CVE-2007-6427 in Xserver
Summary
by MITRE
The XInput extension in X.Org Xserver before 1.4.1 allows context-dependent attackers to execute arbitrary code via requests related to byte swapping and heap corruption within multiple functions, a different vulnerability than CVE-2007-4990.
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Analysis
by VulDB Data Team • 08/04/2019
The vulnerability identified as CVE-2007-6427 affects the XInput extension within X.Org Xserver versions prior to 1.4.1, representing a critical security flaw that enables context-dependent attackers to execute arbitrary code on affected systems. This vulnerability specifically targets the handling of byte swapping operations and heap corruption within multiple functions of the XInput extension, creating a pathway for remote code execution through carefully crafted requests. The flaw exists in the X.Org Xserver's processing of input device requests, particularly those involving XInput extension functionality, making it a significant concern for systems relying on graphical user interfaces and input device management.
The technical implementation of this vulnerability stems from improper handling of data structures during byte swapping operations within the XInput extension functions. When the Xserver processes requests containing malformed or specially crafted data, it fails to properly validate input parameters before performing memory operations. This leads to heap corruption that can be exploited to overwrite critical memory locations, ultimately allowing attackers to execute arbitrary code with the privileges of the Xserver process. The vulnerability is particularly dangerous because it operates at the server level, potentially providing attackers with elevated privileges and access to system resources beyond what would normally be available through standard user-level attacks.
From an operational perspective, this vulnerability poses significant risks to systems running affected X.Org Xserver versions, particularly in enterprise environments where graphical interfaces and multiple input devices are common. The context-dependent nature of the attack means that exploitation requires specific conditions to be met, typically involving network-based attacks against X11 servers that accept remote connections. Systems with X11 forwarding enabled, remote desktop implementations, or networked graphical environments are particularly vulnerable. The impact extends beyond simple code execution to potentially allow for privilege escalation, data exfiltration, and persistent access to compromised systems, making it a serious concern for security professionals managing Unix-like systems.
The vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and demonstrates characteristics consistent with the ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation may involve executing arbitrary code through the compromised Xserver process. Organizations should prioritize immediate patching of X.Org Xserver installations to version 1.4.1 or later, as this represents the most effective mitigation strategy. Additionally, implementing network segmentation to limit access to X11 servers, disabling unnecessary X11 forwarding, and monitoring for suspicious XInput extension requests can provide additional layers of defense. Security teams should also consider implementing host-based intrusion detection systems to monitor for exploitation attempts and maintain updated threat intelligence regarding similar vulnerabilities in the X.Org ecosystem.