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SCO Security Advisory

Subject: OpenServer 5.0.6 OpenServer 5.0.7 : Multiple Vulnerabilities in Sendmail
Advisory number: SCOSA-2004.11
Issue date: 2004 July 28
Cross reference: sr876461 fz527630 erg712277 CAN-2003-0161 CA-2003-12
sr884730 fz528323 erg712435 CAN-2003-0694 CA-2003-25
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1. Problem Description

CERT Advisory CA-2003-12

There is a vulnerability in sendmail that can be exploited
to cause a denial-of-service condition and could allow a
remote attacker to execute arbitrary code with the privileges
of the sendmail daemon, typically root.

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2003-0161 to this issue.

CERT Advisory CA-2003-25

The prescan function in Sendmail 8.12.9 allows remote attackers
to execute arbitrary code via buffer overflow attacks, as
demonstrated using the parseaddr function in parseaddr.c.

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2003-0694 to this issue.

2. Vulnerable Supported Versions

System Binaries
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OpenServer 5.0.6 Sendmail distribution
OpenServer 5.0.7 Sendmail distribution

3. Solution

The proper solution is to install the latest packages.

4. OpenServer 5.0.6

4.1 First install OSS646B or later - Execution Environment Supplement

ftp://ftp.sco.com/pub/openserver5/oss646b

4.2 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.11

4.3 Verification

MD5 (VOL.000.000) = ff18b1666956ea57c9d54008c6ee9444

md5 is available for download from
ftp://ftp.sco.com/pub/security/tools

4.4 Installing Fixed Binaries

Upgrade the affected binaries with the following sequence:

1) Download the VOL* files to a directory

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

5. OpenServer 5.0.7

5.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.11

The fixes are also available in SCO OpenServer Release 5.0.7
Maintenance Pack 3 or later. See
http://www.sco.com/support/update/download/osr507list.html.

5.2 Verification

MD5 (VOL.000.000) = ff18b1666956ea57c9d54008c6ee9444

MD5 (507mp3_vol.tar) = c927aefdd50b50aca5d29e08c1562aec

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 the VOL* files to a directory

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

Or see the Maintenance Pack 3 Release and Installation Notes at

ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.txt

6. References

Specific references for this advisory:
http://www.cert.org/advisories/CA-2003-12.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0161
http://www.kb.cert.org/vuls/id/897604
http://www.cert.org/advisories/CA-2003-25.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0694
http://www.kb.cert.org/vuls/id/784980

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 sr876461 fz527630
erg712277 sr884730 fz528323 erg712435.

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

Michal Zalewski <lcamtuf (at) ghettot (dot) org [email concealed]> discovered and
researched these issues. Thanks to Eric Allman, Claus
Assmann, Greg Shapiro, and Dave Anderson of Sendmail

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