TITLE:
ACal "ACalAuthenticate" Authentication Bypass Vulnerability

SECUNIA ADVISORY ID:
SA18432

VERIFY ADVISORY:
http://secunia.com/advisories/18432/

CRITICAL:
Highly critical

IMPACT:
Security Bypass, System access

WHERE:
>From remote

SOFTWARE:
ACal 2.x
http://secunia.com/product/3884/

DESCRIPTION:
Aliaksandr Hartsuyeu has discovered a vulnerability in ACal, which
can be exploited by malicious people to bypass certain security
restrictions and compromise a vulnerable system.

The vulnerability is caused due to an insecure authentication
process. This can be exploited to access the administration section
by setting the "ACalAuthenticate" cookie parameter to "inside".

This can further be exploited to inject and execute arbitrary PHP
code by manipulating the header and footer files.

The vulnerability has been confirmed in version 2.2.5. Other versions
may also be affected.

SOLUTION:
Restrict access to the administration section (e.g. with a .htaccess
file).

PROVIDED AND/OR DISCOVERED BY:
Aliaksandr Hartsuyeu

ORIGINAL ADVISORY:
http://evuln.com/vulns/25/summary.html

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