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TITLE:
XChat "ircs" URI Handling Vulnerability

SECUNIA ADVISORY ID:
SA30695

VERIFY ADVISORY:
http://secunia.com/advisories/30695/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
XChat 2.x
http://secunia.com/product/16027/

DESCRIPTION:
securfrog has discovered a vulnerability in XChat, which can be
exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to an input validation error when
handling "ircs" URIs. This can be exploited to e.g. execute arbitrary
commands on a vulnerable system via a specially crafted "ircs" URI
with a "--command" parameter.

Successful exploitation requires that XChat is running and that the
user is tricked into e.g. browsing a malicious website using Internet
Explorer.

The vulnerability is confirmed in version 2.8.7b for Windows using
Internet Explorer 6. Prior versions may also be affected.

SOLUTION:
Update to version 2.8.7c.
http://www.xchat.org/files/binary/win32/xchat-2.8.7c.exe

PROVIDED AND/OR DISCOVERED BY:
securfrog

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/5795

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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:
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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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