the-middle attacks, intercept sensitive data, or impersonate legitimate services. The specific impact depends on the affected product and the context in which the vulnerability is exploited. Given the potential for widespread impact within Microsoft environments, this vulnerability is considered high severity.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor Microsoft\u0026rsquo;s Security Update Guide for specific product advisories and patches related to CVE-2026-34073 (\u003ca href=\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34073)\"\u003ehttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34073)\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eDeploy any available patches or workarounds as soon as they are released by Microsoft to mitigate the risk of exploitation.\u003c/li\u003e\n\u003cli\u003eImplement network monitoring to detect anomalous TLS certificate exchanges that may indicate exploitation attempts.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-30T07:46:18Z","date_published":"2026-04-30T07:46:18Z","id":"/briefs/2024-01-cve-2026-34073/","summary":"CVE-2026-34073 is a vulnerability in unspecified Microsoft products due to incomplete DNS name constraint enforcement on peer names, potentially leading to certificate validation bypass.","title":"CVE-2026-34073: Incomplete DNS Name Constraint Enforcement Vulnerability","url":"https://feed.craftedsignal.io/briefs/2024-01-cve-2026-34073/"},{"_cs_actors":[],"_cs_cves":[{"cvss":7.4,"id":"CVE-2026-35560"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["cve-2026-35560","athena","odbc","man-in-the-middle","mitm","credential-theft"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA man-in-the-middle (MitM) vulnerability has been identified in the Amazon Athena ODBC driver. Specifically, versions prior to 2.1.0.0 exhibit improper certificate validation within the identity provider connection components. This flaw allows a threat actor positioned in the network to intercept authentication credentials when the driver attempts to connect to external identity providers. This vulnerability, identified as CVE-2026-35560, poses a significant risk to organizations utilizing affected versions of the Athena ODBC driver with external identity providers. The lack of proper certificate validation can lead to credential compromise and subsequent unauthorized access to sensitive data within Athena. This does not affect connections directly to Athena.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker positions themselves in a privileged network location between the user\u0026rsquo;s machine and the external identity provider.\u003c/li\u003e\n\u003cli\u003eThe user attempts to establish a connection to Amazon Athena using the vulnerable ODBC driver version (prior to 2.1.0.0). The connection is configured to use an external identity provider for authentication.\u003c/li\u003e\n\u003cli\u003eThe ODBC driver initiates a connection to the configured external identity provider.\u003c/li\u003e\n\u003cli\u003eThe attacker intercepts the network traffic between the ODBC driver and the identity provider.\u003c/li\u003e\n\u003cli\u003eDue to the lack of proper certificate validation in the vulnerable ODBC driver, the attacker can present a fraudulent certificate to the driver without triggering an error.\u003c/li\u003e\n\u003cli\u003eThe ODBC driver, trusting the fraudulent certificate, proceeds with the authentication process and transmits the user\u0026rsquo;s credentials to the attacker-controlled server.\u003c/li\u003e\n\u003cli\u003eThe attacker captures the user\u0026rsquo;s authentication credentials (e.g., username and password or an access token).\u003c/li\u003e\n\u003cli\u003eThe attacker uses the stolen credentials to authenticate to the external identity provider or directly to resources protected by those credentials, potentially gaining unauthorized access to sensitive data within Amazon Athena or other connected services.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability allows a man-in-the-middle attacker to intercept authentication credentials used to connect to external identity providers. This could lead to unauthorized access to an organization\u0026rsquo;s Amazon Athena data and other resources protected by the compromised credentials. The severity of the impact depends on the privileges associated with the compromised user account. If successful, the attacker could potentially read, modify, or delete sensitive data stored in Athena, leading to data breaches, financial losses, and reputational damage. The number of potential victims is directly proportional to the number of organizations using affected versions of the Athena ODBC driver with external identity providers.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the Amazon Athena ODBC driver to version 2.1.0.0 or later to remediate the improper certificate validation vulnerability as documented in CVE-2026-35560.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for unexpected connections to external identity providers from machines running the Athena ODBC driver. Use network connection logs to identify suspicious activity.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to limit the potential impact of a successful man-in-the-middle attack, reducing the attacker\u0026rsquo;s ability to intercept traffic.