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CGIHTML Insecure Form-Data Temporary File Vulnerability
When handling uploaded form-data, cgihtml creates a temporary file to store this data in /tmp or another user-specified directory. A client supplied filename is used when the temporary file is created. A local attacker may take advantage of this condition to create a symbolic link in place of the temporary file, which points to another file on the system which is writeable by a server process which utilizes the vulnerable routines. The attacker may then submit a malicious form-data upload, using the attacker-supplied filename, and cause local files to be corrupted. |
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