AusCERT - ESB-2008.0804 -- [Win][UNIX/Linux] -- Two Security Vulnerabilities in the bzip2(1) Command may Allow the Permissions of Arbitrary Files to be Modified or Allow for Arbitrarily Large Files to be Created

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ESB-2008.0804 -- [Win][UNIX/Linux] -- Two Security Vulnerabilities in the bzip2(1) Command may Allow the Permissions of Arbitrary Files to be Modified or Allow for Arbitrarily Large Files to be Created
Date: 30 June 2008

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             AUSCERT External Security Bulletin Redistribution

                    ESB-2007.0804 -- [Win][UNIX/Linux]
    Two Security Vulnerabilities in the bzip2(1) Command may Allow the
        Permissions of Arbitrary Files to be Modified or Allow for
                   Arbitrarily Large Files to be Created
                               30 June 2008

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              bzip2
Publisher:            Sun Microsystems
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Inappropriate Access
                      Denial of Service
Access:               Existing Account
                      Remote/Unauthenticated
CVE Names:            CVE-2005-1260 CVE-2005-0953

Original Bulletin:  
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-200191-1
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-103118-1

Comment: This advisory references vulnerabilities in products which run on
         platforms other than Solaris. It is recommended that administrators
         running bzip2 check for an updated version of the software for
         their operating system.
         
         This bulletin describes two different vulnerabilities in bzip2.
         The first may allow a user access to files when logs are rotated,
         if those logs are in a world writable directory. Log rotation is
         normally performed at a predictable time by root.

Revision History:     June 30 2008: Resolved bu Sun
                      October 18 2007: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

   Solution Type: Sun Alert
   Solution  200191 :   Two Security Vulnerabilities in the bzip2(1)
   Command may Allow the Permissions of Arbitrary Files to be Modified or
   Allow for Arbitrarily Large Files to be Created          
   Previously Published As: 103118

   Bug ID: 6353235

   Product
   Solaris 9 Operating System
   Solaris 10 Operating System
   Solaris 8 Operating System

   Date of Workaround Release: 16-OCT-2007

   Date of Resolved Release: 27-Jun-2008

   SA Document Body
   A security vulnerability in the bzip2(1) command  (see below for details)

   1. Impact

   A security vulnerability in the bzip2(1) command may allow a local
   unprivileged user to be able to read or modify files owned by another
   local user who invokes bzip2(1) to either compress or decompress files
   in a world writable directory. This could include system files if
   bzip2(1) is issued by a privileged user. [CVE-2005-0953]

   A second security vulnerability in the bzip2(1) command may allow
   arbitrarily large files to be created when decompressing specially
   crafted bzip2(1) archives which may exhaust disk space and could cause
   a Denial of service (DoS). [CVE-2005-1260]

   These issues are described in the following documents:

   CVE-2005-0953 at:
     * http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0953

   CVE-2005-1260 at:
     * http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1260

   2. Contributing Factors

   These issues can occur in the following releases:

   SPARC Platform
     * Solaris 8 without patch 138441-01
     * Solaris 9 without patch 114586-02
     * Solaris 10 without patch 126868-01

   x86 Platform
     * Solaris 8 without patch 138442-01
     * Solaris 9 without patch 114587-02
     * Solaris 10 without patch 126869-02

   Note 1: The file modification issue (CVE-2005-0953) only affects
   versions of bzip2(1) prior to 1.0.4.

   Note 2: The arbitrarily large file issue (CVE-2005-1260) only affects
   versions of bzip2(1) prior to 1.0.3.

   Note 3: The version of bzip2(1) on a system can be determined by
   running the following command:
    $ bzip2 --version
    bzip2, a block-sorting file compressor.  Version 1.0.4, 20-Dec-2006.
    [...]

   3. Symptoms

   If the file modification issue (CVE-2005-0953) has occurred, one or
   more files owned by the user who issued the bzip2(1) command would
   have their permissions changed.

   The symptom of the arbitrarily large file issue (CVE-2005-1260) is the
   bzip2(1) command taking a long amount of time and the output file
   continuously growing in size.
   4. Workaround

   The file modification issue (CVE-2005-0953) can be avoided by not
   compressing or decompressing files using bzip2(1) in world writable
   directories.

   The arbitrarily large file issue (CVE-2005-1260) can be avoided by
   only decompressing bzip2(1) files from trusted sources.
   5. Resolution

   These issues are addressed in the following releases:

   SPARC Platform
     * Solaris 8 with patch 138441-01 or later
     * Solaris 9 with patch 114586-02 or later
     * Solaris 10 with patch 126868-01 or later

   x86 Platform
     * Solaris 8 with patch 138442-01 or later
     * Solaris 9 with patch 114587-02 or later
     * Solaris 10 with patch 126869-02 or later

   Modification History
   27-Jun-2008: Updated Contributing Factors and Resolution sections. Resolved.

   Attachments
   This solution has no attachment


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   References

   1. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0953
   2. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1260
   3. http://www.sun.com/contact/
   4. http://www.sun.com/aboutsun/index.html/
   5. http://www.sun.com/aboutsun/media/index.html
   6. http://www.sun.com/corp_emp/
   7. http://www.sun.com/sitemap/
   8. http://www.sun.com/privacy/
   9. http://www.sun.com/share/text/termsofuse.html
  10. http://www.sun.com/suntrademarks/

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===========================================================================
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