SuSE 6.x: Kernel vulnerability

    Date17 May 2000
    CategorySuSE
    2142
    Posted ByLinuxSecurity Advisories
    A method to bypass ipchains masquerading exists and an update has been issued.
    -----BEGIN PGP SIGNED MESSAGE-----
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package: kernel < 2.2.15
            Date:    Wed, 17 May 2000 18:24:50 GMT
    
            Affected SuSE versions: 6.1 - 6.4
            Vulnerability Type:     bypass ipchains filter rules
                                    denial of service
            SuSE default package:   yes
            Other affected systems: all linux versions using kernel 2.2.x and
                                    several stateful firewall packages
    ______________________________________________________________________________
    
    A security hole was discovered in the package mentioned above.
    Please update as soon as possible or disable the service if you are using
    this software on your SuSE Linux installation(s).
    
    Other Linux distributions or operating systems might be affected as
    well, please contact your vendor for information about this issue.
    
    Please note that we provide this information on an "as-is" basis only.
    There is no warranty whatsoever and no liability for any direct, indirect or
    incidental damage arising from this information or the installation of
    the update package.
    _____________________________________________________________________________
    
    1. Problem Description
    
      The masquerading feature in the Linux kernel has got a vulnerability in
      the udp and ftp masquerading code which allows arbitary backward
      connections to be opened.
      Some denial of service were found.
    
    2. Impact
    
      Remote users may bypass ipchains filter rules protecting the internal
      network.
      Users can crash the machine.
    
    3. Solution
    
      Update the package from our FTP server.
      Please note that we provide a patched 2.2.14 kernel to ensure stability
      and not the 2.2.15 kernel.
    ______________________________________________________________________________
    
    Please verify these md5 checksums of the updates before installing:
    (NOTE: the 6.4 updates fit 6.1 to 6.3 as well)
    
    765e268875a7716f681c14389a1c9b9b  ftp://ftp.suse.com/pub/suse/i386/update/6.4/kernel/k_deflt.rpm
    be6ee213f0cafd4dac5c51a2a8d100f0  ftp://ftp.suse.com/pub/suse/i386/update/6.4/kernel/k_eide.rpm
    b900eb9f47c94df5cc15721e5f96a58e  ftp://ftp.suse.com/pub/suse/i386/update/6.4/kernel/k_i386.rpm
    37deca6ee856c3242a13c2a24f32fc7f  ftp://ftp.suse.com/pub/suse/i386/update/6.4/d1/lx_suse-2.2.14.SuSE-24.i386.rpm
    ______________________________________________________________________________
    
    You can find updates on our ftp-Server:
    
      ftp://ftp.suse.com/pub/suse/i386/update for Intel processors
      ftp://ftp.suse.com/pub/suse/axp/update  for Alpha processors
    
    or try the following web pages for a list of mirrors:
      http://www.suse.de/ftp.html
      http://www.suse.com/ftp_new.html
    
    Our webpage for patches:
      http://www.suse.de/patches/index.html
    
    Our webpage for security announcements:
      http://www.suse.de/security
    
    If you want to report vulnerabilities, please contact
      This email address is being protected from spambots. You need JavaScript enabled to view it.
    ______________________________________________________________________________
    
    SuSE has got two free security mailing list services to which any
    interested party may subscribe:
    
    This email address is being protected from spambots. You need JavaScript enabled to view it.          - moderated and for general/linux/SuSE
                                      security discussions. All SuSE security
                                      announcements are sent to this list.
    
    This email address is being protected from spambots. You need JavaScript enabled to view it. - SuSE's announce-only mailing list.
                                      Only SuSE's security annoucements are sent
                                      to this list.
    
    To subscribe to the list, send a message to:
         
    
    To remove your address from the list, send a message to:
         
    
    Send mail to the following for info and FAQ for this list:
         
         
    
    _____________________________________________________________________________
    
      This information is provided freely to everyone interested and may
      be redistributed provided that it is not altered in any way.
    
    Type Bits/KeyID    Date       User ID
    pub  2048/3D25D3D9 1999/03/06 SuSE Security Team 
    
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