TITLE:
ar-blog Script Insertion and Authentication Bypass Vulnerabilities

SECUNIA ADVISORY ID:
SA17307

VERIFY ADVISORY:
http://secunia.com/advisories/17307/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
ar-blog 5.x
http://secunia.com/product/5979/

DESCRIPTION:
_MoHaJaLi_ has reported two vulnerabilities in ar-blog, which can be
exploited by malicious people to conduct script insertion attacks and
bypass certain security restrictions.

1) Input passed when adding a comment isn't properly sanitised before
being used. This can be exploited to inject arbitrary HTML and script
code, which will be executed in a user's browser session in context
of an affected site when the malicious comment is viewed.

2) An error caused due to an insecure authentication process can be
exploited to bypass the authentication process and access the
administration section by defining certain cookie parameters.

The vulnerabilities have been reported in version 5.2 and prior.

SOLUTION:
Edit the source code to ensure that input is properly sanitised and
that administrators are properly authenticated.

PROVIDED AND/OR DISCOVERED BY:
_MoHaJaLi_

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