TITLE:
X7 Chat "help_file" Directory Traversal Vulnerability

SECUNIA ADVISORY ID:
SA19886

VERIFY ADVISORY:
http://secunia.com/advisories/19886/

CRITICAL:
Highly critical

IMPACT:
Exposure of system information, Exposure of sensitive information,
System access

WHERE:
>From remote

SOFTWARE:
X7 Chat 2.x
http://secunia.com/product/9696/

DESCRIPTION:
rgod has discovered a vulnerability in X7 Chat, which can be
exploited by malicious people to disclose sensitive information and
by malicious users to compromise a vulnerable system.

Input passed to the "help_file" parameter in help/index.php is not
properly verified before being used to include files. This can be
exploited to access arbitrary files via directory traversal attacks.

Via this vulnerability it is also possible to execute arbitrary PHP
code by accessing avatar images with malicious EXIF data.

Successful exploitation requires a valid user with permission to
upload avatar images.

The vulnerability has been confirmed in version 2.0.0. Other versions
may also be affected.

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

Disable upload of avatar images.

PROVIDED AND/OR DISCOVERED BY:
rgod

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/1738

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