{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/rgui/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.4,"id":"CVE-2018-25258"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["buffer-overflow","dep-bypass","rgui","cve-2018-25258","windows"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eRGui 3.5.0, a component of the R programming language distribution for Windows, is vulnerable to a local buffer overflow in its GUI preferences dialog. This vulnerability, identified as CVE-2018-25258, allows an attacker with local access to bypass Data Execution Prevention (DEP) and execute arbitrary code. The attack involves crafting malicious input to the \u0026ldquo;Language for menus and messages\u0026rdquo; field within the GUI preferences, triggering a stack-based buffer overflow. This overflow overwrites the Structured Exception Handler (SEH) record, enabling the attacker to redirect execution flow and execute a Return-Oriented Programming (ROP) chain. The ROP chain is then used to allocate memory using VirtualAlloc and ultimately execute arbitrary code. This vulnerability impacts systems running the affected version of RGui.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker gains local access to a Windows system running RGui 3.5.0.\u003c/li\u003e\n\u003cli\u003eThe attacker opens the GUI preferences dialog within RGui.\u003c/li\u003e\n\u003cli\u003eThe attacker inputs a specially crafted string into the \u0026ldquo;Language for menus and messages\u0026rdquo; field. This string is designed to overflow the buffer on the stack.\u003c/li\u003e\n\u003cli\u003eThe buffer overflow overwrites the SEH record, replacing the legitimate handler address with the address of a ROP chain.\u003c/li\u003e\n\u003cli\u003eAn exception occurs due to the overflow, triggering the SEH.\u003c/li\u003e\n\u003cli\u003eInstead of the legitimate exception handler, the attacker\u0026rsquo;s ROP chain is executed.\u003c/li\u003e\n\u003cli\u003eThe ROP chain calls VirtualAlloc to allocate a region of memory with execute permissions.\u003c/li\u003e\n\u003cli\u003eThe attacker copies malicious code into the newly allocated memory and transfers control to it, achieving 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 an attacker to execute arbitrary code with the privileges of the user running RGui. This could lead to the installation of malware, data theft, or complete system compromise. While the vulnerability requires local access, it represents a significant risk to systems where untrusted users have access to RGui. The vulnerability affects RGui version 3.5.0.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade to a later version of RGui that addresses the CVE-2018-25258 vulnerability if available.\u003c/li\u003e\n\u003cli\u003eMonitor process creations for \u003ccode\u003ergui.exe\u003c/code\u003e spawning unusual child processes or making unexpected network connections, using a process creation log source.\u003c/li\u003e\n\u003cli\u003eImplement application whitelisting to prevent the execution of unauthorized programs.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule for detecting potential ROP chain execution to identify exploitation attempts.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-12T13:16:31Z","date_published":"2026-04-12T13:16:31Z","id":"/briefs/2026-04-rgui-buffer-overflow/","summary":"RGui 3.5.0 contains a local buffer overflow vulnerability in the GUI preferences dialog that allows attackers to bypass DEP protections through structured exception handling exploitation, leading to arbitrary code execution.","title":"RGui 3.5.0 Local Buffer Overflow Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-04-rgui-buffer-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Rgui","version":"https://jsonfeed.org/version/1.1"}