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

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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
        ----------------------------------------------------------------------
        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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