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SuSE: squid remote denial of service Print E-mail
User Rating:      How can I rate this item?
Posted by Benjamin D. Thomas   
SuSE Squid is an Open Source web proxy. A remote attacker was potentially able to crash the Squid web proxy if the log_fqdn option was set to "on" and the DNS replies were manipulated.
______________________________________________________________________________

                        SUSE Security Announcement

        Package:                squid
        Announcement-ID:        SUSE-SA:2005:008
        Date:                   Tue, Feb 22nd 2005 14:30:00 MEST
        Affected products:      8.2, 9.0, 9.1, 9.2
                                SUSE Linux Enterprise Server 8, 9
        Vulnerability Type:     remote denial of service
        Severity (1-10):        4
        SUSE default package:   no
        Cross References:       CAN-2005-0446

    Content of this advisory:
        1) security vulnerability resolved:
             remote denial of service attack
        2) solution/workaround
        3) special instructions and notes
        4) package location and checksums
        5) pending vulnerabilities, solutions, workarounds:
            none

        6) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion

    Squid is an Open Source web proxy.
    
    A remote attacker was potentially able to crash the Squid web proxy
    if the log_fqdn option was set to "on" and the DNS replies were
    manipulated.

    This is tracked by the Mitre CVE ID CAN-2005-0446.

    This update also fixes a defect in the last security update patch
    (CAN-2005-0241).


2) solution/workaround

    Install the fixed packages.

3) special instructions and notes

    Restart the proxy using
    
        /etc/init.d/squid try-restart

4) package location and checksums

    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.

    
    x86 Platform:
    
    SUSE Linux 9.2:
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/squid-2.5.STABLE6-6.8.i586.rpm
           a207ddd1b3700d2a345570b40ffdcb16
    
    SUSE Linux 9.1:
    ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/squid-2.5.STABLE5-42.30.i586.rpm
           8b3f3300e055260ea5a59c8a95f71d42
    
    SUSE Linux 9.0:
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/squid-2.5.STABLE3-120.i586.rpm
           482d3c270c8186d7c4b68d72a50143cc
    
    SUSE Linux 8.2:
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/squid-2.5.STABLE1-108.i586.rpm
           368d091defd189209c0786ac337b92f3
    
    x86-64 Platform:
    
    SUSE Linux 9.2:
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/squid-2.5.STABLE6-6.8.x86_64.rpm
           a1efed588e24a63ff5af8db9a0230c23
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/squid-2.5.STABLE6-6.8.src.rpm
           404c028061fe715b56454a072070f962
    
    SUSE Linux 9.1:
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/squid-2.5.STABLE5-42.30.x86_64.rpm
           78c20bf8fcbb4c07e576d92e6cdaedb4
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/squid-2.5.STABLE5-42.30.src.rpm
           dc8b23cb96e39ea679a07216429e1a72
    
    SUSE Linux 9.0:
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/squid-2.5.STABLE3-120.x86_64.rpm
           b59f02f04ed720bb56fae0e713f6fcbf
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/squid-2.5.STABLE3-120.src.rpm
           4a9072581af98dfc76eaf3c44c88813a


______________________________________________________________________________

5)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    See the SUSE Security Summary Report.

______________________________________________________________________________

6)  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 
       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 
       to verify the signature of the package, where  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-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
                .

    For general information or the frequently asked questions (faq) 
    send mail to:
         or
         respectively.

    =====================================================================
    SUSE's security contact is  or .
@suse.de>.
    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,
    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.
 
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