Doubles has reported a vulnerability in UNARJ, which potentially can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to an input validation error when unpacking archives. This can be exploited via a directory traversal attack to overwrite files outside the directory, where the files are extracted to, if a user is tricked into extracting a malicious archive using UNARJ.
Successful exploitation requires that the "x" option is used to preserve paths.
The vulnerability has been confirmed in version 2.63 and has also been reported in version 2.65. Other versions may also be affected.
Solution: The vendor reports that UNARJ is just a demonstration product and should not be used on production systems.
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Subject: UNARJ Directory Traversal Vulnerability
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