Articles / SuSE: New sudo packages fix…

SuSE: New sudo packages fix race condition

Sudo(8) allows the execution of commands as another user and gives the administrator more flexibility than su(1). A race condition in the pathname handling of sudo may allow a local user to execute arbitrary commands. To exploit this bug some conditions need to be fulfilled. The attacking user needs to be listed in the sudoers file, he is able to create symbolic links in the filesystem, and a ALL alias-command needs to follow the attackers entry. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                       SUSE Security Announcement

       Package:                sudo
       Announcement ID:        SUSE-SA:2005:036
       Date:                   Fri, 24 Jun 2005 12:01:00
       Affected Products:      8.2, 9.0, 9.1, 9.2, 9.3
       Vulnerability Type:     race condition, arbitrary code execution
       Severity (1-10):        5
       SUSE Default Package:   yes
       Cross-References:       CAN-2005-1993

   Content of This Advisory:
       1) Security Vulnerability Resolved:
            race condition in pathname handling
          Problem Description
       2) Solution or Work-Around
       3) Special Instructions and Notes
       4) Package Location and Checksums
       5) Pending Vulnerabilities, Solutions, and Work-Arounds:
           - cacti
           - gaim
           - gedit
           - evolution
           - postgresql
           - quanta
           - kdewebdev3
       6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

  Sudo(8) allows the execution of commands as another user and gives the
  administrator more flexibility than su(1).
  A race condition in the pathname handling of sudo may allow a local user
  to execute arbitrary commands. To exploit this bug some conditions need
  to be fulfilled. The attacking user needs to be listed in the sudoers file,
  he is able to create symbolic links in the filesystem, and a ALL alias-
  command needs to follow the attackers entry.

2) Solution or Work-Around

  It is recommended to install the updated packages.

3) Special Instructions and Notes

  none

4) Package Location and Checksums

  The preferred method for installing security updates is to use the YaST
  Online Update (YOU) tool. YOU detects which updates are required and
  automatically performs the necessary steps to verify and install them.
  Alternatively, download the update packages for your distribution manually
  and verify their integrity by the methods listed in Section 6 of this
  announcement. Then install the packages using the command

    rpm -Fhv 

  to apply the update, replacing  with the filename of the
  downloaded RPM package.

  Our maintenance customers are notified individually. The packages are
  offered for installation from the maintenance web.

  x86 Platform:

  SUSE Linux 9.3:
  ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/sudo-1.6.8p7-3.2.i586.rpm
    b66d5d132049853629a3bcac6ccab485
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/sudo-1.6.8p7-3.2.i586.patch.rpm
    0be64a8e4904a4d291d8829f6b6041c6
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/sudo-1.6.8p7-3.2.src.rpm
    a069125224a78bc300fcd4dcb96e40d3

  SUSE Linux 9.2:
  ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/sudo-1.6.7p5-118.2.i586.rpm
    33bc6c32f618d10f577dab89ea99ece6
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/sudo-1.6.7p5-118.2.i586.patch.rpm
    760a5affabbaa042f4415bbefd6e368e
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/sudo-1.6.7p5-118.2.src.rpm
    e9e3038d21f011fadc8699edd3eeb8cc

  SUSE Linux 9.1:
  ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/sudo-1.6.7p5-117.4.i586.rpm
    a38b0526a497306827d0c80c944cbb29
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/sudo-1.6.7p5-117.4.i586.patch.rpm
    22199f86b112264ca314089bebedfac7
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/sudo-1.6.7p5-117.4.src.rpm
    ad22ffaf4a001e9a5de6a9c619098b15

  SUSE Linux 9.0:
  ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/sudo-1.6.7p5-120.i586.rpm
    d6f2c65abb6ac1ffc869427a261e1c35
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/sudo-1.6.7p5-120.i586.patch.rpm
    cad88b3e9619781af28f2505ac398722
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/sudo-1.6.7p5-120.src.rpm
    1fa8cd28e9c07bbd88674656b8847939

  SUSE Linux 8.2:
  ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/sudo-1.6.6-192.i586.rpm
    aa1a93a017259335bbf87eda21b5e45b
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/sudo-1.6.6-192.i586.patch.rpm
    b507d49bc18be0f2c3c70f41f15f1849
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/sudo-1.6.6-192.src.rpm
    cb3baefafd723842bd9b549762bf68a9



  x86-64 Platform:

  SUSE Linux 9.3:
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.3/rpm/x86_64/sudo-1.6.8p7-3.2.x86_64.rpm
    f4cad71e54f0f56b9fd5257228d3e94d
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.3/rpm/x86_64/sudo-1.6.8p7-3.2.x86_64.patch.rpm
    ac400e62fe3ce21ac7aa6a5e0da79977
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.3/rpm/src/sudo-1.6.8p7-3.2.src.rpm
    a069125224a78bc300fcd4dcb96e40d3

  SUSE Linux 9.2:
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/sudo-1.6.7p5-118.2.x86_64.rpm
    1dea5ee72634fae4c9124fe5926874f4
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/sudo-1.6.7p5-118.2.x86_64.patch.rpm
    eb9db1ea2a1cd7bb3923c4d59774b965
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/sudo-1.6.7p5-118.2.src.rpm
    e9e3038d21f011fadc8699edd3eeb8cc

