phpCAS CAS Proxy Mode Cross-Site Scripting Vulnerability

Bugtraq ID:	42160
Class:	Input Validation Error
CVE:	CVE-2010-2796
Remote:	Yes
Local:	No
Published:	Aug 03 2010 12:00AM
Updated:	Apr 13 2015 10:14PM
Credit:	Joachim Fritschi
Vulnerable:	Jasig phpCAS 1.1.1 Jasig phpCAS 1.1 RC7 Jasig phpCAS 1.1 Debian Linux 5.0 sparc Debian Linux 5.0 s/390 Debian Linux 5.0 powerpc Debian Linux 5.0 mipsel Debian Linux 5.0 mips Debian Linux 5.0 m68k Debian Linux 5.0 ia-64 Debian Linux 5.0 ia-32 Debian Linux 5.0 hppa Debian Linux 5.0 armel Debian Linux 5.0 arm Debian Linux 5.0 amd64 Debian Linux 5.0 alpha Debian Linux 5.0
Not Vulnerable:	Jasig phpCAS 1.1.2

phpCAS CAS Proxy Mode Cross-Site Scripting Vulnerability

phpCAS is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may help the attacker steal cookie-based authentication credentials and launch other attacks.

Versions prior to phpCAS 1.1.2 are vulnerable.

phpCAS CAS Proxy Mode Cross-Site Scripting Vulnerability

An attacker can exploit this issue by enticing an unsuspecting user to follow a malicious URI.

phpCAS CAS Proxy Mode Cross-Site Scripting Vulnerability

Solution:
Updates are available. Please see the references for more information.

phpCAS CAS Proxy Mode Cross-Site Scripting Vulnerability

References:

• phpCAS Homepage (Jasig)
  
• The callbackurl in proxymode should be used urlencoded when generating urls. (phpCAS)