Xconq USER and DISPLAY environment variable buffer overflow

xconq-user-display-bo (12765) The risk level is classified as HighHigh Risk


Xconq is vulnerable to a buffer overflow, caused by improper bounds checking of user-supplied environment variables. By passing an overly long string to the USER or DISPLAY environment variable, a local attacker could overflow a buffer and execute arbitrary code on the system with privileges of the GID 'games'.


Gain Privileges


For Debian GNU/Linux3.0 (woody):
Upgrade to the latest Xconq package (7.4.1-2woody2 or later), as listed in DSA-354-1. See References.

For other distributions:
Contact your vendor for upgrade or patch information.


  • Xconq Web site: Xconq Home Page.
  • BID-8307: XConq Multiple Environment Variable Buffer Overflow Vulnerabilities
  • CVE-2003-0607: Buffer overflow in xconq 7.4.1 allows local users to become part of the games group via the (1) USER or (2) DISPLAY environment variables.
  • DSA-354: xconq -- buffer overflows
  • OSVDB ID: 2304: Xconq USER Environment Variable Privilege Escalation

Platforms Affected:

  • Apple Macintosh
  • Debian Debian Linux 3.0
  • RedHat Xconq 7.x


Jul 28, 2003

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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