A vulnerability, which was classified as critical, has been found in David Bagley xlock 4.16/4.16.1. This issue affects an unknown functionality of the file xlockmore/xlockf. The manipulation of the argument -d with an unknown input leads to a format string vulnerability. Using CWE to declare the problem leads to CWE-134. The product uses a function that accepts a format string as an argument, but the format string originates from an external source. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

xlockmore and xlockf do not properly cleanse user-injected format strings, which allows local users to gain root privileges via the -d option.

The weakness was published 10/20/2000 (Website). The advisory is shared at securityfocus.com. The identification of this vulnerability is CVE-2000-0763. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known.

A public exploit has been developed in ANSI C. The exploit is available at securityfocus.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• David Bagley

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• xlock

Version

• 4.16
• 4.16.1

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CPE 2.2info

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