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TITLE:
WebCalendar "includedir" Parameter Arbitrary Setting File Loading

SECUNIA ADVISORY ID:
SA20367

VERIFY ADVISORY:
http://secunia.com/advisories/20367/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, Exposure of sensitive information

WHERE:
>From remote

SOFTWARE:
WebCalendar 1.x
http://secunia.com/product/5606/

DESCRIPTION:
socsam has discovered a vulnerability in WebCalendar, which can be
exploited by malicious people to bypass certain security restrictions
and disclose sensitive information.

Input passed to the "includedir" parameter isn't properly verified,
before it is used in an "fopen()" call. This can be exploited to load
an arbitrary setting file from an external web site.

This can further be exploited to disclose the content of arbitrary
files by defining the "user_inc" variable in a malicious setting
file.

Successful exploitation requires that "register_globals" is enabled.

The vulnerability has been confirmed in version 1.0.3. Other versions
may also be affected.

SOLUTION:
Edit the source code to ensure that input is properly verified.

Set "register_globals" to "Off".

PROVIDED AND/OR DISCOVERED BY:
socsam

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