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SCO Security Advisory

Subject: UnixWare 7.1.4 UnixWare 7.1.3 : The error handling in the inflate and inflateBack functions in ZLib compression library allows local users to cause a denial of service
Advisory number: SCOSA-2004.17
Issue date: 2004 October 18
Cross reference: sr891410 fz530158 erg712692 VU#238678 CAN-2004-0797
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1. Problem Description

CERT Vulnerability Note VU#238678 Un-handled error conditions
in the zlib compression library may allow an attacker to
cause a denial-of-service condition.

The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the following name
CAN-2004-0797 to this issue.

2. Vulnerable Supported Versions

System Binaries
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UnixWare 7.1.4 /usr/include/zconf.h
/usr/include/zlib.h
/usr/lib/libz.so.1.2.1
UnixWare 7.1.3 /usr/include/zconf.h
/usr/include/zlib.h
/usr/lib/libz.so.1.2.1

3. Solution

The proper solution is to install the latest packages.

4. UnixWare 7.1.4

4.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2004.17

4.2 Verification

MD5 (erg712692.714.pkg) = 0b56f889838a2daaed77f8251922391e

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 erg712692.714.pkg to the /var/spool/pkg directory

# pkgadd -d /var/spool/pkg/erg712692.714.pkg

5. UnixWare 7.1.3

5.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2004.17

5.2 Verification

MD5 (erg712692.pkg) = 5c48d63e7f5922dccf38f6d6fa66b325

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 erg712692.pkg to the /var/spool/pkg directory

# pkgadd -d /var/spool/pkg/erg712692.pkg

6. References

Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0797

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 sr891410 fz530158
erg712692.

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 Johan Thelmen for his help in finding
and fixing this bug.

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