SuSE Security Announcement: sysconfig (SuSE-SA:2002:016)


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______________________________________________________________________________ 

                        SuSE Security Announcement 

        Package: sysconfig 
        Announcement-ID: SuSE-SA:2002:016 
        Date: Wed May 8 12:00:00 MEST 2002 
        Affected products: 8.0 
        Vulnerability Type: remote command execution 
        Severity (1-10): 4 
        SuSE default package: Yes. 
        Other affected systems: No. 

    Content of this advisory: 
        1) security vulnerability resolved: Quotation problem in ifup-dhcp. 
           problem description, discussion, solution and upgrade information 
        2) pending vulnerabilities, solutions, workarounds 
        3) standard appendix (further information) 

______________________________________________________________________________ 

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

    The ifup-dhcp script which is part of the sysconfig package is responsible 
    for setting up network-devices using configuration data obtained from a 
    DHCP server by the dhcpcd DHCP client. It is possible for remote attackers 
    to feed this script with evil data via spoofed DHCP replies for example. 
    This way ifup-dhcp could be tricked into executing arbitrary commands as 
    root. The ifup-dhcp shellscript has been fixed to not source the file 
    containing the possible evil data anymore. 
        Even though the sysconfig package is installed by default, this problem 
    only affects systems with certain dhcp network-setups so only users using 
    DHCP should update their sysconfig package. 

    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. 

    i386 Intel Platform: 

    SuSE-8.0 
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/a1/sysconfig-0.23.14-60.i386.rpm 
      4d6a9f1a3e1a461ebbea9a6e98f4e894 
    source rpm: 
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sysconfig-0.23.14-60.src.rpm 
      d0fdfe02cfc9b7fc32fed8da6c16cf9d 

______________________________________________________________________________ 

2) Pending vulnerabilities in SuSE Distributions and Workarounds: 

    - mozilla/netscape 
    The mozilla browser in version 0.9.7 or higher and the netscape browser 
    in version 6.1 or higher contain a flaw which allows remote sites 
    to read arbitrary files if the user running the browser has the 
    permission to do so. Fixed packages for the mozilla browser will be 
    available soon on our ftp-servers. Patches for the affected netscape 
    browser are not yet available due to missing fixes from Netscape. 

    - xpilot 
    It has been reported that the xpilot server contains a buffer-overflow 
    which allows remote attackers to execute arbitrary commands as the user 
    running the server. The overflow has been fixed and new xpilot packages 
    are available on our ftp-servers. Please update to the newest xpilot 
    packages if you used to run this program. 

______________________________________________________________________________ 

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 uninstalled 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 toplevel 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 annoucements 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 cleartext signature shows proof of the 
    authenticity of the text. 
    SuSE GmbH 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