Security Update: [CSSA-2002-SCO.42] UnixWare 7.1.1 Open UNIX 8.0.0 : in.talkd format string vulnerabilities

To: [email protected] [email protected] [email protected]
[email protected]

                    SCO Security Advisory

Subject: UnixWare 7.1.1 Open UNIX 8.0.0 : in.talkd format string
vulnerabilities
Advisory number: CSSA-2002-SCO.42
Issue date: 2002 November 12
Cross reference:

1. Problem Description

     The in.talkd program is vulnerable to a format string bug
     which can be exploited remotely. An attacker can request
     a talk session with a crafted luser field and be able to
     write memory and gain control of the flow of the in.talkd.
     This vulnerability can also be exploited with the clt_addr
     field and its resolved name (in conjuction with a DNS).
   

2. Vulnerable Supported Versions

    System                          Binaries
    ----------------------------------------------------------------------
    UnixWare 7.1.1                  /usr/sbin/in.otalkd
                                    /usr/sbin/in.talkd
    Open UNIX 8.0.0                 /usr/sbin/in.otalkd
                                    /usr/sbin/in.talkd
   

3. Solution

    The proper solution is to install the latest packages.
   

4. UnixWare 7.1.1

    4.1 Location of Fixed Binaries
   
    ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.42
   
   
    4.2 Verification
   
    MD5 (erg712055.pkg.Z) = 5cd91b194857bb3149efee8bf6e3e804
   
    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 erg712055.pkg.Z to the /var/spool/pkg directory
   
    # uncompress /var/spool/pkg/erg712055.pkg.Z
    # pkgadd -d /var/spool/pkg/erg712055.pkg
   

5. Open UNIX 8.0.0

    5.1 Location of Fixed Binaries
   
    ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.42
   
   
    5.2 Verification
   
    MD5 (erg712055.pkg.Z) = 5cd91b194857bb3149efee8bf6e3e804
   
    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:
   
    Download erg712055.pkg.Z to the /var/spool/pkg directory
   
    # uncompress /var/spool/pkg/erg712055.pkg.Z
    # pkgadd -d /var/spool/pkg/erg712055.pkg
   

6. References

    Specific references for this advisory:
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-1010
            http://www.ngsec.com/docs/advisories/NGSEC-2002-3.txt
   
    SCO security resources:
            http://www.sco.com/support/security/index.html
   
    This security fix closes SCO incidents sr864879, fz521053,
    erg712055.
   

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. Acknowledgements

    It is difficult to say who actually discovered this
    vulnerability. There are many candidates.