{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2023-36844/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Junos OS","J-Web","SRX Series","EX Series"],"_cs_severities":["critical"],"_cs_tags":["juniper","rce","cve-2023-36844","cve-2023-36845","cve-2023-36846","cve-2023-36847"],"_cs_type":"advisory","_cs_vendors":["Juniper Networks"],"content_html":"\u003cp\u003eJuniper Networks devices, specifically those using the J-Web interface, are susceptible to remote code execution vulnerabilities. These vulnerabilities, including CVE-2023-36844, CVE-2023-36845, CVE-2023-36846, and CVE-2023-36847, allow attackers to execute arbitrary code on affected systems. The primary attack vector involves sending malicious requests to the \u003ccode\u003e/webauth_operation.php\u003c/code\u003e endpoint with manipulated \u003ccode\u003ePHPRC\u003c/code\u003e parameters. Successful exploitation grants the attacker unauthorized access, potentially leading to data theft, network compromise, and complete system control. Exploitation attempts have been observed targeting vulnerable Juniper SRX and EX series devices. Publicly available exploit code exists, increasing the likelihood of widespread exploitation.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a vulnerable Juniper Networks device running J-Web.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP POST request targeting the \u003ccode\u003e/webauth_operation.php\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe request includes a \u003ccode\u003ePHPRC\u003c/code\u003e parameter containing PHP code designed to execute commands on the server.\u003c/li\u003e\n\u003cli\u003eThe vulnerable J-Web interface processes the request without proper sanitization.\u003c/li\u003e\n\u003cli\u003eThe attacker's PHP code executes with the privileges of the web server process.\u003c/li\u003e\n\u003cli\u003eThe attacker establishes a reverse shell connection to an external server using \u003ccode\u003enc\u003c/code\u003e or \u003ccode\u003ebash -i\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the reverse shell to execute commands, enumerate the system, and escalate privileges.\u003c/li\u003e\n\u003cli\u003eThe attacker installs a persistent backdoor, exfiltrates sensitive data, and pivots to other internal systems.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of these vulnerabilities allows attackers to gain complete control over Juniper Networks devices. This can lead to data theft, network outages, and further compromise of internal networks. The vulnerabilities affect a wide range of Juniper SRX and EX series devices, potentially impacting numerous organizations. If successful, attackers can deploy ransomware, steal intellectual property, or disrupt critical network services.\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 your SIEM to detect exploitation attempts (rules: \u0026quot;Juniper J-Web RCE via webauth_operation.php\u0026quot; and \u0026quot;Juniper J-Web RCE Reverse Shell\u0026quot;).\u003c/li\u003e\n\u003cli\u003eInspect web server logs for requests to \u003ccode\u003e/webauth_operation.php?PHPRC=*\u003c/code\u003e (IOC: \u003ccode\u003eurl: /webauth_operation.php?PHPRC=*\u003c/code\u003e) and investigate any matches.\u003c/li\u003e\n\u003cli\u003eMonitor for outbound network connections from Juniper devices to unusual or suspicious IP addresses, which may indicate a reverse shell (rule: \u0026quot;Juniper J-Web RCE Reverse Shell\u0026quot;).\u003c/li\u003e\n\u003cli\u003ePatch CVE-2023-36844, CVE-2023-36845, CVE-2023-36846, and CVE-2023-36847 on all affected Juniper devices immediately.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T15:00:00Z","date_published":"2024-01-03T15:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-juniper-rce/","summary":"Exploitation attempts targeting Juniper Networks J-Web interface via the webauth_operation.php endpoint to achieve remote code execution.","title":"Juniper Networks J-Web Remote Code Execution Vulnerability Exploitation","url":"https://feed.craftedsignal.io/briefs/2024-01-juniper-rce/"}],"language":"en","title":"CraftedSignal Threat Feed - Cve-2023-36844","version":"https://jsonfeed.org/version/1.1"}