SUSE Linux Information for VU#325603

Integer overflow vulnerability in rsync

Status

Affected

Vendor Statement

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                rsync
       Announcement-ID:        SuSE-SA:2003:050
       Date:                   Thursday, Dec 4th 2003 14:30 MET
       Affected products:      7.3, 8.0, 8.1, 8.2, 9.0
                               SuSE Linux Database Server,
                               SuSE eMail Server III, 3.1
                               SuSE Linux Enterprise Server 7, 8
                               SuSE Linux Firewall on CD/Admin host
                               SuSE Linux Connectivity Server
                               SuSE Linux Office Server
       Vulnerability Type:     local privilege escalation
       Severity (1-10):        4
       SUSE default package:   no
       Cross References:       CAN-2003-0962


    Content of this advisory:
       1) security vulnerability resolved: heap overflow
          problem description, discussion, solution and upgrade information
       2) pending vulnerabilities, solutions, workarounds:
           - discontinue of SuSE Linux 7.3
           - KDE
           - mc
           - apache
           - screen
           - mod_gzip
           - unace
       3) standard appendix (further information)


______________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

    The rsync suite provides client and server tools to easily support an
   administrator keeping the files of different machines in sync.
   In most private networks the rsync client tool is used via SSH to fulfill
   his tasks. In an open environment rsync is run in server mode accepting
   connections from many untrusted hosts with, but mostly without,
   authentication.
   The rsync server drops its root privileges soon after it was started and
   per default creates a chroot environment.
   Due to insufficient integer/bounds checking in the server code a heap
   overflow can be triggered remotely to execute arbitrary code. This code
   does not get executed as root and access is limited to the chroot
   environment. The chroot environment maybe broken afterwards by abusing
   further holes in system software or holes in the chroot setup.


    Your are not vulnerable as long as you do not use rsync in server mode
   or you use authentication to access the rsync server.


    As a temporary workaround you can disable access to your rsync server for
   untrusted parties, enable authentication or switch back to rsync via SSH.


    Please download the update package for your distribution and verify its
   integrity by the methods listed in section 3) of this announcement.
   Then, install the package using the command "rpm -Fhv file.rpm" to apply
   the update.
   Our maintenance customers are being notified individually. The packages
   are being offered to install from the maintenance web.




    Intel i386 Platform:

    SuSE-9.0:
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/rsync-2.5.6-193.i586.rpm
     e848708286572c8a793819e5a358274a
   patch rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/rsync-2.5.6-193.i586.patch.rpm
     d70f7726a2c8850a8c085bdbe9afbf27
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/rsync-2.5.6-193.src.rpm
     45e14417a64704fcee1dfea390a5b3f6


    SuSE-8.2:
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/rsync-2.5.6-193.i586.rpm
     341d1da31000831d994e48d0714b576d
   patch rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/rsync-2.5.6-193.i586.patch.rpm
     d94f1a84fc07e92dfc87471f909314c9
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/rsync-2.5.6-193.src.rpm
     16b19cc2331ff577f2d1f9e116e74625


    SuSE-8.1:
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/rsync-2.5.5-258.i586.rpm
     28799a5950666eb7f104e2831575fb3c
   patch rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/rsync-2.5.5-258.i586.patch.rpm
     02557d2de1dc27ffd97845ebabb336b6
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/rsync-2.5.5-258.src.rpm
     6a7cd73509acf3cca12d9a4f4b3aec98


    SuSE-8.0:
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/rsync-2.4.6-499.i386.rpm
     cf9fde4bcf1f3af3e3c5ae6bf5ceba85
   patch rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/rsync-2.4.6-499.i386.patch.rpm
     0a61425e9bb345fe73e42926408257cb
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/rsync-2.4.6-499.src.rpm
     d5c29841ff1f387cb003c359eee868df


    SuSE-7.3:
   ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/rsync-2.4.6-499.i386.rpm
     67b2400ee15d739e75a1463db7d003ca
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/rsync-2.4.6-499.src.rpm
     ececccdf316a4d98c66315fc560eb9b1




    Sparc Platform:

    SuSE-7.3:
   ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/rsync-2.4.6-190.sparc.rpm
     bd408eb2cfe82206439c78a1fbaecf60
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/rsync-2.4.6-190.src.rpm
     e500422c7cf0dc39c6bb3cf2445d9998




    SuSE-7.3:
   ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/rsync-2.4.6-309.ppc.rpm
     7eebb018bce237a4f351f5e00761ead1
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/rsync-2.4.6-309.src.rpm
     2dd16900d70cbf06454dcd52b822a0ae


______________________________________________________________________________

2)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    - discontinue of SuSE Linux 7.3
   Two years after the release, SUSE will discontinue providing updates
   and security fixes for the SuSE Linux 7.3 consumer product on the
   Intel i386 and the PPC Power PC architectures. Vulnerabilities found
   after December 15th 2003 will not be fixed any more for SuSE Linux
   7.3.
   Directory structures referring to the SuSE Linux 7.3 release will be
   moved to the discontinued/ tree on our main ftp server ftp.suse.com
   the distribution directories first, followed by the update/ directory
   tree in January 2004.
   Please note that our SuSE Linux Enterprise Server family products have
   a much longer support period. These products are not concerned by this
   announcement.


