SuSE: gdm root compromise vulnerability

    Date26 May 2000
    CategorySuSE
    2247
    Posted ByLinuxSecurity Advisories
    An remote adversary could crash gdm or execute his own code, which leads to root compromise of the system running gdm.
    -----BEGIN PGP SIGNED MESSAGE-----
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:  gdm <= 2.0beta4-25
            Date:     Wed May 24 08:35:39 CET 2000
    
            Affected SuSE versions: 6.2-6.4
            Vulnerability Type:     remote compromise
            SuSE default package:   no
            Other affected systems: all linux systems using gdm <= 2.0beta4
    ______________________________________________________________________________
    
    A security hole was discovered in the package mentioned above.
    Please update it 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 GNOME package includes a xdm replacement called gdm for handling
      graphical console and network logins.
      The gdm code, that process' logins over the network, could be tricked
      into writing data from the network right into the stack. This condition
      exists while gdm is running with root privileges and before the user is
      authenticated.
    
    2. Impact
    
      An remote adversary could crash gdm or execute his own code, which
      leads to root compromise of the system running gdm.
    
    3. Solution
    
      By default gdm doesn't accept login connection from the network.
      Older SuSE releases, which include gdm 1.x, allow network logins
      by default but aren't vulnerable by this bug.
      If you need the network login feature of gdm, update the package
      from our FTP server, please.
    
    ______________________________________________________________________________
    
    Please verify these md5 checksums of the updates before installing:
    (For SuSE 6.0, please use the 6.1 updates)
    
    AXP:
    ffb656afe38ee6e5c04789f8fce8b1a8  ftp://ftp.suse.com/pub/suse/axp/update/6.3/gnm2/gdm-2.0beta4-74.alpha.rpm
    f5c7bf9b8fd133e74481ecd6c0d5678e  ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/gdm-2.0beta4-74.src.rpm
    928d262fd9e8f1ff40e6f84b560daf7b  ftp://ftp.suse.com/pub/suse/axp/update/6.4/gnm2/gdm-2.0beta4-74.alpha.rpm
    6f8a0cc01b9b37f5d6b7bf93b138afb2  ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/gdm-2.0beta4-74.src.rpm
    
    i386:
    8a8adfa55587b1db0cf9816e7d8839c6  ftp://ftp.suse.com/pub/suse/i386/update/6.2/gnm2/gdm-2.0beta4-72.i386.rpm
    fea8fda701692bea4fb658edc7a504ea  ftp://ftp.suse.com/pub/suse/i386/update/6.2/zq1/gdm-2.0beta4-72.src.rpm
    be26d14f8693d50002a5462c28a45d5a  ftp://ftp.suse.com/pub/suse/i386/update/6.3/gnm2/gdm-2.0beta4-72.i386.rpm
    bcc226af12ce171d4aa41c6d490d2b8f  ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/gdm-2.0beta4-72.src.rpm
    372583d0633d4d0115e6f3bc8397cf16  ftp://ftp.suse.com/pub/suse/i386/update/6.4/gnm2/gdm-2.0beta4-72.i386.rpm
    33896dd68321aa45c837da34547debf5  ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/gdm-2.0beta4-72.src.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
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                                      Only SuSE's security annoucements are sent
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    To subscribe to the list, send a message to:
         
    
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    _____________________________________________________________________________
    
      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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