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TITLE:
PaoLink/PaoBacheca/PaoLiber Authentication Bypass Vulnerability

SECUNIA ADVISORY ID:
SA36023

VERIFY ADVISORY:
http://secunia.com/advisories/36023/

DESCRIPTION:
SirGod has discovered a vulnerability in PaoLink, PaoBacheca, and
PaoLiber, which can be exploited by malicious people to bypass
certain security restrictions.

The vulnerability is caused due to the use of an uninitialised
variable in login.php, which can be exploited to access the
administrative section by passing an arbitrary value (not 0) via the
"login_ok" parameter to login.php.

Successful exploitation requires that "register_globals" is enabled.

The vulnerability is confirmed in the following products and
versions:
* PaoLink version 1.0
* PaoBacheca version 2.1
* PaoLiber version 1.1

Other versions may also be affected.

SOLUTION:
Edit the source code to ensure that "$login_ok" is properly
initialised.

Set "register_globals" to "Off".

PROVIDED AND/OR DISCOVERED BY:
SirGod

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/9292
http://milw0rm.com/exploits/9293
http://milw0rm.com/exploits/9294

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Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


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