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Category:   Application (Game)  >   FreeStyle Chat Server Vendors:   Hartmann, Gus and Keller, Peter
Freesweep Buffer Overflows Let Local Users Obtain 'games' Group Privileges
SecurityTracker Alert ID:  1007829
SecurityTracker URL:
CVE Reference:   CVE-2003-0828   (Links to External Site)
Date:  Sep 29 2003
Impact:   Execution of arbitrary code via local system, User access via local system

Description:   Some buffer overflow vulnerabilities were reported in the Freesweep game software. A local user may be able to obtain elevated privileges on the system.

It is reported that a local user can set certain environment variables to a specially crafted value and then invoke freesweep to execute arbitrary code. Because freesweep is configured with set group id (setgid) 'games' group privileges, a local user can obtain 'games' group privileges.

From code inspection, it appears that the HOME and USER environment variables are affected.

Steve Kemp is credited with discovery.

Impact:   A local user can execute arbitrary code with 'games' group privileges.
Solution:   No solution was available at the time of this entry.
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 29 2003 (Debian Issues Fix) Freesweep Buffer Overflows Let Local Users Obtain 'games' Group Privileges
Debian has released a fix.

 Source Message Contents

Subject:  CVE-2003-0828

CVE: CAN-2003-0828

Debian reported that Steve Kemp discovered a buffer overflow in the freesweep game.  The 
buffer overflow reportedly occurs when processing certain environment variables.

A local user can exploit the flaw to gain gid 'games'.


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