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Vigil@nce: CUPS, Cross Site Scripting via kerberos

November 2009 by Vigil@nce

An attacker can use the kerberos parameter, in order to generate a
Cross Site Scripting in the CUPS administration web site.

 Severity: 2/4
 Consequences: client access/rights
 Provenance: document
 Means of attack: 1 attack
 Ability of attacker: technician (2/4)
 Confidence: confirmed by the editor (5/5)
 Diffusion of the vulnerable configuration: high (3/3)
 Creation date: 10/11/2009

IMPACTED PRODUCTS

 Debian Linux
 OpenSolaris
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The CUPS (Common UNIX Printing System) product provides printers
management under Unix. It can be reached via a web site listening
on the port 631/tcp.

A url can contain the same parameter twice. For example:
http://server/page?parameter=value1&parameter=value2
However, the "admin" page of the CUPS web site does not correctly
handle the case where the "kerberos" parameter is used twice. An
attacker can therefore generate a Cross Site Scripting.

An attacker can thus use the kerberos parameter, in order to
generate a Cross Site Scripting in the CUPS administration web
site.

CHARACTERISTICS

 Identifiers: 271169, 6893187, BID-36958, CVE-2009-2820, DSA
1933-1, STR #3367, VIGILANCE-VUL-9182
 Url: http://vigilance.fr/vulnerability/CUPS-Cross-Site-Scripting-via-kerberos-9182


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