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CERT Coordination Center does not adequately validate user input thereby allowing arbitrary command execution

Vulnerability Note VU#453475

Original Release Date: 2002-09-27 | Last Revised: 2003-04-15

Overview does not adequately filter user input, allowing arbitrary command execution.

Description is an adaptation of the CGI script, enhanced to use PGP encryption. does not adequately filter the "recipient" and "pgpuserid" CGI variables before passing them to piped Perl open() function calls, inevoking shells. As a result, attackers may execute arbitrary commands on the server with privileges of the web server process.


Remote attackers can execute arbitrary commands on the server with privileges of the web server process.


The CERT/CC is currently unaware of a practical solution to this problem.

Vendor Information

Affected   Unknown   Unaffected

Ventura Blvd

Updated:  September 25, 2002



Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A



Thanks to John Scimone for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

CVE IDs: None
Severity Metric: 4.28
Date Public: 2001-11-29
Date First Published: 2002-09-27
Date Last Updated: 2003-04-15 14:29 UTC
Document Revision: 6

Sponsored by CISA.