{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2019-25656/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.4,"id":"CVE-2019-25656"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["buffer-overflow","seh-overwrite","code-execution","cve-2019-25656","windows"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eR i386 version 3.5.0 contains a local buffer overflow vulnerability, identified as CVE-2019-25656, within the GUI Preferences dialog. This vulnerability allows a local attacker to achieve arbitrary code execution by exploiting a buffer overflow when the application processes user-supplied input in the \u0026lsquo;Language for menus and messages\u0026rsquo; field. By crafting a malicious payload string, an attacker can overwrite the Structured Exception Handler (SEH) records. Successful exploitation would allow attackers to execute arbitrary code with the privileges of the user running the application. This poses a significant risk to systems running this vulnerable version of R, potentially leading to complete system compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains local access to a Windows system running R i386 3.5.0.\u003c/li\u003e\n\u003cli\u003eAttacker opens the R application.\u003c/li\u003e\n\u003cli\u003eAttacker navigates to the GUI Preferences dialog within the R application.\u003c/li\u003e\n\u003cli\u003eAttacker identifies the \u0026lsquo;Language for menus and messages\u0026rsquo; field within the GUI Preferences.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious payload string designed to overwrite SEH records, including shellcode for arbitrary code execution.\u003c/li\u003e\n\u003cli\u003eAttacker inputs the malicious string into the \u0026lsquo;Language for menus and messages\u0026rsquo; field.\u003c/li\u003e\n\u003cli\u003eThe R application attempts to process the attacker-supplied string without proper bounds checking, triggering the buffer overflow.\u003c/li\u003e\n\u003cli\u003eThe crafted payload overwrites the SEH record, redirecting execution flow to the attacker-controlled shellcode, resulting in arbitrary code execution.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability allows a local attacker to execute arbitrary code on the targeted system. The impact includes potential privilege escalation, allowing the attacker to perform actions with the same privileges as the user running the R application. This could lead to the installation of malware, data exfiltration, or complete system compromise. While specific victim numbers are not available, any system running the vulnerable R i386 3.5.0 is at risk.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade R to a version higher than 3.5.0 to patch CVE-2019-25656.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule to detect the execution of R with a modified command line containing long strings to identify potential exploit attempts.\u003c/li\u003e\n\u003cli\u003eMonitor network connections originating from R processes for suspicious outbound traffic using network connection logs.\u003c/li\u003e\n\u003cli\u003eImplement the Sigma rule to detect abnormal process execution originating from the R application to catch potential exploitation attempts.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-05T21:16:42Z","date_published":"2026-04-05T21:16:42Z","id":"/briefs/2026-04-r-buffer-overflow/","summary":"R i386 version 3.5.0 is susceptible to a local buffer overflow in the GUI Preferences dialog, allowing a local attacker to overwrite the structured exception handler (SEH) by supplying a malicious string to the 'Language for menus and messages' field, leading to arbitrary code execution.","title":"R i386 3.5.0 Local Buffer Overflow Vulnerability (CVE-2019-25656)","url":"https://feed.craftedsignal.io/briefs/2026-04-r-buffer-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2019-25656","version":"https://jsonfeed.org/version/1.1"}