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                Caldera International, Inc. Security Advisory

Subject: Linux: mod_ssl off-by-one error
Advisory number: CSSA-2002-031.0
Issue date: 2002 July 16
Cross reference:
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1. Problem Description

        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 Package
        ----------------------------------------------------------------------

        OpenLinux 3.1.1 Server prior to mod_ssl-2.8.5_1.3.22-3.i386.rpm
                                        prior to mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        OpenLinux 3.1.1 Workstation prior to mod_ssl-2.8.5_1.3.22-3.i386.rpm
                                        prior to mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        OpenLinux 3.1 Server prior to mod_ssl-2.8.5_1.3.22-3.i386.rpm
                                        prior to mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        OpenLinux 3.1 Workstation prior to mod_ssl-2.8.5_1.3.22-3.i386.rpm
                                        prior to mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

3. Solution

        The proper solution is to install the latest packages. Many
        customers find it easier to use the Caldera System Updater, called
        cupdate (or kcupdate under the KDE environment), to update these
        packages rather than downloading and installing them by hand.

4. OpenLinux 3.1.1 Server

        4.1 Package Location

        ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1.1/Server/current/RPMS

        4.2 Packages

        c998c03318358630584215190a470c9c mod_ssl-2.8.5_1.3.22-3.i386.rpm
        1586b281a0888d306cb5efe35ff86954 mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        4.3 Installation

        rpm -Fvh mod_ssl-2.8.5_1.3.22-3.i386.rpm
        rpm -Fvh mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        4.4 Source Package Location

        ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1.1/Server/current/SRPMS

        4.5 Source Packages

        850ea026cc10315dce3dbaef9feabc8c mod_ssl-2.8.5_1.3.22-3.src.rpm

5. OpenLinux 3.1.1 Workstation

        5.1 Package Location

        ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1.1/Workstation/current/RPMS

        5.2 Packages

        ef912916b08251e9f6b0876a8c052b8f mod_ssl-2.8.5_1.3.22-3.i386.rpm
        d57dae4310139ce3ea0e3979e643a9ac mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        5.3 Installation

        rpm -Fvh mod_ssl-2.8.5_1.3.22-3.i386.rpm
        rpm -Fvh mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        5.4 Source Package Location

        ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1.1/Workstation/current/SRPMS

        5.5 Source Packages

        c34cc1e566f049573dc41b1323849101 mod_ssl-2.8.5_1.3.22-3.src.rpm

6. OpenLinux 3.1 Server

        6.1 Package Location

        ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/RPMS

        6.2 Packages

        3711fdb7fbc8a8f0dd0b5c2408709872 mod_ssl-2.8.5_1.3.22-3.i386.rpm
        0522228a7472586099b91a499a9b2b4f mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        6.3 Installation

        rpm -Fvh mod_ssl-2.8.5_1.3.22-3.i386.rpm
        rpm -Fvh mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        6.4 Source Package Location

        ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/SRPMS

        6.5 Source Packages

        bf52c48ab7e18daa6cea04928fb85419 mod_ssl-2.8.5_1.3.22-3.src.rpm

7. OpenLinux 3.1 Workstation

        7.1 Package Location

        ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Workstation/current/RPMS

        7.2 Packages

        0769c955e7be0acee8a78929cbb9d96c mod_ssl-2.8.5_1.3.22-3.i386.rpm
        4d6773201e7ebd88fb2153e7eaca13b0 mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        7.3 Installation

        rpm -Fvh mod_ssl-2.8.5_1.3.22-3.i386.rpm
        rpm -Fvh mod_ssl-sxnet-2.8.5_1.3.22-3.i386.rpm

        7.4 Source Package Location

        ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Workstation/current/SRPMS

        7.5 Source Packages

        ad1ede2408cf40e319fc647986eca21b mod_ssl-2.8.5_1.3.22-3.src.rpm

8. References

        Specific references for this advisory:
                http://www.modssl.org/

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

        This security fix closes Caldera incidents sr866328, fz521400,
        erg712092.

9. 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.

10. Acknowledgements

        Frank Denis (jpureftpd.org) discovered and researched this
        vulnerability.

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