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Category:   Application (Web Browser)  >   Lynx Vendors:   [Multiple Authors/Vendors]
(Red Hat Issues Fix) Lynx 'lynxcgi:' URL Handler Bug Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1021106
SecurityTracker URL:  http://securitytracker.com/id/1021106
CVE Reference:   CVE-2008-4690   (Links to External Site)
Date:  Oct 27 2008
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.8.6dev.15 and prior versions
Description:   A vulnerability was reported in Lynx. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted 'lynxcgi:' URL that, when loaded by the target user, will execute arbitrary code on the target user's system. The code will run with the privileges of the target user.

The software is affected when running in 'Advanced' user mode (not the default configuration).

Impact:   A remote user can create a URL that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2008-0965.html

Vendor URL:  lynx.isc.org/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  2.1, 3, 4, and 5

Message History:   This archive entry is a follow-up to the message listed below.
Oct 27 2008 Lynx 'lynxcgi:' URL Handler Bug Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2008:0965-01] Important: lynx security update


-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: lynx security update
Advisory ID:       RHSA-2008:0965-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0965.html
Issue date:        2008-10-27
CVE Names:         CVE-2008-4690 CVE-2006-7234 
=====================================================================

1. Summary:

An updated lynx package that corrects two security issues is now available
for Red Hat Enterprise Linux 2.1, 3, 4, and 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1  - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Description:

Lynx is a text-based Web browser.

An arbitrary command execution flaw was found in the Lynx "lynxcgi:" URI
handler. An attacker could create a web page redirecting to a malicious URL
that could execute arbitrary code as the user running Lynx in the
non-default "Advanced" user mode. (CVE-2008-4690)

Note: In these updated lynx packages, Lynx will always prompt users before
loading a "lynxcgi:" URI. Additionally, the default lynx.cfg configuration
file now marks all "lynxcgi:" URIs as untrusted by default.

A flaw was found in a way Lynx handled ".mailcap" and ".mime.types"
configuration files. Files in the browser's current working directory were
opened before those in the user's home directory. A local attacker, able to
convince a user to run Lynx in a directory under their control, could
possibly execute arbitrary commands as the user running Lynx. (CVE-2006-7234)

All users of Lynx are advised to upgrade to this updated package, which
contains backported patches correcting these issues.

4. Solution:

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

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

5. Bugs fixed (http://bugzilla.redhat.com/):

214205 - CVE-2006-7234 lynx: .mailcap and .mime.types files read from CWD
468184 - CVE-2008-4690 lynx: remote arbitrary command execution via a crafted lynxcgi: URL

6. Package List:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 :

Source:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/lynx-2.8.4-18.1.3.src.rpm

i386:
lynx-2.8.4-18.1.3.i386.rpm

ia64:
lynx-2.8.4-18.1.3.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/lynx-2.8.4-18.1.3.src.rpm

ia64:
lynx-2.8.4-18.1.3.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/lynx-2.8.4-18.1.3.src.rpm

i386:
lynx-2.8.4-18.1.3.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/lynx-2.8.4-18.1.3.src.rpm

i386:
lynx-2.8.4-18.1.3.i386.rpm

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/lynx-2.8.5-11.3.src.rpm

i386:
lynx-2.8.5-11.3.i386.rpm
lynx-debuginfo-2.8.5-11.3.i386.rpm

ia64:
lynx-2.8.5-11.3.ia64.rpm
lynx-debuginfo-2.8.5-11.3.ia64.rpm

ppc:
lynx-2.8.5-11.3.ppc.rpm
lynx-debuginfo-2.8.5-11.3.ppc.rpm

s390:
lynx-2.8.5-11.3.s390.rpm
lynx-debuginfo-2.8.5-11.3.s390.rpm

s390x:
lynx-2.8.5-11.3.s390x.rpm
lynx-debuginfo-2.8.5-11.3.s390x.rpm

x86_64:
lynx-2.8.5-11.3.x86_64.rpm
lynx-debuginfo-2.8.5-11.3.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/lynx-2.8.5-11.3.src.rpm

