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A new version (0.9.0.0 - Release Candidate 1) of the free Secunia PSI
has been released. The new version includes many new and advanced
features, which makes it even easier to stay patched.

Download and test it today:
https://psi.secunia.com/

Read more about this new version:
https://psi.secunia.com/?page=changelog

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TITLE:
WordPress MU File Upload and Security Bypass

SECUNIA ADVISORY ID:
SA28789

VERIFY ADVISORY:
http://secunia.com/advisories/28789/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, System access

WHERE:
>From remote

SOFTWARE:
WordPress MU 1.x
http://secunia.com/product/14628/

DESCRIPTION:
Alexander Concha has reported a vulnerability in WordPress MU, which
can be exploited by malicious users to bypass certain security
restrictions and to compromise a vulnerable system.

The wp-admin/options.php script does not properly restrict changes to
options. This can be exploited to e.g. upload and execute arbitrary
PHP code.

Successful exploitation requires valid user credentials and having
"manage_options" capabilities. Successful exploitation for file
uploading also requires "upload_files" capabilities.

The vulnerability is reported in version 1.3.1. Prior versions may
also be affected.

SOLUTION:
Update to version 1.3.2 or later.

PROVIDED AND/OR DISCOVERED BY:
Alexander Concha

ORIGINAL ADVISORY:
WordPress MU:
http://mu.wordpress.org/forums/topic.php?id=7534&page&replies=1

Alexander Concha:
http://www.buayacorp.com/files/wordpress/wordpress-mu-options-overwrite.html

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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.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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