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RedHat: 'groff' Buffer overflow vulnerability Print E-mail
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Posted by Team   
RedHat Linux New groff packages have been made available that fix an overflow in groff.If the printing system running this is a security issue, it is recommendedto update to the new, fixed packages.

                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          New groff packages available to fix security problems
Advisory ID:       RHSA-2002:004-06
Issue date:        2002-01-07
Updated on:        2002-01-14
Product:           Red Hat Linux
Keywords:          groff security
Cross references:  

1. Topic:

New groff packages have been made available that fix an overflow in groff.
If the printing system running this is a security issue, it is recommended
to update to the new, fixed packages.

2. Relevant releases/architectures:

Red Hat Linux 7.0 - alpha, i386

Red Hat Linux 7.1 - alpha, i386, ia64

Red Hat Linux 7.2 - i386, ia64

3. Problem description:

Groff is a document formatting system.  The groff preprocessor contains an
exploitable buffer overflow. If groff can be invoked within the LPRng
printing system, an attacker can gain rights as the "lp" user.

Remote exploitation may be possible if lpd is running and is accessible
remotely, and the attacker knows the name of the printer and spoolfile.

The Common Vulnerabilities and Exposures project ( has
assigned the name CAN-2002-0003 to this issue.

Thanks to zen-parse for bringing this bug to our attention.

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
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. Bug IDs fixed  (http://bugzilla.Red for more info):

6. RPMs required:

Red Hat Linux 7.0:




Red Hat Linux 7.1:





Red Hat Linux 7.2:




7. Verification:

MD5 sum                          Package Name
4fe878d0720088830c29954d25c9e032 7.0/en/os/SRPMS/groff-1.16-7.1.src.rpm
b37f80ae0a4e6ad49b3d697376cfdde2 7.0/en/os/alpha/groff-1.16-7.1.alpha.rpm
6e7cfc9cf998ac9a6a6401d627acdea4 7.0/en/os/i386/groff-1.16-7.1.i386.rpm
1d4e9b5068fcf178ddacf032c0db523d 7.1/en/os/SRPMS/groff-1.17.2-7.0.2.src.rpm
93cbf905335c1474ed9e632c0ec83738 7.1/en/os/alpha/groff-1.17.2-7.0.2.alpha.rpm
f3181dd6c32ffc9478721244b77c89af 7.1/en/os/i386/groff-1.17.2-7.0.2.i386.rpm
4f08644532e54b8c3553b04148424e56 7.1/en/os/ia64/groff-1.17.2-7.0.2.ia64.rpm
1d4e9b5068fcf178ddacf032c0db523d 7.2/en/os/SRPMS/groff-1.17.2-7.0.2.src.rpm
f3181dd6c32ffc9478721244b77c89af 7.2/en/os/i386/groff-1.17.2-7.0.2.i386.rpm
4f08644532e54b8c3553b04148424e56 7.2/en/os/ia64/groff-1.17.2-7.0.2.ia64.rpm

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

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

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

8. References:

Copyright(c) 2000, 2001, 2002 Red Hat, Inc.

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