CVE-2008-3883 in Caudium
Summary
by MITRE
configvar in Caudium 1.4.12 allows local users to overwrite arbitrary files via a symlink attack on a /tmp/roken#####.pike temporary file.
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Analysis
by VulDB Data Team • 10/08/2018
The vulnerability described in CVE-2008-3883 affects Caudium 1.4.12, a web server application that processes configuration variables through a component called configvar. This flaw represents a classic insecure temporary file handling issue that enables local privilege escalation and arbitrary file overwrite attacks. The vulnerability specifically manifests when the application creates temporary files in the /tmp directory using a predictable naming pattern with the prefix roken followed by numeric characters. The core technical flaw lies in the application's failure to properly validate or secure temporary file creation processes, creating a window of opportunity for malicious users to exploit symbolic link attacks.
The operational impact of this vulnerability is significant as it allows local attackers to manipulate the system's file structure by creating malicious symbolic links that point to critical system files. When Caudium attempts to write to the temporary file, the system follows the symbolic link and overwrites the target file with attacker-controlled content. This attack vector is particularly dangerous because it can be used to overwrite system configuration files, binaries, or other critical resources, potentially leading to privilege escalation or complete system compromise. The vulnerability directly relates to CWE-362, which describes concurrent execution using shared resource vulnerabilities, and CWE-377, which addresses insecure temporary files. The attack pattern aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as well as T1548.001 for abuse of system permissions, since successful exploitation would likely require elevated privileges to create symbolic links and modify system files.
Mitigation strategies for this vulnerability must address both the immediate temporary file handling issue and broader system security practices. The most effective immediate solution involves modifying the application to use secure temporary file creation methods such as mkstemp or similar functions that ensure atomic creation of temporary files with proper permissions. System administrators should implement proper file system permissions and access controls, particularly for the /tmp directory, ensuring that temporary files are created with restrictive permissions and that symbolic link creation is properly restricted. Additionally, the application should be updated to a newer version that addresses this specific vulnerability, as Caudium 1.4.12 is an outdated version with known security issues. Organizations should also implement monitoring and logging for suspicious file system activities, particularly around temporary file creation and modification, to detect potential exploitation attempts. Regular security audits and vulnerability assessments should include checks for similar insecure temporary file patterns across all system components, as this vulnerability type remains prevalent in legacy applications and can be exploited in various contexts beyond the specific Caudium implementation. The remediation process should also include system hardening measures such as disabling unnecessary symbolic link creation capabilities and implementing proper file system integrity monitoring to prevent similar vulnerabilities from being exploited in other applications.