[SA22000] Feedsplitter Script Insertion and Local File Inclusion

TITLE:
Feedsplitter Script Insertion and Local File Inclusion

SECUNIA ADVISORY ID:
SA22000

VERIFY ADVISORY:
http://secunia.com/advisories/22000/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting, Exposure of sensitive information, System
access

WHERE:
>From remote

SOFTWARE:
Feedsplitter
http://secunia.com/product/12011/

DESCRIPTION:
Jonathan Rockway has reported some vulnerabilities in Feedsplitter,
which can be exploited by malicious people to disclose certain
sensitive information, conduct script insertion attacks, or
compromise a vulnerable system.

1) Some input validation errors exist in the processing of RSS/RDF
feeds in feedsplitter.php. This can be exploited to insert arbitrary
HTML and script code, which will be executed in a user's browser
session in context of a site that uses the Feedsplitter script to
display content from a malicious feed.

2) Input passed to the "format" parameter in feedsplitter.php is not
properly verified before being used to parse files. This can be
exploited to disclose the contents of certain XML files on the system
via directory traversal attacks.

Note: This can further be exploited to execute arbitrary PHP code on
a vulnerable system, but requires that "magic_quotes_gpc" is disabled
and that the path to the cache directory is known when not using the
default setting.
The script also contains a function "showsource()", which can be used
to disclose the source code of the script.

The vulnerabilities have been confirmed in version 2006-01-21. Other
versions may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
Jonathan Rockway

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