CVE-2014-8098 in XFree86
Summary
by MITRE
The GLX extension in XFree86 4.0, X.Org X Window System (aka X11 or X) X11R6.7, and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to cause a denial of service (out-of-bounds read or write) or possibly execute arbitrary code via a crafted length or index value to the (1) __glXDisp_Render, (2) __glXDisp_RenderLarge, (3) __glXDispSwap_VendorPrivate, (4) __glXDispSwap_VendorPrivateWithReply, (5) set_client_info, (6) __glXDispSwap_SetClientInfoARB, (7) DoSwapInterval, (8) DoGetProgramString, (9) DoGetString, (10) __glXDispSwap_RenderMode, (11) __glXDisp_GetCompressedTexImage, (12) __glXDispSwap_GetCompressedTexImage, (13) __glXDisp_FeedbackBuffer, (14) __glXDispSwap_FeedbackBuffer, (15) __glXDisp_SelectBuffer, (16) __glXDispSwap_SelectBuffer, (17) __glXDisp_Flush, (18) __glXDispSwap_Flush, (19) __glXDisp_Finish, (20) __glXDispSwap_Finish, (21) __glXDisp_ReadPixels, (22) __glXDispSwap_ReadPixels, (23) __glXDisp_GetTexImage, (24) __glXDispSwap_GetTexImage, (25) __glXDisp_GetPolygonStipple, (26) __glXDispSwap_GetPolygonStipple, (27) __glXDisp_GetSeparableFilter, (28) __glXDisp_GetSeparableFilterEXT, (29) __glXDisp_GetConvolutionFilter, (30) __glXDisp_GetConvolutionFilterEXT, (31) __glXDisp_GetHistogram, (32) __glXDisp_GetHistogramEXT, (33) __glXDisp_GetMinmax, (34) __glXDisp_GetMinmaxEXT, (35) __glXDisp_GetColorTable, (36) __glXDisp_GetColorTableSGI, (37) GetSeparableFilter, (38) GetConvolutionFilter, (39) GetHistogram, (40) GetMinmax, or (41) GetColorTable function.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/29/2025
The vulnerability described in CVE-2014-8098 represents a critical security flaw within the GLX (OpenGL Extension to the X Window System) implementation across multiple versions of XFree86 and X.Org Server. This issue affects the core graphics subsystem that enables OpenGL rendering within X11 environments, making it a significant concern for systems that rely on graphical processing capabilities. The vulnerability manifests through improper validation of input parameters in various GLX dispatch functions, creating opportunities for malicious actors to exploit memory access violations. The affected functions span across a comprehensive range of OpenGL operations including rendering, texture handling, buffer management, and pixel data operations, indicating a systemic flaw in the input validation mechanisms.
The technical nature of this vulnerability stems from insufficient bounds checking and input sanitization within the GLX extension's dispatch handlers. When remote authenticated users submit crafted length or index values to any of the specified functions, the system performs out-of-bounds reads or writes that can corrupt memory structures or potentially allow arbitrary code execution. This type of vulnerability falls under the Common Weakness Enumeration category of CWE-125, which describes out-of-bounds read conditions, and may also involve CWE-787 for out-of-bounds write operations. The exploitation occurs through the X11 protocol's GLX extension mechanisms, where client applications communicate with the X server to perform graphics operations, making it a prime target for privilege escalation attacks.
The operational impact of this vulnerability extends beyond simple denial of service scenarios to potentially enable full system compromise. Remote authenticated attackers who can establish connections to the X server can leverage these flaws to execute arbitrary code with the privileges of the X server process, which typically runs with elevated permissions. This creates a serious risk for multi-user systems, servers, and desktop environments where X11 is actively used for graphics rendering. The vulnerability affects a broad spectrum of systems including Linux distributions, Unix-like systems, and any platform relying on X.Org Server versions prior to 1.16.3, making it particularly dangerous in enterprise environments where centralized graphics services are common.
Mitigation strategies for CVE-2014-8098 require immediate patching of affected X.Org Server installations to version 1.16.3 or later, which contains the necessary fixes for the input validation issues. System administrators should also implement network segmentation to limit access to X11 servers, particularly in environments where remote access is not strictly required. Additional protective measures include disabling unnecessary GLX extensions, implementing strict access controls for X11 connections, and monitoring for anomalous X11 protocol behavior that might indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation through memory corruption and remote code execution, with potential use of T1068 for local privilege escalation and T1105 for command and control communications. Organizations should also consider implementing intrusion detection systems that can identify suspicious X11 protocol patterns and maintain updated security patches across all graphics-related components.