Xconq USER and DISPLAY environment variable buffer overflow

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

Description:

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'.


Consequences:

Gain Privileges

Remedy:

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.

References:

  • 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

Reported:

Jul 28, 2003

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