Caldera Linux Advisory: OpenSSH

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                Caldera International, Inc.  Security Advisory

Subject:                Linux: OpenSSH ticket and token passing buffer overflow
Advisory number:        CSSA-2002-022.0
Issue date:             2002 May 15
Cross reference:
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1. Problem Description

        A buffer overflow exists in OpenSSH if KerberosTgtPassing or
        AFSTokenPassing has been enabled in the sshd_config file. A
        malicious user, possibly remote, could use this vulnerability
        to gain privileged access to the system.


2. Vulnerable Supported Versions

        System                          Package
        ----------------------------------------------------------------------

        OpenLinux 3.1.1 Server          prior to openssh-2.9p2-6.i386.rpm
                                        prior to openssh-askpass-2.9p2-6.i386.rpm
                                        prior to openssh-server-2.9p2-6.i386.rpm

        OpenLinux 3.1.1 Workstation     prior to openssh-2.9p2-6.i386.rpm
                                        prior to openssh-askpass-2.9p2-6.i386.rpm

        OpenLinux 3.1 Server            prior to openssh-2.9p2-6.i386.rpm
                                        prior to openssh-askpass-2.9p2-6.i386.rpm
                                        prior to openssh-server-2.9p2-6.i386.rpm

        OpenLinux 3.1 Workstation       prior to openssh-2.9p2-6.i386.rpm
                                        prior to openssh-askpass-2.9p2-6.i386.rpm


3. Solution

        The proper solution is to install the latest packages.


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

        f9a494af5e0e6a8eec419f8f94087f7e        openssh-2.9p2-6.i386.rpm
        b9fcc6352bc4c65f63cda1b0caa2b89c        openssh-askpass-2.9p2-6.i386.rpm
        ff4a5bc7e7b1d4fd3f79c647d11d9162        openssh-server-2.9p2-6.i386.rpm

        4.3 Installation

        rpm -Fvh openssh-2.9p2-6.i386.rpm
        rpm -Fvh openssh-askpass-2.9p2-6.i386.rpm
        rpm -Fvh openssh-server-2.9p2-6.i386.rpm

        4.4 Source Package Location

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

        4.5 Source Packages

        ab3e90f4e70fc3eecd7e456fa2c2a97e        openssh-2.9p2-6.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

        3406e8a3e55b52b2eb3e7644327d783c        openssh-2.9p2-6.i386.rpm
        e57817246b56ffdf0322be8afcec08ae        openssh-askpass-2.9p2-6.i386.rpm

        5.3 Installation

        rpm -Fvh openssh-2.9p2-6.i386.rpm
        rpm -Fvh openssh-askpass-2.9p2-6.i386.rpm

        5.4 Source Package Location

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

        5.5 Source Packages

        fde335f6bce93b3a3bf3cc20d8231849        openssh-2.9p2-6.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

        41f489ad60ed068a2a027589ca49e6ea        openssh-2.9p2-6.i386.rpm
        c4b8c1e011708a9e8fa04d927387bde5        openssh-askpass-2.9p2-6.i386.rpm
        3bbb580c64ba83efaeefac20d891148f        openssh-server-2.9p2-6.i386.rpm

        6.3 Installation

        rpm -Fvh openssh-2.9p2-6.i386.rpm
        rpm -Fvh openssh-askpass-2.9p2-6.i386.rpm
        rpm -Fvh openssh-server-2.9p2-6.i386.rpm

        6.4 Source Package Location

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

        6.5 Source Packages

        1c30685cf106f5ee05ec201cd55044f8        openssh-2.9p2-6.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

        45502ddfa3d9bc67eefc2ec6a6bd992a        openssh-2.9p2-6.i386.rpm
        c5bedc4946ee432f66255161ba61bbf5        openssh-askpass-2.9p2-6.i386.rpm

        7.3 Installation

        rpm -Fvh openssh-2.9p2-6.i386.rpm
        rpm -Fvh openssh-askpass-2.9p2-6.i386.rpm

        7.4 Source Package Location

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

        7.5 Source Packages

        5ddea2209f395da08ca715a128e5485a        openssh-2.9p2-6.src.rpm


8. References

        Specific references for this advisory:
                none


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

        Caldera UNIX security resources:
                http://stage.caldera.com/support/security/

        This security fix closes Caldera incidents sr863642, fz520794
        and erg712034.


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

        Marcell Fodor discovered and researched this vulnerability.

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