Vulnerability Note VU#764027

zml.cgi does not adequately validate user input thereby allowing directory traversal

Overview

zml.cgi does not adequately validate user input, allowing for directory traversal out of the web root directory.

I. Description

The perl script zml.cgi reads and parses a file on the server, executing certain Server Side Include (SSI) directives found in the file. The script accepts a CGI parameter specifying the file that should be read and parsed. The script does not adequately validate this parameter, allowing for directory traversal out of the web root directory.

II. Impact

Attackers may read any file readable by the web server process.

III. Solution

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

Systems Affected

Vendor	Status	Date Notified	Date Updated
Abe Timmerman	Vulnerable	24-Sep-2002

References

http://www.jero.cc/zml/zml.html
http://www.securityfocus.com/bid/3759

Credit

Thanks to Blackshell Security Advisory for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

Date Public:	2001-12-31
Date First Published:	2002-09-26
Date Last Updated:	2002-09-26
CERT Advisory:
CVE-ID(s):
NVD-ID(s):
US-CERT Technical Alerts:
Metric:	1.71
Document Revision:	6

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