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RedHat: rxvt multiple vulnerabilities Print E-mail
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Posted by Team   
RedHat Linux Updated rxvt packages are available which fix a number of vulnerabilities in the handling of escape sequences.

                   Red Hat Security Advisory

Synopsis:          Updated rxvt packages fix various vulnerabilites
Advisory ID:       RHSA-2003:054-00
Issue date:        2003-03-17
Updated on:        2003-03-17
Product:           Red Hat Linux
Keywords:          trojan escape reporting
Cross references:  
CVE Names:         CAN-2003-0022 CAN-2003-0023 CAN-2003-0066

1. Topic:

Updated rxvt packages are available which fix a number of vulnerabilities
in the handling of escape sequences.

2. Relevant releases/architectures:

Red Hat Linux 6.2 - i386
Red Hat Linux 7.0 - i386
Red Hat Linux 7.1 - i386
Red Hat Linux 7.2 - i386, ia64
Red Hat Linux 7.3 - i386

3. Problem description:

Rxvt is a color VT102 terminal emulator for the X Window System.  A number
of issues have been found in the escape sequence handling of Rxvt.
These could be potentially exploited if an attacker can cause carefully
crafted escape sequences to be displayed on a rxvt terminal being used by
their victim. 

One of the features which most terminal emulators support is the ability
for the shell to set the title of the window using an escape sequence. 
Certain xterm variants, including rxvt, also provide an escape sequence for
reporting the current window title.  This essentially takes the current
title and places it directly on the command line.   Since it is not
possible to embed a carriage return into the window title itself, the
attacker would have to convince the victim to hit enter for it to process
the title as a command, although the attacker can perform a number of
actions to increase the likelyhood of this happening.

The "screen dump" feature in rxvt 2.7.8 allows attackers to overwrite
arbitrary files via a certain character escape sequence when it is echoed
to a user's terminal, e.g. when the user views a file containing the
malicious sequence.

The menuBar feature in rxvt 2.7.8 allows attackers to modify menu options
and execute arbitrary commands via a certain character escape sequence that
inserts the commands into the menu.

Users of Rxvt are advised to upgrade to these errata packages which contain
a patch to disable the title reporting functionality and patches to correct
the other issues.

Red Hat would like to thank H D Moore for bringing these issues to our

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:


This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. RPMs required:

Red Hat Linux 6.2:



Red Hat Linux 7.0:



Red Hat Linux 7.1:



Red Hat Linux 7.2:




Red Hat Linux 7.3:



6. Verification:

MD5 sum                          Package Name
356e4148537e1e522cdcbedfb735ef80 6.2/en/os/SRPMS/rxvt-2.7.8-
8ce644f8e66b473ef91ea5baa70066ea 6.2/en/os/i386/rxvt-2.7.8-
08bc3ef32e1bc77836dc266af8ef2fa1 7.0/en/os/SRPMS/rxvt-2.7.8-
b93bc19a8403c72943b33779b44b28fe 7.0/en/os/i386/rxvt-2.7.8-
cf99378c595e06eed1ff0c2a493d0472 7.1/en/os/SRPMS/rxvt-2.7.8-
f973a30d1f45f561a1e15d4c58615526 7.1/en/os/i386/rxvt-2.7.8-
f5b4712eeb3c941b9b5f2cf3ab6d6dc4 7.2/en/os/SRPMS/rxvt-2.7.8-4.src.rpm
94a3cbbf0dbd8739e9b1b2cc716a326e 7.2/en/os/i386/rxvt-2.7.8-4.i386.rpm
781b84624dda1114d74d09814438c54a 7.2/en/os/ia64/rxvt-2.7.8-4.ia64.rpm
f5b4712eeb3c941b9b5f2cf3ab6d6dc4 7.3/en/os/SRPMS/rxvt-2.7.8-4.src.rpm
94a3cbbf0dbd8739e9b1b2cc716a326e 7.3/en/os/i386/rxvt-2.7.8-4.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at  http://www.Red

You can verify each package with the following command:
    rpm --checksig -v 

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:

7. References:

8. Contact:

The Red Hat security contact is <security@Red>.  More contact
details at  http://www.Red

Copyright 2003 Red Hat, Inc.

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