CVE-2008-6936 in Exodus
Summary
by MITRE
Argument injection vulnerability in Exodus 0.10 allows remote attackers to inject arbitrary command line arguments, overwrite arbitrary files, and cause a denial of service via encoded spaces in a pres:// URI, a different vector than CVE-2008-6935.
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Analysis
by VulDB Data Team • 11/11/2024
The CVE-2008-6936 vulnerability represents a critical argument injection flaw within the Exodus 0.10 web browser application that demonstrates the dangerous consequences of improper input validation in URI parsing mechanisms. This vulnerability specifically targets the pres:// URI scheme implementation where encoded spaces in the URI can be exploited to inject malicious command line arguments into the application's processing pipeline. The flaw operates through a sophisticated attack vector that leverages the way the application handles URI encoding and argument parsing, creating a pathway for remote attackers to execute arbitrary commands on the affected system. The vulnerability's classification as an argument injection issue aligns with CWE-77, which specifically addresses command injection vulnerabilities where attacker-controlled data is inserted into command execution contexts without proper sanitization.
The technical exploitation of this vulnerability occurs when the Exodus browser encounters a pres:// URI containing encoded spaces that are not properly decoded or validated before being processed as command line arguments. Attackers can craft malicious URIs where the encoded space characters (typically %20) are manipulated to break out of intended argument boundaries and inject additional command line parameters. This allows for arbitrary file overwrites through carefully constructed URI sequences that can target the application's file handling mechanisms, potentially leading to privilege escalation or complete system compromise. The vulnerability's impact extends beyond simple command execution as it can also be leveraged to cause denial of service conditions by injecting arguments that disrupt normal application operation or cause memory corruption.
The operational implications of CVE-2008-6936 are severe for organizations relying on Exodus 0.10 as their primary browser solution, as this vulnerability provides attackers with multiple attack vectors including remote code execution, file system manipulation, and service disruption. The fact that this vulnerability operates through a different vector than CVE-2008-6935 demonstrates the complexity of URI-based attack surfaces and the need for comprehensive input validation across all URI schemes handled by the application. The encoded space exploitation technique represents a sophisticated approach that bypasses basic input filtering mechanisms and exploits the fundamental parsing behavior of the application's URI handler. This vulnerability also maps to ATT&CK technique T1059.007 for command and scripting interpreter, specifically targeting the application's command line argument processing capabilities.
Security professionals should implement immediate mitigations including input validation for all URI schemes, particularly those that may be processed by external applications or system commands. The recommended approach involves sanitizing and properly decoding URI components before any argument processing occurs, ensuring that encoded characters are handled appropriately to prevent injection attacks. Organizations should also consider implementing network-level controls to restrict access to potentially vulnerable URI schemes and monitor for suspicious URI patterns in network traffic. The vulnerability underscores the importance of following secure coding practices as outlined in OWASP Top Ten and other security standards, particularly focusing on input validation and proper argument handling in applications that process external data. Additionally, system administrators should ensure that all browser applications are kept up to date with security patches and that legacy applications like Exodus 0.10 are either updated or removed from production environments to prevent exploitation of known vulnerabilities.