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TITLE:
Discuz! Multiple File Extensions Script Upload Vulnerability

SECUNIA ADVISORY ID:
SA16433

VERIFY ADVISORY:
http://secunia.com/advisories/16433/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Crossday Discuz! Board 2.x
http://secunia.com/product/2979/
Crossday Discuz! Board 3.x
http://secunia.com/product/2980/
Crossday Discuz! Board 4.x
http://secunia.com/product/5546/

DESCRIPTION:
Jeremy Bae has reported a vulnerability in Discuz!, which potentially
can be exploited by malicious people to compromise a vulnerable
system.

The vulnerability is caused due to an error in the handling of file
uploads where a filename has multiple file extensions. This can be
exploited to upload malicious script files inside the web root.

Successful exploitation may allow execution of script code, but
requires permissions to upload file attachments and knowledge of the
filename used to save the uploaded attachment.

The vulnerability has been reported in versions 4.0.0 rc4 and prior.

SOLUTION:
Allow only trusted users to upload file attachments.

PROVIDED AND/OR DISCOVERED BY:
Jeremy Bae, STG Security.

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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http://secunia.com/about_secunia_advisories/


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