Xinet K-Talk Appletalk(tm) xkas vulnerability on IRIX

2002-06-12T00:00:00
ID SECURITYVULNS:DOC:3056
Type securityvulns
Reporter Securityvulns
Modified 2002-06-12T00:00:00

Description

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                      SGI Security Advisory

    Title:      Xinet K-Talk Appletalk(tm) xkas vulnerability
    Number:     20020604-01-I
    Date:       June 10, 2002
    Reference:  CAN-2002-0213


  • --- Issue Specifics ---

It's been reported that the Appletalk(tm) package supplied on the Applications CD with IRIX 6.5 creates a world writeable directory (/var/adm/appletalk/icons/) that can allow a malicious user to read any file on the system through the use of the xkas Appletalk administration tool.

http://archives.neohapsis.com/archives/bugtraq/2002-01/0329.html

While the version of Appletalk that is shipped with IRIX does not contain the xkas binary, circumstances do exist where this world writable directory might be exploited.

SGI has investigated the issue and recommends the following steps for neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be implemented on ALL vulnerable SGI systems.

These issues have been corrected in the Applications CD supplied with IRIX 6.5.16.


  • --- Impact ---

The Appletalk package is an optional package supplied with IRIX 6.5 on the Applications CD. It is not installed by default, and is supplied as a demo package only. It is not supported by SGI.

To determine the version of IRIX you are running, execute the following command:

# uname -R

That will return a result similar to the following:

# 6.5 6.5.15f

The first number ("6.5") is the release name, the second ("6.5.15f" in this case) is the extended release name. The extended release name is the "version" we refer to throughout this document.

To see if Appletalk is installed, execute the following command:

$ versions -b | grep appletalk I appletalk 11/05/1999 Xinet Macintosh Connectivity 9.02

If a line similar to the one shown is returned, then appletalk is installed and the system is possibly vulnerable.

This vulnerability was assigned the following CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0213


  • --- Solution ---

Check the permissions and ownership of the /var/adm/appletalk/icons directory:

$ ls -ld /var/adm/appletalk/icons

If it looks like this:

drwxrwxrwx 3 root sys 68 Nov 5 1999 /var/adm/appletalk/icons/

...then you need to remove the world-writeable permissions. Execute the following commands:

$ su - $ chmod o-w /var/adm/appletalk/icons $ exit

Check to see that the world-writeable permissions have been removed:

$ ls -ld /var/adm/appletalk/icons

...it should now look like this:

drwxrwxr-x 3 root sys 68 Nov 5 1999 /var/adm/appletalk/icons/

Once the above steps have been performed, the vulnerability has been removed. It is not necessary to reboot the system after doing this.

SGI has not provided patches for this vulnerability. Please follow the procedure above to secure your system. This vulnerability has been corrected on the Applications CD supplied with IRIX 6.5.16.

OS Version Vulnerable? Patch # Other Actions ---------- ----------- ------- ------------- IRIX 3.x unknown Note 1 IRIX 4.x unknown Note 1 IRIX 5.x unknown Note 1 IRIX 6.0.x unknown Note 1 IRIX 6.1 unknown Note 1 IRIX 6.2 unknown Note 1 IRIX 6.3 unknown Note 1 IRIX 6.4 unknown Note 1 IRIX 6.5 yes Notes 2 & 3 IRIX 6.5.1 yes Notes 2 & 3 IRIX 6.5.2 yes Notes 2 & 3 IRIX 6.5.3 yes Notes 2 & 3 IRIX 6.5.4 yes Notes 2 & 3 IRIX 6.5.5 yes Notes 2 & 3 IRIX 6.5.6 yes Notes 2 & 3 IRIX 6.5.7 yes Notes 2 & 3 IRIX 6.5.8 yes Notes 2 & 3 IRIX 6.5.9 yes Notes 2 & 3 IRIX 6.5.10 yes Notes 2 & 3 IRIX 6.5.11 yes Notes 2 & 3 IRIX 6.5.12 yes Notes 2 & 3 IRIX 6.5.13 yes Notes 2 & 3 IRIX 6.5.14 yes Notes 2 & 3 IRIX 6.5.15 yes Notes 2 & 3 IRIX 6.5.16 no

NOTES

 1) This version of the IRIX operating has been retired. Upgrade to an
    actively supported IRIX operating system.  See
    http://support.sgi.com/irix/news/index.html#policy for more
    information.

 2) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your
    SGI Support Provider or URL: http://support.sgi.com/irix/swupdates/

 3) Follow the procedure outlined above to secure your system.

  • --- Acknowledgments ----

SGI wishes to thank HACKERSLAB and the users of the Internet Community at large for their assistance in this matter.


  • --- Links ---

SGI Security Advisories can be found at: http://www.sgi.com/support/security/ and ftp://patches.sgi.com/support/free/security/advisories/

SGI Security Patches can be found at: http://www.sgi.com/support/security/ and ftp://patches.sgi.com/support/free/security/patches/

SGI patches for IRIX can be found at the following patch servers: http://support.sgi.com/irix/ and ftp://patches.sgi.com/

SGI freeware updates for IRIX can be found at: http://freeware.sgi.com/

SGI fixes for SGI open sourced code can be found on: http://oss.sgi.com/projects/

SGI patches and RPMs for Linux can be found at: http://support.sgi.com/linux/ or http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/

SGI patches for Windows NT or 2000 can be found at: http://support.sgi.com/nt/

IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at: http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/

IRIX 6.5 Maintenance Release Streams can be found at: http://support.sgi.com/colls/patches/tools/relstream/index.html

IRIX 6.5 Software Update CDs can be obtained from: http://support.sgi.com/irix/swupdates/

The primary SGI anonymous FTP site for security advisories and patches is patches.sgi.com (216.32.174.211). Security advisories and patches are located under the URL ftp://patches.sgi.com/support/free/security/

For security and patch management reasons, ftp.sgi.com (mirrors patches.sgi.com security FTP repository) lags behind and does not do a real-time update.


  • --- SGI Security Information/Contacts ---

If there are questions about this document, email can be sent to security-info@sgi.com.

                  ------oOo------

SGI provides security information and patches for use by the entire SGI community. This information is freely available to any person needing the information and is available via anonymous FTP and the Web.

The primary SGI anonymous FTP site for security advisories and patches is patches.sgi.com (216.32.174.211). Security advisories and patches are located under the URL ftp://patches.sgi.com/support/free/security/

The SGI Security Headquarters Web page is accessible at the URL: http://www.sgi.com/support/security/

For issues with the patches on the FTP sites, email can be sent to security-info@sgi.com.

For assistance obtaining or working with security patches, please contact your SGI support provider.

                  ------oOo------

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In the example above, <YourEmailAddress> is the email address that you wish the mailing list information sent to. The word end must be on a separate line to indicate the end of the body of the message. The control-d (^d) is used to indicate to the mail program that you are finished composing the mail message.

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SGI provides a comprehensive customer World Wide Web site. This site is located at http://www.sgi.com/support/security/ .

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If there are general security questions on SGI systems, email can be sent to security-info@sgi.com.

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  This information is provided freely to all interested parties
  and may be redistributed provided that it is not altered in any
  way, SGI is appropriately credited and the document retains and
  includes its valid PGP signature.

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