CVE-2006-7236 in xterm
Summary
by MITRE
The default configuration of xterm on Debian GNU/Linux sid and possibly Ubuntu enables the allowWindowOps resource, which allows user-assisted attackers to execute arbitrary code or have unspecified other impact via escape sequences.
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Analysis
by VulDB Data Team • 03/14/2025
The vulnerability described in CVE-2006-7236 represents a critical security flaw in the default configuration of xterm terminal emulator on Debian GNU/Linux sid and Ubuntu systems. This issue stems from the improper default enabling of the allowWindowOps resource, which creates a dangerous attack surface that can be exploited by malicious actors. The xterm terminal emulator, being one of the most widely used terminal applications in Unix-like systems, serves as a fundamental component for user interaction with command-line interfaces, making this vulnerability particularly concerning for system administrators and security professionals.
The technical flaw manifests through the allowWindowOps resource being enabled by default in xterm configurations, which permits the execution of escape sequences that can manipulate window operations and potentially execute arbitrary code on the target system. This configuration allows attackers to craft specially crafted escape sequences that can be interpreted by xterm to perform unauthorized operations, including command execution with the privileges of the user running the terminal. The vulnerability is classified as user-assisted, meaning that an attacker must somehow convince a user to open a malicious terminal session or interact with a crafted escape sequence, but the attack vector remains highly exploitable given the widespread use of xterm.
The operational impact of this vulnerability extends beyond simple code execution, as it can potentially lead to complete system compromise when attackers leverage the ability to execute arbitrary commands with the privileges of the terminal user. The unspecified other impacts mentioned in the description suggest that the vulnerability may also enable privilege escalation, information disclosure, or other security breaches that could compromise the integrity and confidentiality of the affected systems. This type of vulnerability particularly affects desktop environments where users frequently interact with terminal applications and may not be aware of the security implications of escape sequences.
From a security framework perspective, this vulnerability maps directly to CWE-200 (Information Exposure) and CWE-78 (Improper Neutralization of Special Elements used in an OS Command) as well as ATT&CK techniques involving privilege escalation and command execution. The default configuration issue aligns with ATT&CK tactic TA0004 (Privilege Escalation) and technique T1068 (Exploitation for Privilege Escalation). System administrators should immediately disable the allowWindowOps resource in xterm configurations or update to patched versions that address this default configuration issue. The recommended mitigation involves modifying the xterm resource files to explicitly disable window operations or implementing security policies that restrict the execution of potentially malicious escape sequences in terminal environments.