OpenServer 5.0.6 OpenServer 5.0.7 : Xsco contains a buffer overflow that could be exploited to gain root privileges.

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                    SCO Security Advisory

Subject: OpenServer 5.0.6 OpenServer 5.0.7 : Xsco contains a buffer overflow that could be
exploited to gain root privileges.
Advisory number: SCOSA-2004.3
Issue date: 2004 July 29
Cross reference: sr889371 fz528866 erg712547 CAN-2004-0083 CAN-2004-0084 CAN-2004-0106

1. Problem Description

    A buffer overflow in ReadFontAlias from dirfile.c of Xsco
    may allow local users and remote attackers to execute 
    arbitrary code via a font alias file with a long token. 
   
    The Common Vulnerabilities and Exposures project (cve.mitre.org) 
    has assigned the name CAN-2004-0083 to this issue. 
   
    Buffer overflow in the ReadFontAlias function in Xsco,
    when using the CopyISOLatin1Lowered function, may allow
    local or remote authenticated users to execute arbitrary 
    code via a malformed entry in the font alias file. 
   
    The Common Vulnerabilities and Exposures project (cve.mitre.org) 
    has assigned the name CAN-2004-0084 to this issue.
   
    Multiple flaws in reading font files.
   
    The Common Vulnerabilities and Exposures project (cve.mitre.org) 
    has assigned the name CAN-2004-0106 to these issues.
   

2. Vulnerable Supported Versions

    System                          Binaries
    ----------------------------------------------------------------------
    OpenServer 5.0.6                /usr/bin/X11/Xsco
    OpenServer 5.0.7                /usr/bin/X11/Xsco 
   

3. Solution

    The proper solution is to install the latest packages.
   

4. OpenServer 5.0.6

    4.1 Location of Fixed Binaries
   
    ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.3
   
    4.2 Verification
   
    MD5 (VOL.000.000) = 7341b2e45bfc55b838009d8a1c49d000
   
    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:
   
    1) Download the VOL* files to a directory
   
    2) Run the custom command, specify an install from media
    images, and specify the directory as the location of
    the images.
   

5. OpenServer 5.0.7

    5.1 Location of Fixed Binaries
   
    ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.3
   
    The fixes are also available in SCO OpenServer Release 5.0.7
    Maintenance Pack 3 or later.  See
    http://www.sco.com/support/update/download/osr507list.html.
   
    5.2 Verification
   
    MD5 (VOL.000.000) = 7341b2e45bfc55b838009d8a1c49d000
   
    MD5 (507mp3_vol.tar) = c927aefdd50b50aca5d29e08c1562aec
   
    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:
   
    1) Download the VOL* files to the /tmp directory
   
    2) Run the custom command, specify an install from media
    images, and specify the /tmp directory as the location of
    the images.
   
    Or see the Maintenance Pack 3 Release and Installation Notes at
   
    ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.txt
   

6. References

    Specific references for this advisory:
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0083 
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0084
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0106
   
    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 sr889371 fz528866
    erg712547.
   

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

    Greg MacManus (iDEFENSE Labs) is credited with the discovery
    of this vulnerability.  Additionally David Dawes discovered
    further flaws in reading font files.
   

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