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-03T21:17:12Z","date_published":"2026-04-03T21:17:12Z","id":"/briefs/2024-01-athena-odbc-mitm/","summary":"A man-in-the-middle vulnerability exists in Amazon Athena ODBC driver versions prior to 2.1.0.0 due to improper certificate validation, potentially allowing attackers to intercept authentication credentials when connecting to external identity providers.","title":"Amazon Athena ODBC Driver Man-in-the-Middle Vulnerability","url":"https://feed.craftedsignal.io/briefs/2024-01-athena-odbc-mitm/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["certificate-forgery","man-in-the-middle","node-forge","basicConstraints"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA critical vulnerability exists in the node-forge npm package, specifically in versions 1.3.3 and earlier. The \u003ccode\u003epki.verifyCertificateChain()\u003c/code\u003e function doesn\u0026rsquo;t properly validate the \u003ccode\u003ebasicConstraints\u003c/code\u003e extension during certificate chain verification, as specified in RFC 5280. When an intermediate certificate lacks both the \u003ccode\u003ebasicConstraints\u003c/code\u003e and \u003ccode\u003ekeyUsage\u003c/code\u003e extensions, the verification process incorrectly skips crucial checks, leading to the acceptance of the certificate as a valid CA. This allows attackers to forge certificates and perform man-in-the-middle attacks against applications using node-forge for custom PKI implementations, S/MIME signature verification, IoT device certificate validation, or any other non-native TLS certificate chain verification. The vulnerability was reported on 2026-03-10 via GitHub Security Advisory and assigned CVE-2026-33896.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker obtains a valid leaf certificate (e.g., a TLS certificate) that lacks both the \u003ccode\u003ebasicConstraints\u003c/code\u003e and \u003ccode\u003ekeyUsage\u003c/code\u003e extensions.\u003c/li\u003e\n\u003cli\u003eThe attacker uses this leaf certificate to sign a malicious certificate for a target domain (e.g., \u003ccode\u003evictim.example.com\u003c/code\u003e). The forged certificate appears to be issued by a legitimate but compromised CA.\u003c/li\u003e\n\u003cli\u003eThe attacker intercepts network traffic between a client and a server.\u003c/li\u003e\n\u003cli\u003eThe attacker presents the forged certificate chain (root CA -\u0026gt; compromised leaf CA -\u0026gt; malicious certificate for victim.example.com) to the client.\u003c/li\u003e\n\u003cli\u003eThe client application uses node-forge\u0026rsquo;s \u003ccode\u003epki.verifyCertificateChain()\u003c/code\u003e function to validate the certificate chain.\u003c/li\u003e\n\u003cli\u003eDue to the missing \u003ccode\u003ebasicConstraints\u003c/code\u003e and \u003ccode\u003ekeyUsage\u003c/code\u003e extensions in the compromised leaf certificate, the validation process incorrectly accepts the certificate chain as valid.\u003c/li\u003e\n\u003cli\u003eThe client establishes a TLS connection with the attacker, believing they are communicating with the legitimate server.\u003c/li\u003e\n\u003cli\u003eThe attacker can then eavesdrop on, modify, or block the communication between the client and the server, leading to data theft, account compromise, or denial of service.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability can lead to complete compromise of applications relying on node-forge for certificate validation. An attacker can forge certificates for any domain, allowing them to perform man-in-the-middle attacks, intercept sensitive data, and impersonate legitimate services.  The number of potential victims is large, affecting any application using node-forge for custom PKI implementations, S/MIME signature verification, IoT device certificate validation, and any non-native-TLS certificate chain verification.  The severity is high, as it bypasses fundamental security controls related to certificate trust.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade to node-forge version 1.3.4 or later, which includes the fix for CVE-2026-33896.\u003c/li\u003e\n\u003cli\u003eDeploy the following Sigma rule to detect the execution of node-forge with vulnerable versions to identify potentially affected systems.\u003c/li\u003e\n\u003cli\u003eIf upgrading is not immediately feasible, consider patching the \u003ccode\u003elib/x509.js\u003c/code\u003e file in your node-forge installation with the fix suggested in the advisory.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-03-26T22:06:12Z","date_published":"2026-03-26T22:06:12Z","id":"/briefs/2026-07-node-forge-basic-constraints-bypass/","summary":"Node-forge's certificate chain verification fails to enforce RFC 5280 basicConstraints, allowing leaf certificates without basicConstraints and keyUsage extensions to act as Certificate Authorities, leading to potential certificate forgery and man-in-the-middle attacks.","title":"Node-Forge Certificate Chain Verification Bypass due to basicConstraints Violation","url":"https://feed.craftedsignal.io/briefs/2026-07-node-forge-basic-constraints-bypass/"}],"language":"en","title":"CraftedSignal Threat Feed — Man-in-the-Middle","version":"https://jsonfeed.org/version/1.1"}