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SCOSA-2005.47.txt

SCOSA-2005.47.txt
Posted Nov 9, 2005
Authored by SCO | Site sco.com

SCO Security Advisory - 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.

tags | advisory, web, overflow, arbitrary, protocol
advisories | CVE-2005-3120
SHA-256 | 3a4f408a9e7a6a4943c8178a7eda2a2ee13c50995972d5fa0fc6e533172fbd78

SCOSA-2005.47.txt

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Hash: SHA1

______________________________________________________________________________

SCO Security Advisory

Subject: UnixWare 7.1.3 UnixWare 7.1.4 : Lynx NNTP Buffer Overflow Vulnerability
Advisory number: SCOSA-2005.47
Issue date: 2005 November 08
Cross reference: fz533159
CVE-2005-3120
______________________________________________________________________________


1. Problem Description

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.


2. Vulnerable Supported Versions

System Binaries
----------------------------------------------------------------------
UnixWare 7.1.3 /usr/gnu/bin/lynx
UnixWare 7.1.4 /usr/gnu/bin/lynx


3. Solution

The proper solution is to install the latest packages.


4. UnixWare 7.1.3

4.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.47


4.2 Verification

MD5 (p533159.image) = bc3fd8c36aea096b7ed75a2f27950b1e

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:

Download p533159.image to the /var/spool/pkg directory

# pkgadd -d /var/spool/pkg/p533159.image


5. UnixWare 7.1.4

5.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.47


5.2 Verification

MD5 (p533159.image) = bc3fd8c36aea096b7ed75a2f27950b1e

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:

Download p533159.image to the /var/spool/pkg directory

# pkgadd -d /var/spool/pkg/p533159.image


6. References

Specific references for this advisory:
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://securitytracker.com/id?1015065
http://secunia.com/advisories/17216

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 incident fz533159.


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 this
vulnerability.

______________________________________________________________________________
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