Red Hat Linux Advisory: lynx

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                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated lynx packages fix CRLF injection vulnerability
Advisory ID:       RHSA-2003:029-06
Issue date:        2003-01-28
Updated on:        2003-02-12
Product:           Red Hat Linux
Keywords:          lynx CRLF
Cross references:  
Obsoletes:         
CVE Names:         CAN-2002-1405
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1. Topic:

Updated lynx packages are available that fix an error in the way lynx
parses its command line arguments, which can lead to faked headers being
sent to a web server.

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
Red Hat Linux 8.0 - i386

3. Problem description:

Lynx is a character-cell Web browser, suitable for running on terminals
such as VT100.

Lynx constructs its HTTP queries from the command line (or WWW_HOME
environment variable) without regard to special characters such as carriage
returns or linefeeds.  When given a URL containing such special characters,
extra headers could be inserted into the request.  This could cause scripts
using lynx to fetch data from the wrong site from servers with virtual hosting.

Users of Lynx are advised to upgrade to these erratum packages, which
contain a patch to correct this isssue.

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:

up2date

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:

SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/lynx-2.8.3-2.1.src.rpm

i386:
ftp://updates.redhat.com/6.2/en/os/i386/lynx-2.8.3-2.1.i386.rpm

Red Hat Linux 7.0:

SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/lynx-2.8.4-9.1.src.rpm

i386:
ftp://updates.redhat.com/7.0/en/os/i386/lynx-2.8.4-9.1.i386.rpm

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/lynx-2.8.4-9.1.src.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/lynx-2.8.4-9.1.i386.rpm

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/lynx-2.8.4-18.1.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/lynx-2.8.4-18.1.i386.rpm

ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/lynx-2.8.4-18.1.ia64.rpm

Red Hat Linux 7.3:

SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/lynx-2.8.4-18.1.src.rpm

i386:
ftp://updates.redhat.com/7.3/en/os/i386/lynx-2.8.4-18.1.i386.rpm

Red Hat Linux 8.0:

SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/lynx-2.8.5-7.1.src.rpm

i386:
ftp://updates.redhat.com/8.0/en/os/i386/lynx-2.8.5-7.1.i386.rpm



6. Verification:

MD5 sum                          Package Name
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ee2ec726b41f93d3787abbcf2760cdfe 6.2/en/os/SRPMS/lynx-2.8.3-2.1.src.rpm
4f8b6cafe29d38e498e8d495ec687e8d 6.2/en/os/i386/lynx-2.8.3-2.1.i386.rpm
2ef0ea9eaacd3745869855b3e09b3094 7.0/en/os/SRPMS/lynx-2.8.4-9.1.src.rpm
fdf7f4ede3587e9ee9bad3b722da5f0e 7.0/en/os/i386/lynx-2.8.4-9.1.i386.rpm
2ef0ea9eaacd3745869855b3e09b3094 7.1/en/os/SRPMS/lynx-2.8.4-9.1.src.rpm
fdf7f4ede3587e9ee9bad3b722da5f0e 7.1/en/os/i386/lynx-2.8.4-9.1.i386.rpm
45dbab8b692beafc8e9bfb367bc37892 7.2/en/os/SRPMS/lynx-2.8.4-18.1.src.rpm
da2e0cc072fe3f313a4cd1ba1d2a9229 7.2/en/os/i386/lynx-2.8.4-18.1.i386.rpm
c9f787ae94edc0182b015524593f82a7 7.2/en/os/ia64/lynx-2.8.4-18.1.ia64.rpm
45dbab8b692beafc8e9bfb367bc37892 7.3/en/os/SRPMS/lynx-2.8.4-18.1.src.rpm
da2e0cc072fe3f313a4cd1ba1d2a9229 7.3/en/os/i386/lynx-2.8.4-18.1.i386.rpm
6e0af76d0632ec353555843a84bb2a02 8.0/en/os/SRPMS/lynx-2.8.5-7.1.src.rpm
96fd9d05a357e6a0d11d5a2916b90485 8.0/en/os/i386/lynx-2.8.5-7.1.i386.rpm


These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at http://www.redhat.com/about/contact/pgpkey.html

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

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


7. References:

http://www.mail-archive.com/bugtraq@securityfocus.com/msg08897.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1405

8. Contact:

The Red Hat security contact is <security@redhat.com>.  More contact
details at http://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.