From: Secunia Security Advisories (sec-advsecunia.com)
Date: Fri Aug 01 2003 - 11:05:04 CDT

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TITLE:
GameSpy Arcade ".APK" File Directory Traversal Vulnerability

READ ONLINE:
http://www.secunia.com/advisories/9412/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
From remote

SOFTWARE:
GameSpy Arcade 1.x

DESCRIPTION:
A vulnerability has been identified in GameSpy Arcade, which can be
exploited by malicious people to write files to an arbitrary location
on a user's system.

The vulnerability is caused due to an input validation error in the
game update agent ("GSAPAK.EXE") when handling ".APK" files
(basically a normal ZIP file). This can be exploited via a classical
directory traversal attack by constructing a malicious ".APK" file,
which extracts the included files to arbitrary locations on a user's
system when the file is opened.

Since GameSpy Arcade during installation adds three mime types to the
list of accepted browser documents, it is possible to exploit the
vulnerability automatically by tricking the user into visiting a
malicious web site with a browser.

Successful exploitation writes the files to the user's system with
the user's privileges.

NOTE: ".arcade" and ".asn" files will also be launched by
"GSAPAK.exe" automatically.

SOLUTION:
A patch should be available, which can be installed automatically via
GameSpy Arcade.

REPORTED BY / CREDITS:
Mike Kristovich

ORIGINAL ADVISORY:
http://www.threezee.com/sections/security/tzt002.txt

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