    - KDE
   New KDE packages are currently being tested. These packages fixes
   several vulnerabilities:
     + remote root compromise (CAN-2003-0690)
     + weak cookies (CAN-2003-0692)
     + SSL man-in-the-middle attack
     + information leak through HTML-referrer (CAN-2003-0459)
     + wrong file permissions of config files
   The packages will be release as soon as testing is finished.


    - mc
   By using a special combination of links in archive-files it is possible
   to execute arbitrary commands while mc tries to open it in its VFS.
   The packages are currently tested and will be release as soon as
   possible.


    - apache1/2
   The widely used HTTP server apache has several security vulnerabilities:
     - locally exploitable buffer overflow in the regular expression code.
       The attacker must be able to modify .htaccess or httpd.conf.
       (affects: mod_alias and mod_rewrite)
     - under some circumstances mod_cgid will output its data to the
       wrong client (affects: apache2)
   Update packages are available on our FTP servers.


    - freeradius
   Two vulnerabilities were found in the FreeRADIUS package.
   The remote denial-of-service attack bug was fixed and new packages
   will be released as soon as testing was successfully finished.
   The other bug is a remote buffer overflow in the module rlm_smb.
   We do not ship this module and will fix it for future releases.


    - screen
   A buffer overflow in screen was reported. Since SuSE Linux 8.0
   we do not ship screen with the s-bit anymore. An update package
   will be released for 7.3 as soon as possible.


    - mod_gzip
   The apache module mod_gzip is vulnerable to remote code execution
   while running in debug-mode. We do not ship this module in debug-mode
   but future versions will include the fix.
   Additionally the mod_gzip code was audited to fix more possible security
   related bugs.


    - unace
   The tool unace for handling the archive format ACE is vulnerable to
   a buffer overflow that can be triggered with long file-names as command
   line argument. This only affects unace version 2.5. Unfortunately this
   tool is provided closed source only from the author. Therefore we are
   unable to check for other bugs or look at the patch.
   Update packages are available from our FTP servers.
   
______________________________________________________________________________


3)  standard appendix: authenticity verification, additional information

  - Package authenticity verification:

    SUSE update packages are available on many mirror ftp servers all over
   the world. While this service is being considered valuable and important
   to the free and open source software community, many users wish to be
   sure about the origin of the package and its content before installing
   the package. There are two verification methods that can be used
   independently from each other to prove the authenticity of a downloaded
   file or rpm package:
   1) md5sums as provided in the (cryptographically signed) announcement.
   2) using the internal gpg signatures of the rpm package.


    1) execute the command
       md5sum <name-of-the-file.rpm>
      after you downloaded the file from a SUSE ftp server or its mirrors.
      Then, compare the resulting md5sum with the one that is listed in the
      announcement. Since the announcement containing the checksums is
      cryptographically signed (usually using the key security@suse.de),
      the checksums show proof of the authenticity of the package.
      We disrecommend to subscribe to security lists which cause the
      email message containing the announcement to be modified so that
      the signature does not match after transport through the mailing
      list software.
      Downsides: You must be able to verify the authenticity of the
      announcement in the first place. If RPM packages are being rebuilt
      and a new version of a package is published on the ftp server, all
      md5 sums for the files are useless.


    2) rpm package signatures provide an easy way to verify the authenticity
      of an rpm package. Use the command
       rpm -v --checksig <file.rpm>
      to verify the signature of the package, where <file.rpm> is the
      filename of the rpm package that you have downloaded. Of course,
      package authenticity verification can only target an un-installed rpm
      package file.
      Prerequisites:
       a) gpg is installed
       b) The package is signed using a certain key. The public part of this
          key must be installed by the gpg program in the directory
          ~/.gnupg/ under the user's home directory who performs the
          signature verification (usually root). You can import the key
          that is used by SUSE in rpm packages for SUSE Linux by saving
          this announcement to a file ("announcement.txt") and
          running the command (do "su -" to be root):
           gpg --batch; gpg < announcement.txt | gpg --import
          SUSE Linux distributions version 7.1 and thereafter install the

           key "build@suse.de" upon installation or upgrade, provided that
          the package gpg is installed. The file containing the public key
          is placed at the top-level directory of the first CD (pubring.gpg)
          and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de .



  - SUSE runs two security mailing lists to which any interested party may
   subscribe:


    suse-security@suse.com
       -   general/linux/SUSE security discussion.
           All SUSE security announcements are sent to this list.
           To subscribe, send an email to
               <suse-security-subscribe@suse.com>.


    suse-security-announce@suse.com
       -   SUSE's announce-only mailing list.
           Only SUSE's security announcements are sent to this list.
           To subscribe, send an email to
               <suse-security-announce-subscribe@suse.com>.


    For general information or the frequently asked questions (faq)
   send mail to:
       <suse-security-info@suse.com> or
       <suse-security-faq@suse.com> respectively.


    =====================================================================
   SUSE's security contact is <security@suse.com> or <security@suse.de>.
   The <security@suse.de> public key is listed below.
   =====================================================================
______________________________________________________________________________


    The information in this advisory may be distributed or reproduced,
   provided that the advisory is not modified in any way. In particular,
   it is desired that the clear-text signature shows proof of the
   authenticity of the text.
   SUSE Linux AG makes no warranties of any kind whatsoever with respect
   to the information contained in this security advisory.


Type Bits/KeyID    Date       User ID
pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>


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Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References

None

Addendum

The CERT/CC has no additional comments at this time.

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