{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/certificate_chain/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":5.5,"id":"CVE-2026-3229"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["integer_overflow","certificate_chain","denial_of_service","code_execution","cve"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-3229 is an integer overflow vulnerability within a Microsoft product related to certificate chain allocation. An attacker could potentially exploit this vulnerability to cause a denial-of-service condition or, in more severe scenarios, achieve arbitrary code execution on a vulnerable system. The specific product affected is not detailed in the provided source, but the vulnerability lies in how the product handles certificate chain allocation. The attack likely involves crafting a malicious certificate chain that, when processed by the vulnerable software, triggers the integer overflow. This could lead to memory corruption and, ultimately, a crash or code execution. Defenders should monitor for exploitation attempts targeting certificate processing functions within Microsoft products.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker crafts a malicious certificate chain specifically designed to trigger an integer overflow during allocation.\u003c/li\u003e\n\u003cli\u003eThe attacker delivers the crafted certificate chain to the targeted system. This could be achieved through various methods, such as embedding the certificate in a network request.\u003c/li\u003e\n\u003cli\u003eThe vulnerable Microsoft product attempts to process the certificate chain.\u003c/li\u003e\n\u003cli\u003eDuring the certificate chain processing, the software calculates the required memory allocation size based on the provided certificates.\u003c/li\u003e\n\u003cli\u003eThe calculation results in an integer overflow, leading to a smaller-than-expected memory allocation.\u003c/li\u003e\n\u003cli\u003eThe software copies the certificate chain data into the undersized memory buffer.\u003c/li\u003e\n\u003cli\u003eThis memory corruption leads to a denial-of-service condition or, potentially, allows the attacker to overwrite adjacent memory regions.\u003c/li\u003e\n\u003cli\u003eIf the attacker gains control of overwritten memory, they can potentially inject and execute arbitrary code on the system.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-3229 can lead to a denial-of-service condition, disrupting the availability of the affected Microsoft product. In more severe cases, an attacker can achieve arbitrary code execution, allowing them to gain control over the compromised system. The number of potential victims is dependent on the vulnerable product\u0026rsquo;s deployment scale. Sectors reliant on the affected Microsoft product may experience service disruptions and data breaches.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor process creation events for unexpected processes spawned by the vulnerable Microsoft product after certificate processing (process_creation).\u003c/li\u003e\n\u003cli\u003eDeploy the provided Sigma rule to detect potential exploitation attempts based on abnormal memory allocation patterns (see \u0026ldquo;Detect Suspicious Memory Allocation\u0026rdquo; rule).\u003c/li\u003e\n\u003cli\u003eAnalyze network traffic for suspicious certificate exchanges involving unusually large or malformed certificates.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-25T17:00:00Z","date_published":"2024-01-25T17:00:00Z","id":"/briefs/2024-01-25-cve-2026-3229/","summary":"CVE-2026-3229 is an integer overflow vulnerability in certificate chain allocation affecting a Microsoft product, potentially leading to denial of service or arbitrary code execution.","title":"CVE-2026-3229 Integer Overflow in Certificate Chain Allocation","url":"https://feed.craftedsignal.io/briefs/2024-01-25-cve-2026-3229/"}],"language":"en","title":"CraftedSignal Threat Feed — Certificate_chain","version":"https://jsonfeed.org/version/1.1"}