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TITLE:
PHP-Update blog.php Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA23407

VERIFY ADVISORY:
http://secunia.com/advisories/23407/

CRITICAL:
Highly critical

IMPACT:
Security Bypass, Manipulation of data, System access

WHERE:
>From remote

SOFTWARE:
PHP-Update 2.x
http://secunia.com/product/12926/

DESCRIPTION:
rgod has discovered some vulnerabilities in PHP-Update, which can be
exploited by malicious people to bypass certain security restrictions
and by malicious users to compromise vulnerable systems and manipulate
data.

1) The security bypass vulnerability is caused due to an insecure
authentication method in blog.php. This can be exploited to bypass
authentication and post blog entries by passing the value "1" to the
parameters "adminuser" and "permission".

2) Input passed to the "newmessage" parameter in blog.php is not
properly sanitised before being written to a web-accessible file.
This can be exploited to execute arbitrary PHP code.

Successful exploitation requires valid user credentials (but see 1).

3) Input passed to the "f" parameter in blog.php is not properly
sanitised before being used to write files. This can be exploited to
create and overwrite arbitrary files with the file extension ".php"
via directory traversal attacks.

Successful exploitation requires valid user credentials (but see 1).

The vulnerabilities are confirmed in version 2.7 flat file edition
but not in version 2.7 MySQL edition. Other versions may also be
affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised and
that authentication is done correctly.

PROVIDED AND/OR DISCOVERED BY:
rgod

ORIGINAL ADVISORY:
http://www.milw0rm.com/exploits/2953

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