i386:
lynx-2.8.5-11.3.i386.rpm
lynx-debuginfo-2.8.5-11.3.i386.rpm

x86_64:
lynx-2.8.5-11.3.x86_64.rpm
lynx-debuginfo-2.8.5-11.3.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/lynx-2.8.5-11.3.src.rpm

i386:
lynx-2.8.5-11.3.i386.rpm
lynx-debuginfo-2.8.5-11.3.i386.rpm

ia64:
lynx-2.8.5-11.3.ia64.rpm
lynx-debuginfo-2.8.5-11.3.ia64.rpm

x86_64:
lynx-2.8.5-11.3.x86_64.rpm
lynx-debuginfo-2.8.5-11.3.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/lynx-2.8.5-11.3.src.rpm

i386:
lynx-2.8.5-11.3.i386.rpm
lynx-debuginfo-2.8.5-11.3.i386.rpm

ia64:
lynx-2.8.5-11.3.ia64.rpm
lynx-debuginfo-2.8.5-11.3.ia64.rpm

x86_64:
lynx-2.8.5-11.3.x86_64.rpm
lynx-debuginfo-2.8.5-11.3.x86_64.rpm

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/lynx-2.8.5-18.2.el4_7.1.src.rpm

i386:
lynx-2.8.5-18.2.el4_7.1.i386.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.i386.rpm

ia64:
lynx-2.8.5-18.2.el4_7.1.ia64.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.ia64.rpm

ppc:
lynx-2.8.5-18.2.el4_7.1.ppc.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.ppc.rpm

s390:
lynx-2.8.5-18.2.el4_7.1.s390.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.s390.rpm

s390x:
lynx-2.8.5-18.2.el4_7.1.s390x.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.s390x.rpm

x86_64:
lynx-2.8.5-18.2.el4_7.1.x86_64.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/lynx-2.8.5-18.2.el4_7.1.src.rpm

i386:
lynx-2.8.5-18.2.el4_7.1.i386.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.i386.rpm

x86_64:
lynx-2.8.5-18.2.el4_7.1.x86_64.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/lynx-2.8.5-18.2.el4_7.1.src.rpm

i386:
lynx-2.8.5-18.2.el4_7.1.i386.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.i386.rpm

ia64:
lynx-2.8.5-18.2.el4_7.1.ia64.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.ia64.rpm

x86_64:
lynx-2.8.5-18.2.el4_7.1.x86_64.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/lynx-2.8.5-18.2.el4_7.1.src.rpm

i386:
lynx-2.8.5-18.2.el4_7.1.i386.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.i386.rpm

ia64:
lynx-2.8.5-18.2.el4_7.1.ia64.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.ia64.rpm

x86_64:
lynx-2.8.5-18.2.el4_7.1.x86_64.rpm
lynx-debuginfo-2.8.5-18.2.el4_7.1.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/lynx-2.8.5-28.1.el5_2.1.src.rpm

i386:
lynx-2.8.5-28.1.el5_2.1.i386.rpm
lynx-debuginfo-2.8.5-28.1.el5_2.1.i386.rpm

x86_64:
lynx-2.8.5-28.1.el5_2.1.x86_64.rpm
lynx-debuginfo-2.8.5-28.1.el5_2.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/lynx-2.8.5-28.1.el5_2.1.src.rpm

i386:
lynx-2.8.5-28.1.el5_2.1.i386.rpm
lynx-debuginfo-2.8.5-28.1.el5_2.1.i386.rpm

ia64:
lynx-2.8.5-28.1.el5_2.1.ia64.rpm
lynx-debuginfo-2.8.5-28.1.el5_2.1.ia64.rpm

ppc:
lynx-2.8.5-28.1.el5_2.1.ppc.rpm
lynx-debuginfo-2.8.5-28.1.el5_2.1.ppc.rpm

s390x:
lynx-2.8.5-28.1.el5_2.1.s390x.rpm
lynx-debuginfo-2.8.5-28.1.el5_2.1.s390x.rpm

x86_64:
lynx-2.8.5-28.1.el5_2.1.x86_64.rpm
lynx-debuginfo-2.8.5-28.1.el5_2.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4690
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7234
http://www.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2008 Red Hat, Inc.
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