To: announce@lists.caldera.com <mailto:announce@lists.caldera.com> bugtraq@securityfocus.com <mailto:bugtraq@securityfocus.com> full-disclosure@lists.netsys.com <mailto:full-disclosure@lists.netsys.com>

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______________________________________________________________________________

SCO Security Advisory

Subject: OpenServer 5.0.7 OpenServer 5.0.6 OpenServer 5.0.5 : Multiple security vulnerabilities in Xsco
Advisory number: CSSA-2003-SCO.26
Issue date: 2003 October 10
Cross reference: sr862609 fz520528 erg712006 sr860995 fz520242 erg711972 CAN-2002-0158 CAN-2002-0164 
______________________________________________________________________________


1. Problem Description

This supplement corrects two unrelated security problems in the
SCO OpenServer "Xsco" X11 server.

First,

NSFOCUS Security Team has found a buffer overflow vulnerability
in Xsun shipped with Solaris system when processing a
command line parameter "-co", which could enable a local
attacker to run arbitrary code with root user/root group
privilege. 

Kevin Finisterre of Snosoft.com discovered that Xsco was also
vulnerable. 

The Common Vulnerabilities and Exposures (CVE) project has assigned 
the name CAN-2002-0158 to this issue. This is a candidate for 
inclusion in the CVE list (<http://cve.mitre.org>), which standardizes 
names for security problems. Candidates may change significantly
before they become official CVE entries.

Second,

Roberto Zunino discovered a vulnerability in the MIT-SHM extension in
all X servers that are running as root.

Any user with local X access can exploit the MIT-SHM extension and gain
read/write access to any shared memory segment on the system. 

The Common Vulnerabilities and Exposures (CVE) project has assigned
the name CAN-2002-0164 to this issue. This is a candidate for
inclusion in the CVE list (<http://cve.mitre.org>), which standardizes
names for security problems. Candidates may change significantly
before they become official CVE entries.


2. Vulnerable Supported Versions

System Binaries
----------------------------------------------------------------------
OpenServer 5.0.7 /usr/bin/X11/Xsco
OpenServer 5.0.6 /usr/bin/X11/Xsco
OpenServer 5.0.5 /usr/bin/X11/Xsco


3. Solution

The proper solution is to install the latest packages.


4. OpenServer 5.0.7, OpenServer 5.0.6, OpenServer 5.0.5

4.1 Location of Fixed Binaries

<ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.26>


4.2 Verification

MD5 (VOL.000.000) = e7cbf7a8094ba43d44a6657a95673aeb
MD5 (VOL.001.000) = 2eca28ac86436cec5fa7f059ab2fe850

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 the VOL* files to the /tmp directory

2) Run the custom command, specify an install from media
images, and specify the /tmp directory as the location of
the images.


5. References

Specific references for this advisory:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0158> 
<http://marc.theaimsgroup.com/?l=bugtraq&m=101776858410652&w=2> 
<http://archives.neohapsis.com/archives/vulnwatch/2002-q2/0000.html>
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0164>
<http://marc.theaimsgroup.com/?l=bugtraq&m=103547625009363&w=2>
<http://xforce.iss.net/xforce/xfdb/8706>
<http://www.securityfocus.com/bid/4396>
<http://www.linuxsecurity.com/advisories/caldera_advisory-2006.html>
<ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.14/CSSA-2002-SCO.14.txt>
SCO security resources:

<http://www.sco.com/support/security/index.html>

This security fix closes SCO incidents sr862609 fz520528
erg712006 sr860995 fz520242 erg711972


6. 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.

7. Acknowledgments

SCO would like to thank the NSFOCUS Security Team for finding
the "-co" vulnerability, and Kevin Finisterre of Snosoft.com for
confirming its applicability to Xsco. SCO would also like to
thank Roberto Zunino for discovering the MIT-SHM vulnerability.

______________________________________________________________________________

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