OpenLinux: OpenSSH: multiple buffer handling problems

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                        SCO Security Advisory

Subject:                OpenLinux: OpenSSH: multiple buffer handling problems
Advisory number:        CSSA-2003-027.0
Issue date:             2003 October 02
Cross reference:        sr884647 fz528312 erg712429 CERT VU#333628 CERT VU#602204  CAN-2003-0693 CAN-2003-0695 
CAN-2003-0682 CAN-2003-0786 
______________________________________________________________________________


1. Problem Description

        Several buffer management errors and memory bugs are corrected
        by this patch. 
        
        The Common Vulnerabilities and Exposures project (cve.mitre.org) 
        has assigned the following names to these issues. CAN-2003-0693, 
        CAN-2003-0695, CAN-2003-0682, CAN-2003-0786. 
        
        The CERT Coordination Center has assigned the following names 
        VU#333628, and VU#602204. 
        
        CERT VU#333628 / CAN-2003-0693: A "buffer management error" in 
        buffer_append_space of buffer.c for OpenSSH before 3.7 may allow 
        remote attackers to execute arbitrary code by causing an incorrect 
        amount of memory to be freed and corrupting the heap, a different 
        vulnerability than CAN-2003-0695. 
        
        CAN-2003-0695: Multiple "buffer management errors" in OpenSSH before 
        3.7.1 may allow attackers to cause a denial of service or execute 
        arbitrary code using (1) buffer_init in buffer.c, (2) buffer_free 
        in buffer.c, or (3) a separate function in channels.c, a different 
        vulnerability than CAN-2003-0693. 
        
        CAN-2003-0682: "Memory bugs" in OpenSSH 3.7.1 and earlier, with 
        unknown impact, a different set of vulnerabilities than CAN-2003-0693 
        and CAN-2003-0695. 
        
        CERT VU#602204 / CAN-2003-0786: Portable OpenSSH versions 3.7p1
        and 3.7.1p1 contain multiple vulnerabilities in the new PAM
        code. At least one of these bugs is remotely exploitable (under
        a non-standard configuration, with privsep disabled).


2. Vulnerable Supported Versions

        System                          Package
        ----------------------------------------------------------------------
        OpenLinux 3.1.1 Server          prior to openssh-3.7.1p2-1.i386.rpm
                                        prior to openssh-askpass-3.7.1p2-1.i386.rpm
                                        prior to openssh-server-3.7.1p2-1.i386.rpm

        OpenLinux 3.1.1 Workstation     prior to openssh-3.7.1p2-1.i386.rpm
                                        prior to openssh-askpass-3.7.1p2-1.i386.rpm
                                        prior to openssh-server-3.7.1p2-1.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.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-027.0/RPMS
        4.2 Packages

        b221123334fd2dbe93d049038175f91b        openssh-3.7.1p2-1.i386.rpm
        3290dd2b9cacfc1c7188b9a744645123        openssh-askpass-3.7.1p2-1.i386.rpm
        e5f5d9bbbfeb4e97629dae7b2446418f        openssh-server-3.7.1p2-1.i386.rpm

        4.3 Installation

        rpm -Fvh openssh-3.7.1p2-1.i386.rpm
        rpm -Fvh openssh-askpass-3.7.1p2-1.i386.rpm
        rpm -Fvh openssh-server-3.7.1p2-1.i386.rpm

        4.4 Source Package Location

        ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-027.0/SRPMS

        4.5 Source Packages

        19fba72b17344b49390210f7988c3d0f        openssh-3.7.1p2-1.src.rpm


5. OpenLinux 3.1.1 Workstation

        5.1 Package Location

        ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-027.0/RPMS

        5.2 Packages

        ecae4ebd7d44036200fca7f4e7a00c85        openssh-3.7.1p2-1.i386.rpm
        086fd39a605fb8e5332ddeb9ad57d271        openssh-askpass-3.7.1p2-1.i386.rpm
        d1bf2e78daf806738bdedfcef9587830        openssh-server-3.7.1p2-1.i386.rpm

        5.3 Installation

        rpm -Fvh openssh-3.7.1p2-1.i386.rpm
        rpm -Fvh openssh-askpass-3.7.1p2-1.i386.rpm
        rpm -Fvh openssh-server-3.7.1p2-1.i386.rpm

        5.4 Source Package Location

        ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-027.0/SRPMS

        5.5 Source Packages

        3cb08e4470041e84b893618a2df75bf1        openssh-3.7.1p2-1.src.rpm


6. References

        Specific references for this advisory:

        http://www.openssh.com/txt/buffer.adv
        http://www.mindrot.org/pipermail/openssh-unix-announce/2003-September/000063.html
        http://www.freebsd.org/cgi/cvsweb.cgi/~checkout~/ports/security/openssh/files/patch-buffer.c
        http://marc.theaimsgroup.com/?l=openbsd-misc&m=106371592604940
        http://marc.theaimsgroup.com/?l=openbsd-security-announce&m=106375582924840
                
        SCO security resources:
                http://www.sco.com/support/security/index.html

        This security fix closes SCO incidents sr884647 fz528312
        erg712429.


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.
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