{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/ekg-gadu/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":["EKG Gadu"],"_cs_severities":["high"],"_cs_tags":["buffer-overflow","local-privilege-escalation","cve-2016-20047"],"_cs_type":"advisory","_cs_vendors":["EKG Gadu"],"content_html":"\u003cp\u003eEKG Gadu 1.9~pre+r2855-3+b1 is susceptible to a local buffer overflow vulnerability, identified as CVE-2016-20047. This flaw resides within the application's username handling mechanism. A local attacker can exploit this vulnerability by providing an overly long username string, exceeding the buffer's capacity. Successful exploitation allows the attacker to overwrite the instruction pointer, leading to the execution of arbitrary code with the privileges of the user running EKG Gadu. The vulnerability exists due to the use of \u003ccode\u003estrlcpy\u003c/code\u003e without proper bounds checking. This vulnerability was published on 2026-03-28.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains local access to a system with EKG Gadu 1.9~pre+r2855-3+b1 installed.\u003c/li\u003e\n\u003cli\u003eAttacker identifies the vulnerable username handling function within EKG Gadu.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious input string exceeding 258 bytes intended for the username field.\u003c/li\u003e\n\u003cli\u003eThe attacker triggers the vulnerability by providing the oversized username through the application's interface or configuration.\u003c/li\u003e\n\u003cli\u003eEKG Gadu attempts to copy the oversized username into a fixed-size buffer using \u003ccode\u003estrlcpy\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003estrlcpy\u003c/code\u003e function overflows the buffer, overwriting adjacent memory regions, including the instruction pointer.\u003c/li\u003e\n\u003cli\u003eThe attacker's crafted input includes shellcode designed to execute arbitrary commands.\u003c/li\u003e\n\u003cli\u003eWhen EKG Gadu attempts to return from the function, it jumps to the attacker-controlled instruction pointer, executing the shellcode and gaining arbitrary code execution.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2016-20047 allows a local attacker to execute arbitrary code with the privileges of the user running EKG Gadu. This can lead to complete system compromise, data theft, or denial of service. The vulnerability requires local access, limiting the scope of potential victims to systems where the attacker already has a foothold.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIdentify and remove installations of EKG Gadu 1.9~pre+r2855-3+b1 to eliminate the vulnerable application.\u003c/li\u003e\n\u003cli\u003eMonitor process creation events for EKG Gadu spawning unusual processes, as this could indicate exploitation, using the Sigma rule \u0026quot;Detect EKG Gadu Suspicious Process Creation\u0026quot;.\u003c/li\u003e\n\u003cli\u003eImplement host-based intrusion detection systems (HIDS) to detect attempts to exploit buffer overflows, with specific focus on applications using the \u003ccode\u003estrlcpy\u003c/code\u003e function.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-26T10:00:00Z","date_published":"2024-01-26T10:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-26-ekg-gadu-buffer-overflow/","summary":"EKG Gadu 1.9~pre+r2855-3+b1 is vulnerable to a local buffer overflow (CVE-2016-20047) in username handling, allowing attackers to execute arbitrary code by providing an oversized username string.","title":"EKG Gadu 1.9 Local Buffer Overflow Vulnerability (CVE-2016-20047)","url":"https://feed.craftedsignal.io/briefs/2024-01-26-ekg-gadu-buffer-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed - EKG Gadu","version":"https://jsonfeed.org/version/1.1"}