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Category:   Application (Web Browser)  >   Lynx Vendors:   [Multiple Authors/Vendors]
(Red Hat Issues Fix) Lynx '.mime.types' and '.mailcap' File Processing Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1021108
SecurityTracker URL:  http://securitytracker.com/id/1021108
CVE Reference:   CVE-2006-7234   (Links to External Site)
Date:  Oct 27 2008
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.8.6rel.4
Description:   A vulnerability was reported in Lynx. A local user can obtain elevated privileges on the target system.

The browser opens '.mime.types' and '.mailcap' files in the current directory. A local user can create specially crafted files in a directory. When the target user executes lynx from the directory, arbitrary code will be executed with the privileges of the target user.

Impact:   A local user can obtain elevated privileges on the target 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:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  2.1, 3, 4, 5

Message History:   This archive entry is a follow-up to the message listed below.
Oct 27 2008 Lynx '.mime.types' and '.mailcap' File Processing Lets Local Users Gain Elevated Privileges



 Source Message Contents

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


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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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