Articles / SuSE: New cvs packages fix …

SuSE: New cvs packages fix remote code execution

The Concurrent Versions System (CVS) offers tools which allow developers to share and maintain large software projects. During the analyzation of the CVS protocol and their implementation, the SuSE Security Team discovered a flaw within the handling of pathnames. Evil CVS servers could specify absolute pathnames during checkouts and updates, which allows to create arbitrary files with the permissions of the user invoking the CVS client. This could lead to a compromise of the system. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                cvs
        Announcement-ID:        SuSE-SA:2004:008
        Date:                   Wed Apr 14 16:00:00 MEST 2004
        Affected products:      8.0, 8.1, 8.2, 9.0
                                SuSE Firewall on CD 2
                                SuSE Linux Enterprise Server 7, 8
                                SLES 8 for IBM iSeries and IBM pSeries
                                SuSE Linux Office Server
                                UnitedLinux 1.0
        Vulnerability Type:     remote code execution
        Severity (1-10):        5
        SUSE default package:   No
        Cross References:       

    Content of this advisory:
        1) security vulnerability resolved: arbitrary file creation in cvs
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - neon
            - tcpdump
            - openssh
            - kdeprint/kdelibs3
            - MPlayer
            - mailman
            - systat
            - apache2
            - emil
        3) standard appendix (further information)

______________________________________________________________________________

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

    The Concurrent Versions System (CVS) offers tools which allow developers
    to share and maintain large software projects.
      During the analyzation of the CVS protocol and their implementation, the
    SuSE Security Team discovered a flaw within the handling of pathnames.
    Evil CVS servers could specify absolute pathnames during checkouts and
    updates, which allows to create arbitrary files with the permissions of
    the user invoking the CVS client. This could lead to a compromise of the
    system.

    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/cvs-1.11.6-79.i586.rpm
      392353d02948dee01fa98832841699be
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/cvs-1.11.6-79.i586.patch.rpm
      fd287ccde902d5a93ce54c141f4f888d
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/cvs-1.11.6-79.src.rpm
      f094e09f54e176747f7441d44c20e12c

    SuSE-8.2:
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/cvs-1.11.5-103.i586.rpm
      a690613adaf637365f8b99a91373f5cf
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/cvs-1.11.5-103.i586.patch.rpm
      844400ec62905d78b9e196c311f49207
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/cvs-1.11.5-103.src.rpm
      202d2afd939caff003fbe73f65977ee6

    SuSE-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cvs-1.11.1p1-326.i586.rpm
      90401ed5771c3570310c23efcd503bee
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cvs-1.11.1p1-326.i586.patch.rpm
      42335546a7937ccc0fc6173ba1697ed9
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/cvs-1.11.1p1-326.src.rpm
      ca6cb008ba8004635f9892552ed3e569

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/cvs-1.11.1p1-326.i386.rpm
      b24bca587706433d0cfa81ae96822e81
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/cvs-1.11.1p1-326.i386.patch.rpm
      b5df706c6862ade002714607ba6027f6
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/cvs-1.11.1p1-326.src.rpm
      26b4e34fb562fdccf33f35bfde16a403


    Opteron x86_64 Platform:

    SuSE-9.0:
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/cvs-1.11.6-78.x86_64.rpm
      dae12f94ea7eb35ed9b5172a8288d032
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/cvs-1.11.6-78.x86_64.patch.rpm
      07ca7acf86abd38e617a60e28dedfb0c
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/cvs-1.11.6-78.src.rpm
      02d1e7f89a0f5372dc8a702032f4f4c2

______________________________________________________________________________

2)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    - neon
    The neon package contained various format string vulnerabilities
    which have been fixed. New packages are available on our FTP servers.
    Maintained products do not contain the neon package and are therefore
    not affected. (CAN-2004-0179)

    - tcpdump
    The tcpdump program contains a remotely exploitable denial of service
    condition in its ISAKMP packet handling. New tcpdump packages are
    currently being tested and will soon be available on our FTP servers.

    - openssh
    The scp program which is part of the openssh package allowed evil
    servers to trick clients into creating arbitrary files with
    permissions of the user invoking scp. New packages are available on
    our FTP servers.

    - kdeprint/kdelibs3
    The kdeprint system called the ghostscript program without the -dSAFER
    option. This has been fixed. New packages are available on our FTP
    servers. The package is named "kdelibs3". Maintained products are
    not affected.

    - MPlayer
    The mplayer program contained a buffer overflow while escaping
    large URLs. This has been fixed. New MPlayer packages are currently
    being tested and will be available soon on our FTP servers.

    - mailman
    The mailing list manager mailman can be tricked to deny service by
    remote attackers. (CAN-2003-0991)
    New packages are available on our FTP servers.

    - sysstat
    This update close two cases of insecure temporary file handling in
    the isag code.
    New packages are available on our FTP servers.

    - apache2
    This update fixes a memory leak in the mod_ssl module of apache2
    (CAN-2004-0113), a possible remote DoS attack on accessing rarely
    used listening ports (CAN-2004-0174), and a problem with unescaped
    special characters in log files that could present a security hazard
    for terminal emulators (CAN-2003-0020).
    New packages are available on our FTP servers.

    - emil
    The emil mail filter conatins buffer overflows and format-string
    bugs that can be exploited remotely if emil is used in conjunction
    with procmail, sendmail and alike. (CAN-2004-0152, CAN-2004-0153)
    New packages are available on 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 
       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 .
    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.

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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-- 
~
~ perl self.pl
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
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