Xterm Loop-Based Escape Sequence Denial Of Service Vulnerability

BID:6950

Info

Xterm Loop-Based Escape Sequence Denial Of Service Vulnerability

Bugtraq ID: 6950
Class: Design Error
CVE: CVE-2003-0071
CVE-2003-0071
Remote: No
Local: Yes
Published: Feb 25 2003 12:00AM
Updated: Mar 19 2015 08:09AM
Credit: Discovery of these issues is credited to H D Moore and Digital Defense.
Vulnerable: XFree86 X11R6 4.2.1
+ Immunix Immunix OS 7.3
+ MandrakeSoft Corporate Server 2.1 x86_64
+ MandrakeSoft Corporate Server 2.1
+ Mandriva Linux Mandrake 9.0
+ RedHat Linux 7.3
+ Slackware Linux 8.1
XFree86 X11R6 4.2 .0
+ Conectiva Linux Enterprise Edition 1.0
+ S.u.S.E. Linux 8.0 i386
+ S.u.S.E. Linux 8.0
+ Turbolinux Turbolinux Server 8.0
+ Turbolinux Turbolinux Workstation 8.0
XFree86 X11R6 4.1 .0
+ Debian Linux 3.0 sparc
+ Debian Linux 3.0 s/390
+ Debian Linux 3.0 ppc
+ Debian Linux 3.0 mipsel
+ Debian Linux 3.0 mips
+ Debian Linux 3.0 m68k
+ Debian Linux 3.0 ia-64
+ Debian Linux 3.0 ia-32
+ Debian Linux 3.0 hppa
+ Debian Linux 3.0 arm
+ Debian Linux 3.0 alpha
+ Debian Linux 3.0
+ Red Hat Enterprise Linux AS 2.1
+ RedHat Advanced Workstation for the Itanium Processor 2.1
+ RedHat Enterprise Linux ES 2.1
+ RedHat Enterprise Linux WS 2.1
+ RedHat Linux 7.2 i386
+ RedHat Linux 7.1 i386
+ Turbolinux Turbolinux Server 7.0
+ Turbolinux Turbolinux Workstation 7.0
XFree86 X11R6 4.0.3
+ RedHat Linux 7.1
XFree86 X11R6 4.0.1
+ RedHat Linux 7.0
XFree86 X11R6 4.0
Sun Linux 5.0.6
RedHat XFree86-Xvfb-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-Xnest-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-xfs-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-xdm-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-xauth-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-twm-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-truetype-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-tools-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-Mesa-libGLU-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-Mesa-libGL-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-libs-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-ISO8859-9-75dpi-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-ISO8859-9-100dpi-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-ISO8859-2-75dpi-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-ISO8859-2-100dpi-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-ISO8859-15-75dpi-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-ISO8859-15-100dpi-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-font-utils-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-doc-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-devel-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-cyrillic-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-base-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-75dpi-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
RedHat XFree86-100dpi-fonts-4.2.0-72.i386.rpm
+ RedHat Linux 8.0 i386
Not Vulnerable:

Discussion

Xterm Loop-Based Escape Sequence Denial Of Service Vulnerability

The Xterm terminal fails to sufficiently filter certain potentially malicious loop-based escape sequences, leaving the terminal open to attacks including attacker-initiated tight loops that may exhaust CPU resources.

The problem has been reported to result from a lack of sufficient sanitization of potentially malicious escape sequences, which are handled by the DEC UDK processor implementation in the vulnerable terminal.

It is possible to exploit these issues if an attacker can cause malicious escape sequences to be displayed in a terminal window of a vulnerable terminal emulator.

Exploit / POC

Xterm Loop-Based Escape Sequence Denial Of Service Vulnerability

There is no exploit code required.

Solution / Fix

Xterm Loop-Based Escape Sequence Denial Of Service Vulnerability

Solution:
Red Hat has released an advisory (RHSA-2003:064-01) to address this issue. Details on obtaining and applying fixes are contained in the referenced advisory.

Red Hat has released a revised advisory (RHSA-2003:067-02) to address this issue. Fixes from the previous advisory (RHSA-2003:067-01) are functional but contain debugging info. The revised advisory includes new fixes that do not contain debugging info. Details on obtaining and applying fixes are contained in the revised advisory.

Sun Linux updates have been released to correct this issue.

Debian has released an advisory (DSA 380-1) with fixes to address this issue. Please see the referenced advisory for more information.


Redhat XFree86-ISO8859-9-75dpi-fonts-4.2.0-72.i386.rpm

Redhat XFree86-xdm-4.2.0-72.i386.rpm

Redhat XFree86-xfs-4.2.0-72.i386.rpm

Redhat XFree86-base-fonts-4.2.0-72.i386.rpm

Redhat XFree86-Xnest-4.2.0-72.i386.rpm

Redhat XFree86-cyrillic-fonts-4.2.0-72.i386.rpm

Redhat XFree86-ISO8859-15-75dpi-fonts-4.2.0-72.i386.rpm

Redhat XFree86-libs-4.2.0-72.i386.rpm

Redhat XFree86-tools-4.2.0-72.i386.rpm

Redhat XFree86-devel-4.2.0-72.i386.rpm

Redhat XFree86-truetype-fonts-4.2.0-72.i386.rpm

Redhat XFree86-Xvfb-4.2.0-72.i386.rpm

Redhat XFree86-75dpi-fonts-4.2.0-72.i386.rpm

Redhat XFree86-4.2.0-72.i386.rpm

Redhat XFree86-ISO8859-9-100dpi-fonts-4.2.0-72.i386.rpm

Redhat XFree86-Mesa-libGLU-4.2.0-72.i386.rpm

Redhat XFree86-100dpi-fonts-4.2.0-72.i386.rpm

Redhat XFree86-xauth-4.2.0-72.i386.rpm

Redhat XFree86-ISO8859-2-100dpi-fonts-4.2.0-72.i386.rpm

Redhat XFree86-Mesa-libGL-4.2.0-72.i386.rpm

Redhat XFree86-ISO8859-15-100dpi-fonts-4.2.0-72.i386.rpm

Redhat XFree86-doc-4.2.0-72.i386.rpm

Redhat XFree86-font-utils-4.2.0-72.i386.rpm

Redhat XFree86-ISO8859-2-75dpi-fonts-4.2.0-72.i386.rpm

XFree86 X11R6 4.1 .0

Sun Linux 5.0.6

References

Xterm Loop-Based Escape Sequence Denial Of Service Vulnerability

References:

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