[Full-Disclosure] UnixWare 7.1.3 Open UNIX 8.0.0 : Xsco contains a buffer overflow that could be exploited to gain root privileges.

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                        SCO Security Advisory

Subject:                UnixWare 7.1.3 Open UNIX 8.0.0 : Xsco contains a buffer 
overflow that could be exploited to gain root privileges.
Advisory number:        SCOSA-2004.2
Issue date:             2004 July 29
Cross reference:        sr889370 fz528865 erg712546 CAN-2004-0083 CAN-2004-0084 
CAN-2004-0106
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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
        ----------------------------------------------------------------------
        UnixWare 7.1.3                  /usr/X/bin/Xsco
        Open UNIX 8.0.0                 /usr/X/bin/Xsco

3. Solution

        The proper solution is to install the latest packages.


4. UnixWare 7.1.3 / Open UNIX 8.0.0

        4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2004.2

        4.2 Verification

        MD5 (erg712546.pkg.Z) = a7ca45fddc3990268e2779a16601b323

        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:

        Download erg712546.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712546.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712546.pkg

5. 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 sr889370 fz528865
        erg712546.


6. 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.


7. 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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