{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/telnetd/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":["telnetd"],"_cs_severities":["critical"],"_cs_tags":["cve-2026-32746","telnetd","buffer-overflow","linux"],"_cs_type":"advisory","_cs_vendors":["GNU"],"content_html":"\u003cp\u003eA critical buffer overflow vulnerability, tracked as CVE-2026-32746, has been identified in GNU telnetd. This vulnerability, if exploited, could allow an unauthenticated attacker to execute arbitrary code on a vulnerable system. A proof-of-concept (PoC) exploit is publicly available, increasing the risk of exploitation. The vulnerability affects Linux systems running vulnerable versions of GNU telnetd. Defenders should prioritize patching and implementing detection measures to mitigate potential exploitation. This vulnerability poses a significant threat to system integrity and confidentiality.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker identifies a vulnerable system running GNU telnetd.\u003c/li\u003e\n\u003cli\u003eThe attacker connects to the telnet service on the target system (typically port 23).\u003c/li\u003e\n\u003cli\u003eThe attacker sends a specially crafted input string to the telnetd service, exploiting the buffer overflow in the telnetd process.\u003c/li\u003e\n\u003cli\u003eThe overflow overwrites critical memory regions, including the return address on the stack.\u003c/li\u003e\n\u003cli\u003eThe attacker redirects execution flow to attacker-controlled code injected into the process's memory space via the overflow.\u003c/li\u003e\n\u003cli\u003eThe attacker's code executes with the privileges of the telnetd process (typically root or a system account).\u003c/li\u003e\n\u003cli\u003eThe attacker gains a remote shell on the target system.\u003c/li\u003e\n\u003cli\u003eThe attacker can then perform privileged actions, install malware, or exfiltrate data.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-32746 can lead to complete system compromise. An attacker could gain root access, allowing them to install malware, steal sensitive data, or disrupt services. The vulnerability affects any Linux system running a vulnerable version of GNU telnetd. Given the ease of exploitation (due to the availability of a PoC), unpatched systems are at high risk of being compromised.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the patch for CVE-2026-32746 to all affected systems immediately.\u003c/li\u003e\n\u003cli\u003eDisable telnet service if it is not required. Consider using SSH instead.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules provided in this brief to detect potential exploitation attempts.\u003c/li\u003e\n\u003cli\u003eEnable process creation logging on Linux systems to enable the provided Sigma rules.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T12:00:00Z","date_published":"2024-01-03T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-gnu-telnetd-bo/","summary":"A critical buffer overflow vulnerability exists in GNU telnetd (CVE-2026-32746), potentially allowing remote code execution on affected Linux systems.","title":"GNU telnetd Buffer Overflow Vulnerability (CVE-2026-32746)","url":"https://feed.craftedsignal.io/briefs/2024-01-gnu-telnetd-bo/"}],"language":"en","title":"CraftedSignal Threat Feed - Telnetd","version":"https://jsonfeed.org/version/1.1"}