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TITLE:
GNUBoard "g4_path" File Inclusion Vulnerability

SECUNIA ADVISORY ID:
SA33564

VERIFY ADVISORY:
http://secunia.com/advisories/33564/

CRITICAL:
Highly critical

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

WHERE:
>From remote

SOFTWARE:
GNUBoard 4.x
http://secunia.com/advisories/product/20997/

DESCRIPTION:
flyh4t has discovered a vulnerability in GNUBoard, which can be
exploited by malicious people to disclose sensitive information or
compromise a vulnerable system.

Input passed to the "g4_path" parameter in common.php is not properly
verified before being used to include files. This can be exploited to
include arbitrary files from local resources or to execute arbitrary
PHP code via "data:" URIs.

Successful exploitation requires that "register_globals" is enabled.
Successful execution of arbitrary PHP code requires that
"allow_url_include" is enabled.

The vulnerability is confirmed in version 4.31.03. Other versions may
also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
flyh4t, Wolves Security Team

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/7792

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