11922 : XFree86 libX11.so LD_PRELOAD Privilege Escalation
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Timeline

Disclosure Date
2002-09-18

Keywords

CONECTIVA:CLA-2002:529 REDHAT:RHSA-2003:066 REDHAT:RHSA-2003:067 SUSE:SuSE-SA:2002:032

Description

A local overflow exists in XFree86. The libX11.so library fails to do a secure checking with the LD_PRELOAD environment variable while running a SUID executable. As a result an attacker can use his own library to poison a program using dynamically loadable libraries. By setting LD_PRELOAD, an attacker can execute arbitrary code and gain priviledges resulting in a loss of integrity.

Classification

Location: Local Access Required
Attack Type: Input Manipulation
Impact: Loss of Integrity
Exploit: Exploit Rumored
Disclosure: OSVDB Verified

Solution

Upgrade to version 4.2.1 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

XFree86 Project, Inc.	X11R6	4.2.0
		4.1.0

References

Security Tracker: 1005266 1005267
ISS X-Force ID: 10137
CVE ID: 2002-1472 (see also: NVD)
Bugtraq ID: 5735
Keyword: CONECTIVA:CLA-2002:529 REDHAT:RHSA-2003:066 REDHAT:RHSA-2003:067 SUSE:SuSE-SA:2002:032
CIAC Advisory: n-110

Credit

Unknown or Incomplete

CVSSv2 Score

CVSSv2 Base Score = 7.2
Source: nvd.nist.gov | Generated: 2003-12-31 | Disagree?

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