  SUSE Linux 9.1:
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/sudo-1.6.7p5-117.4.x86_64.rpm
    d3890913e3fb16ef2899aa681d645de0
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/sudo-1.6.7p5-117.4.x86_64.patch.rpm
    fee49fd93b75174c7229fde365fbed74
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/sudo-1.6.7p5-117.4.src.rpm
    b0b4cdd3765249f8f4f80ed17f182259

  SUSE Linux 9.0:
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/sudo-1.6.7p5-120.x86_64.rpm
    f110cef5bb1fba01340235e035d56294
  patch rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/sudo-1.6.7p5-120.x86_64.patch.rpm
    1bfecf26f55a8297d75ff8123ee48f59
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/sudo-1.6.7p5-120.src.rpm
    89a5bcdc68a459b54be612c26bcd1250

______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

  - cacti
    New cacti packages are available soon to fix a SQL injection bug a two
    bugs that can lead to remote command execution.

  - gaim
    New gaim packages are available for download.
    This update fixes the following security problems which allowed
    malicious users to crash other users' gaim client:
      * crashes via malformed MSN malformed message (CAN-2005-1934,
        CAN-2005-1262)
      * crash via specially named file sent via Yahoo (CAN-2005-1269)
      * crash via invalid Jabber file transfer request (CAN-2005-0967)
      * crash via special IRC messages (CAN-2005-0966)
      * crashes via malformed HTML tags (CAN-2005-0965, CAN-2005-0208,
        CAN-2005-0473)
      * crash via malformed SNAC packet sent via AIM/ICQ (CAN-2005-0472)

  - gedit
    Gedit had a format string bug in the filename handling, potentially
    allowing an attacker to execute arbitrary code. This bug has been
    fixed and packages are available on our FTP servers (CAN-2005-1686).

  - evolution
    A denial-of-service bug has been fixed in evolution. New packages can
    be found on our FTP servers.

  - postgresql*
    Updated packages are available on our FTP server.
    This update fixes the following security issues:
      * load arbitrary shared libraries and execute code via the LOAD
        extension (CAN-2005-0227)
      * bypass the EXECUTE permission check for functions by using the
        CREATE AGGREGATE command (CAN-2005-0244)
      * a heap based buffer overflow (CAN-2005-0245)
      * denial of service through intagg contrib module (CAN-2005-0246)
      * execute arbitrary code due to bugs in several SQL commands
        (CAN-2005-0247, CAN-2005-1409, CAN-2005-1410)
    This update also fixes the following non-security issues:
      * A race condition that allowed a transaction to be seen as
        committed for some purposes (eg SELECT FOR UPDATE) slightly
        sooner than for other purposes.

  - quanta/kdewebdev3
    Kommander executed scripts from untrusted sources without further
    checking. This has been disabled now.
    New packages are available.

______________________________________________________________________________

6) Authenticity Verification and Additional Information

 - Announcement authenticity verification:

   SUSE security announcements are published via mailing lists and on Web
   sites. The authenticity and integrity of a SUSE security announcement is
   guaranteed by a cryptographic signature in each announcement. All SUSE
   security announcements are published with a valid signature.

   To verify the signature of the announcement, save it as text into a file
   and run the command

     gpg --verify 

   replacing  with the name of the file where you saved the
   announcement. The output for a valid signature looks like:

     gpg: Signature made  using RSA key ID 3D25D3D9
     gpg: Good signature from "SuSE Security Team "

   where  is replaced by the date the document was signed.

   If the security team's key is not contained in your key ring, you can
   import it from the first installation CD. To import the key, use the
   command

     gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

 - Package authenticity verification:

   SUSE update packages are available on many mirror FTP servers all over the
   world. While this service is considered valuable and important to the free
   and open source software community, the authenticity and the integrity of
   a package needs to be verified to ensure that it has not been tampered
   with.

   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) Using the internal gpg signatures of the rpm package
   2) MD5 checksums as provided in this announcement

   1) The internal rpm package signatures provide an easy way to verify the
      authenticity of an RPM package. Use the command

       rpm -v --checksig 

      to verify the signature of the package, replacing  with the
      filename of the RPM package downloaded. The package is unmodified if it
      contains a valid signature from build@suse.de with the key ID 9C800ACA.

      This key is automatically imported into the RPM database (on
      RPMv4-based distributions) and the gpg key ring of 'root' during
      installation. You can also find it on the first installation CD and at
      the end of this announcement.

   2) If you need an alternative means of verification, use the md5sum
      command to verify the authenticity of the packages. Execute the command

        md5sum 

      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
      SUSE security announcement. Because the announcement containing the
      checksums is cryptographically signed (by security@suse.de), the
      checksums show proof of the authenticity of the package if the
      signature of the announcement is valid. Note that the md5 sums
      published in the SUSE Security Announcements are valid for the
      respective packages only. Newer versions of these packages cannot be
      verified.

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

   suse-security@suse.com
       -   General Linux and SUSE security discussion.
           All SUSE security announcements are sent to this list.
           To subscribe, send an e-mail to
               .

   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 e-mail to
               .

   For general information or the frequently asked questions (FAQ),
   send mail to  or
   .

   =====================================================================
   SUSE's security contact is  or .
   The  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, the
   clear text signature should show proof of the authenticity of the text.

   SUSE Linux Products GmbH provides 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 
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key 

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