SUSE Security Advisory: clamav remote code execution (SUSE-SA:2005:055)

26 Sep 2005

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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                clamav
        Announcement ID:        SUSE-SA:2005:055
        Date:                   Mon, 26 Sep 2005 12:00:00 +0000
        Affected Products:      SUSE LINUX 9.1, 9.2, 9.3, 10.0
                                SUSE Linux Enterprise Server 9
        Vulnerability Type:     remote code execution
        Severity (1-10):        5
        SUSE Default Package:   no
        Cross-References:       CAN-2005-2919
                                CAN-2005-2920

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             clamav problems in UPX and FSG EXE compressors
           Problem Description
        2) Solution or Work-Around
        3) Special Instructions and Notes
        4) Package Location and Checksums
        5) Pending Vulnerabilities, Solutions, and Work-Arounds:
            See SUSE Security Summary Report.
        6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

   This update upgrades clamav to version 0.87.

   It fixes vulnerabilities in handling of UPX and FSG compressed executables,
   which could lead to a remote attacker executing code within the daemon
   using clamav.

   These are tracked by the Mitre CVE IDs CAN-2005-2919 and CAN-2005-2920.

   Also following bugs were fixed:
   - Support for PE files, Zip and Cabinet archives has been improved and
     other small bugfixes have been made.
   - The new option "--on-outdated-execute" allows freshclam to run a command
     when system reports a new engine version.

2) Solution or Work-Around

   There is no known workaround, please install the update packages.

3) Special Instructions and Notes

   Make sure you restart all daemons linking against the clamav engine directly
   after the update.

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 <file.rpm>

   to apply the update, replacing <file.rpm> with the filename of the
   downloaded RPM package.

   x86 Platform:

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/clamav-0.87-1.1.i586.rpm
          6c55b69bec8ac76df879610e398c57f5

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/clamav-0.87-1.1.i586.rpm
          51e99e851de3af05a1e10ce5d21d0f8d

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/clamav-0.87-1.2.i586.rpm
          243b8a505a83a1fe449961a1b6dfcff3
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/clamav-0.87-1.2.src.rpm
          95eeec2ea8731c364b10eb50b1d200b9

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/clamav-0.87-1.1.i586.rpm
          45c46b8f2ebb6a097ec253a4f930ee9d

   Power PC Platform:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0-OSS/rpm/ppc/clamav-0.87-1.1.ppc.rpm
          2ba2c1b077598f08c24e4b8d5edee68c

   x86-64 Platform:

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/clamav-0.87-1.1.x86_64.rpm
          db4063e9b447132b6b6fe780d6af54da
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/clamav-0.87-1.1.src.rpm
          d46fadec2816d9577979b67a7f66c282

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/clamav-0.87-1.1.x86_64.rpm
          60b1f27bad3ef7b857bae850c866b011
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/clamav-0.87-1.1.src.rpm
          667c9deb85b25b20dbf01c2b6095791f

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/clamav-0.87-1.2.x86_64.rpm
          fcfc56602da9cb6f7442ba52561d8701
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/clamav-0.87-1.2.src.rpm
          a3a648d1657d1a90132af05996c18241

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/clamav-0.87-1.1.x86_64.rpm
          a40edb865bcd89b302969b1b7df8ead6
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/clamav-0.87-1.1.src.rpm
          e384d8586359dfe548fdc96a4d9f7700

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

   http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/3952d0ed7bf90e0e...
   http://portal.suse.com/psdb/3952d0ed7bf90e0e933aa1ba609705c2.html

______________________________________________________________________________

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

   See SUSE Security Summary Report.
______________________________________________________________________________

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 <file>

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

      gpg: Signature made <DATE> using RSA key ID 3D25D3D9
      gpg: Good signature from "SuSE Security Team <security@suse.de>"

    where <DATE> 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 <file.rpm>

       to verify the signature of the package, replacing <file.rpm> 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 <filename.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
       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-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 e-mail 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>.

    =====================================================================
    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, 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 <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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Marcus Meissner

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