CVE-2008-2841 in XChat
Summary
by MITRE
Argument injection vulnerability in XChat 2.8.7b and earlier on Windows, when Internet Explorer is used, allows remote attackers to execute arbitrary commands via the --command parameter in an ircs:// URI.
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Analysis
by VulDB Data Team • 10/28/2024
The vulnerability identified as CVE-2008-2841 represents a critical argument injection flaw affecting XChat version 2.8.7b and earlier installations on Windows operating systems. This vulnerability specifically manifests when XChat processes ircs:// URIs through Internet Explorer, creating a dangerous execution path that adversaries can exploit to gain unauthorized system access. The flaw stems from insufficient input validation and sanitization within the application's handling of command-line arguments, particularly when processing the --command parameter embedded within malicious URIs.
The technical exploitation of this vulnerability occurs through a combination of URI parsing and command execution mechanisms. When a user clicks on a specially crafted ircs:// URI containing malicious --command parameters, XChat fails to properly sanitize or validate these inputs before passing them to underlying system commands. This inadequate input filtering creates a direct path for command injection attacks, allowing remote attackers to execute arbitrary code with the privileges of the affected user. The vulnerability is particularly dangerous because it leverages the trusted relationship between Internet Explorer and the XChat application, making exploitation more likely through social engineering attacks that trick users into clicking malicious links.
The operational impact of this vulnerability extends beyond simple command execution, as it can enable full system compromise and persistent access. Attackers can leverage this vulnerability to install backdoors, exfiltrate sensitive data, or establish command and control channels. The Windows-specific nature of this flaw means that the attack surface is limited to systems running both XChat and Internet Explorer, but the potential for widespread exploitation remains high due to the prevalence of both applications in enterprise and personal environments. The vulnerability also demonstrates poor security practices in application design, particularly in how command-line parameters are handled and validated.
Security professionals should implement multiple layers of mitigation for this vulnerability, including immediate patching of affected XChat installations to versions that properly sanitize command-line inputs. Network administrators should consider implementing URI filtering rules at the firewall or proxy level to block suspicious ircs:// URIs, particularly those containing command injection patterns. The vulnerability aligns with CWE-77, which describes improper neutralization of special elements used in command execution contexts, and maps to ATT&CK technique T1059.001 for command and scripting interpreter. Organizations should also conduct security awareness training to help users recognize potentially malicious links, and implement application whitelisting policies that restrict execution of untrusted URI handlers. Additionally, system monitoring should be enhanced to detect suspicious command execution patterns that may indicate exploitation attempts.