8518 : X11 / XFree86 xterm Local Overflow
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Info

Last Modified

5 months ago

Percent Complete

100%

Disclosure

Apr 27, 1998

Discovery

Unknown

Dates

Exploit

Unknown

Solution

Unknown

Description

The xterm terminal emulator contains a flaw that may allow a local malicious user to overflow a buffer associated to the inputMethod, preeditType, and *Keymap resources. The issue is triggered when a specially crafted string containing machine code is used to set a specific resource. It is possible that the flaw may allow the user to gain root privileges by spawning a setuid-root shell resulting in a loss of system integrity.

Classification

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

Solution

Upgrade to X11 to version X11R6.5 or higher, and upgrade XFree86 to version 3.3.2 patch 1 or higer, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by implementing the following workaround.

Simply remove the setuid root bit from the xterm binary:

chmod 0755 /path/to/xterm

Products

XFree86 Project, Inc.
Watch-list
XFree86
Watch-list
3.0.x
3.1.x
3.2.x
3.3.1
3.3.2
3.3.2p1
X.Org Foundation
Watch-list
X11
Watch-list
R3
R4
R5
R6
R6.1
R6.2
R6.3
R6.4

References

Credit

  • The Open Group - The Open Group

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