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                Caldera International, Inc. Security Advisory

Subject: UnixWare 7.1.1 Open UNIX 8.0.0 : Apache Web Server Chunk Handling Vulnerability / mod_ssl off-by-one error
Advisory number: CSSA-2002-SCO.31
Issue date: 2002 July 01
Cross reference:
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1. Problem Description

        This advisory addresses two separate vulnerabilities:

        1) There is a remotely exploitable vulnerability in the
           handling of large chunks of data in web servers that are
           based on Apache source code.

        2) mod_ssl registers a rewrite_command hook when backward
           compatibility is enabled. The ssl_compat_directive() is
           called for every line read in a configuration file, and
           contains an off-by-one error while doing so.

2. Vulnerable Supported Versions

        System Subsystem
        ----------------------------------------------------------------------
        UnixWare 7.1.1 Apache
        Open UNIX 8.0.0 Apache

3. Solution

        The proper solution is to install the latest packages.

4. UnixWare 7.1.1

        4.1 Location of Fixed Binaries

        ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.31

        4.2 Verification

        MD5 (apache-1.3.26.pkg.Z) = 75391ed80d727d9cd00a73c2cc24816b

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

        4.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following commands:

        Download apache-1.3.26.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/apache-1.3.26.pkg.Z
        # pkgadd -d /var/spool/pkg/apache-1.3.26.pkg

5. Open UNIX 8.0.0

        5.1 Location of Fixed Binaries

        ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.31

        5.2 Verification

        MD5 (apache-1.3.26.pkg.Z) = 75391ed80d727d9cd00a73c2cc24816b

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

        5.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following commands:

        Download apache-1.3.26.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/apache-1.3.26.pkg.Z
        # pkgadd -d /var/spool/pkg/apache-1.3.26.pkg

6. References

        Specific references for this advisory:
                http://www.cert.org/advisories/CA-2002-17.html
                http://httpd.apache.org/info/security_bulletin_20020617.txt
                http://www.modssl.org/

        Caldera security resources:
                http://www.caldera.com/support/security/index.html

        This security fix closes Caldera incidents sr865893, fz521273,
        erg712079.

7. Disclaimer

        Caldera International, Inc. 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 Caldera products.

8. Acknowledgements

        Neel Mehta of the ISS X-Force discovered the Apache
        vulnerability. Mark Litchfield reported the vulnerability
        to the Apache Software Foundation, and Mark Cox reported
        it to the CERT/CC.

        The mod_ssl vulnerability information was obtained from an
        advisory by Frank Denis (jpureftpd.org)

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