CVE-2015-0853 in svn-workbench
Summary
by MITRE
svn-workbench 1.6.2 and earlier on a system with xeyes installed allows local users to execute arbitrary commands by using the "Command Shell" menu item while in the directory trunk/$(xeyes).
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Analysis
by VulDB Data Team • 11/13/2019
The vulnerability identified as CVE-2015-0853 represents a command injection flaw in svn-workbench version 1.6.2 and earlier, specifically when the application is running on systems that have xeyes installed. This issue arises from improper input validation and command execution handling within the application's interface, creating a path for local privilege escalation through malicious command injection. The vulnerability is particularly concerning because it leverages a common graphical utility like xeyes to execute arbitrary code, making it both accessible and potentially dangerous in environments where such tools are present.
The technical flaw manifests when users navigate to the trunk/ directory and attempt to execute commands through the "Command Shell" menu item while the directory path contains the command substitution syntax $(xeyes). This design flaw allows the application to interpret and execute the xeyes command as part of the shell command, effectively bypassing normal security controls. The vulnerability stems from the application's failure to properly sanitize user input or directory names that may contain shell metacharacters, creating an environment where command injection can occur. This type of vulnerability is classified under CWE-78 as improper neutralization of special elements used in OS commands, which directly relates to the exploitation method used in this case.
The operational impact of CVE-2015-0853 is significant for local users who have access to the affected system, as it provides a means to execute arbitrary commands with the privileges of the user running svn-workbench. This could potentially allow attackers to escalate privileges, access sensitive data, or compromise the entire system. The vulnerability is particularly dangerous because it requires minimal user interaction to exploit, as the malicious command substitution is embedded within the directory path itself. Attackers could potentially craft directory names that contain multiple commands or even reverse shell payloads, making this a versatile vector for system compromise.
The exploitation of this vulnerability aligns with techniques described in the ATT&CK framework under the T1059.001 technique for command and scripting interpreter, specifically focusing on the use of shell commands for execution. Additionally, the vulnerability demonstrates characteristics of T1068 for exploit for privilege escalation, as local users can leverage this flaw to gain elevated system access. Organizations should consider implementing input validation and command sanitization measures to prevent such issues, particularly in applications that handle user-provided directory names or paths. The vulnerability also highlights the importance of secure coding practices and the need for proper shell command construction that prevents injection attacks, as outlined in various security standards including OWASP Top Ten and NIST guidelines for secure software development.
Mitigation strategies for CVE-2015-0853 include immediate patching of svn-workbench to versions that address the command injection vulnerability, implementing proper input validation for directory names, and restricting access to potentially dangerous commands within the application. System administrators should also consider disabling or removing xeyes and similar utilities from production systems unless absolutely necessary, as these tools can be leveraged for command injection attacks. Additionally, organizations should implement application whitelisting and sandboxing techniques to limit the potential impact of such vulnerabilities, ensuring that even if exploitation occurs, the damage remains contained within restricted boundaries. Regular security assessments and code reviews focusing on shell command construction and input validation can help prevent similar vulnerabilities from being introduced in future software versions.