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Assigned : VUPEN/ADV-2006-0135
From : security at sco.com
Subject : SCOSA-2006.7 OpenServer 5.0.7 OpenServer 6.0.0 : Lynx Multiple Vulnerabilities
Date : 2006-01-10
Original Message
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______________________________________________________________________________
SCO Security Advisory
Subject: OpenServer 5.0.7 OpenServer 6.0.0 : Lynx Multiple Vulnerabilities
Advisory number: SCOSA-2006.7
Issue date: 2006 January 10
Cross reference: fz533159 fz533314
CVE-2005-2929 CVE-2005-3120
______________________________________________________________________________
1. Problem Description
Lynx NNTP Buffer Overflow Vulnerability:
Ulf Harnhammar has reported a vulnerability in Lynx, which can
be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to a boundary error in the
"HTrjis()" function in the handling of article headers sent from
NNTP (Network News Transfer Protocol) servers. This can be
exploited to cause a stack-based buffer overflow by e.g.
tricking a user into visiting a malicious web site which
redirects to a malicious NNTP server via the "nntp:" URI
handler.
Successful exploitation allows execution of arbitrary code.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2005-3120 to this issue.
Lynx Command Injection Vulnerability:
Remote exploitation of a command injection vulnerability could
allow attackers to execute arbitrary commands with the
privileges of the underlying user.
The problem specifically exists within the feature to execute
local cgi-bin programs via the "lynxcgi:" URI handler. The
handler is generally intended to be restricted to a specific
directory or program(s). However, due to a configuration error
on multiple platforms, the default settings allow for arbitrary
websites to specify commands to run as the user running Lynx.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2005-2929 to this issue.
2. Vulnerable Supported Versions
System Binaries
----------------------------------------------------------------------
OpenServer 5.0.7 /usr/bin/lynx
OpenServer 6.0.0 /usr/bin/lynx
3. Solution
The proper solution is to install the latest packages.
4. OpenServer 5.0.7
4.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.7
4.2 Verification
MD5 (p533159.507_vol.tar) = f86e8cb4941d567eedfd0ce761f890b3
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
4.3 Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
1) Download p533159.507_vol.tar file to a directory.
2) Extract VOL* files.
# tar xvf p533159.507_vol.tar
3) Run the custom command, specify an install from media images,
and specify the directory as the location of the images.
5. OpenServer 6.0.0
5.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.7
5.2 Verification
MD5 (p533159.600_vol.tar) = 8819b849a7463563a50e9575beb15755
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
5.3 Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
1) Download p533159.600_vol.tar file to a directory.
2) Extract VOL* files.
# tar xvf p533159.600_vol.tar
3) Run the custom command, specify an install from media images,
and specify the directory as the location of the images.
6. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2929
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3120
http://lists.grok.org.uk/pipermail/full-disclosure/2005-October/038019.html
http://secunia.com/advisories/17216
http://securitytracker.com/id?1015065
http://securitytracker.com/id?1015195
http://www.idefense.com/application/poi/display?id=338&type=vulnerabilities
http://www.securityfocus.com/bid/15395
SCO security resources:
http://www.sco.com/support/security/index.html
SCO security advisories via email
http://www.sco.com/support/forums/security.html
This security fix closes SCO incidents fz533159 fz533314.
7. Disclaimer
SCO is not responsible for the misuse of any of the information
we provide on this website and/or through our security
advisories. Our advisories are a service to our customers
intended to promote secure installation and use of SCO
products.
8. Acknowledgments
SCO would like to thank Ulf Harnhammar for reporting the NNTP
buffer overflow vulnerability.
______________________________________________________________________________
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