{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/libxml2/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":["libxml2"],"_cs_severities":["high"],"_cs_tags":["xxe","libxml2","vulnerability"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA vulnerability exists within the libxml2 library that could be exploited by an unauthenticated remote attacker. This weakness allows for manipulation of files or the initiation of a denial-of-service condition. Given the widespread usage of libxml2 across numerous applications and platforms for XML parsing, this vulnerability poses a significant risk. Successful exploitation could lead to unauthorized data modification, application instability, or complete service disruption. Defenders should prioritize identifying and mitigating systems relying on vulnerable versions of libxml2 to prevent potential exploitation attempts and maintain system integrity.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a web application using a vulnerable version of libxml2.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious XML document containing an External Entity (XXE) payload.\u003c/li\u003e\n\u003cli\u003eThe attacker submits the malicious XML document to the vulnerable web application endpoint.\u003c/li\u003e\n\u003cli\u003eThe libxml2 library parses the XML document and processes the External Entity.\u003c/li\u003e\n\u003cli\u003eThe External Entity contains a URI that points to a local file on the server.\u003c/li\u003e\n\u003cli\u003eThe libxml2 library accesses and reads the specified local file.\u003c/li\u003e\n\u003cli\u003eThe contents of the local file are included in the XML parsing results.\u003c/li\u003e\n\u003cli\u003eThe attacker retrieves the contents of the local file, potentially containing sensitive information, or causes a denial of service.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this libxml2 vulnerability can lead to unauthorized access to sensitive data residing on the targeted system, manipulation of application files leading to data integrity issues, and denial-of-service conditions rendering the application unavailable. The impact ranges from information disclosure to complete system compromise. The widespread use of libxml2 means a successful exploit has the potential to affect a large number of systems across various sectors.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor web server logs (category \u003ccode\u003ewebserver\u003c/code\u003e, product \u003ccode\u003elinux\u003c/code\u003e or \u003ccode\u003ewindows\u003c/code\u003e) for suspicious XML POST requests containing common XXE payloads.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect Suspicious XML POST Requests\u003c/code\u003e to identify potential XXE attack attempts.\u003c/li\u003e\n\u003cli\u003eImplement input validation and sanitization for XML data to prevent the processing of malicious External Entities, as detailed in the attack chain.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-07-03T12:00:00Z","date_published":"2024-07-03T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-07-libxml2-xxe/","summary":"A remote, anonymous attacker can exploit a vulnerability in libxml2 to manipulate files or cause a denial of service.","title":"libxml2 Vulnerability Allows XXE Attacks","url":"https://feed.craftedsignal.io/briefs/2024-07-libxml2-xxe/"}],"language":"en","title":"CraftedSignal Threat Feed - Libxml2","version":"https://jsonfeed.org/version/1.1"}