Mandrake: vnc weak cookie vulnerability
Posted by LinuxSecurity.com Team   
Mandrake A vulnerability was discovered in the VNC server script that generates an X cookie, used by X authentication.

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                Mandrake Linux Security Update Advisory
________________________________________________________________________

Package name:           vnc
Advisory ID:            MDKSA-2003:022
Date:                   February 24th, 2003

Affected versions:      7.2, 8.0, 8.1, 8.2, 9.0
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Problem Description:

 A vulnerability was discovered in the VNC server script that generates
 an X cookie, used by X authentication.  The script generated a cookie
 that was not strong enough and allow an attacker to more easily guess
 the authentication cookie, thus obtaining unauthorized access to the
 VNC server.
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References:

   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1336
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1511
   http://marc.theaimsgroup.com/?l=bugtraq&m=102753170201524
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Updated Packages:

 Linux-Mandrake 7.2:
 3146c4c6f64e384c33a9aff0eeb5d819  7.2/RPMS/vnc-3.3.3-8.4mdk.i586.rpm
 826b6681f74eea28f844efbf08067117  7.2/RPMS/vnc-SVGALIB-3.3.3-8.4mdk.i586.rpm
 fee03f7e22977810ea4f018b561ede78  7.2/RPMS/vnc-doc-3.3.3-8.4mdk.i586.rpm
 f099ce837a6838a17d321ba3f1543d54  7.2/RPMS/vnc-java-3.3.3-8.4mdk.i586.rpm
 a4aeb3e5a50688b5dee76716528703e1  7.2/RPMS/vnc-server-3.3.3-8.4mdk.i586.rpm
 01c9676892a4c7f724c80a7f36cc9d96  7.2/SRPMS/vnc-3.3.3-8.4mdk.src.rpm

 Mandrake Linux 8.0:
 a1e0d6fba2678688b695e76f501c656d  8.0/RPMS/vnc-3.3.3r2-9.3mdk.i586.rpm
 61c63cf9ebc8bd6deabeb5c2d7a56903  8.0/RPMS/vnc-doc-3.3.3r2-9.3mdk.i586.rpm
 87748c719607d908bbfa0021e898b6ba  8.0/RPMS/vnc-server-3.3.3r2-9.3mdk.i586.rpm
 a697960631f10567977554f368ed57aa  8.0/SRPMS/vnc-3.3.3r2-9.3mdk.src.rpm

 Mandrake Linux 8.0/PPC:
 b9da27a8401ca2278c1b2fe10ef77f51  ppc/8.0/RPMS/vnc-3.3.3r2-9.3mdk.ppc.rpm
 6c24c434f74d1d6f51eb27acfcf6fef5  ppc/8.0/RPMS/vnc-doc-3.3.3r2-9.3mdk.ppc.rpm
 9b3a85dc77b6f146669f567e1c2e3d61  ppc/8.0/RPMS/vnc-server-3.3.3r2-9.3mdk.ppc.rpm
 a697960631f10567977554f368ed57aa  ppc/8.0/SRPMS/vnc-3.3.3r2-9.3mdk.src.rpm

 Mandrake Linux 8.1:
 37db17f12f368152cac0db078a6fcf63  8.1/RPMS/vnc-3.3.3r2-9.3mdk.i586.rpm
 07e4998f3e4e57d80330afa1f5579fee  8.1/RPMS/vnc-doc-3.3.3r2-9.3mdk.i586.rpm
 1ff141c77d1e6439b43f9c203b5d9bc3  8.1/RPMS/vnc-server-3.3.3r2-9.3mdk.i586.rpm
 a697960631f10567977554f368ed57aa  8.1/SRPMS/vnc-3.3.3r2-9.3mdk.src.rpm

 Mandrake Linux 8.2:
 fcaaa5381979c8a73194adc274d00b23  8.2/RPMS/vnc-3.3.3r2-9.3mdk.i586.rpm
 1317fa06ad1a64e0ebe951a8c44e0daf  8.2/RPMS/vnc-doc-3.3.3r2-9.3mdk.i586.rpm
 dbaceafa1acc5cbb708800938a13c37d  8.2/RPMS/vnc-server-3.3.3r2-9.3mdk.i586.rpm
 a697960631f10567977554f368ed57aa  8.2/SRPMS/vnc-3.3.3r2-9.3mdk.src.rpm

 Mandrake Linux 8.2/PPC:
 679f88500ff0452d1ef3fa98cd7ca837  ppc/8.2/RPMS/vnc-3.3.3r2-9.3mdk.ppc.rpm
 73ab0495076b2603ad18075d4f95ea6e  ppc/8.2/RPMS/vnc-doc-3.3.3r2-9.3mdk.ppc.rpm
 62bfabb7b446495a0062e644507f1c72  ppc/8.2/RPMS/vnc-server-3.3.3r2-9.3mdk.ppc.rpm
 a697960631f10567977554f368ed57aa  ppc/8.2/SRPMS/vnc-3.3.3r2-9.3mdk.src.rpm

 Mandrake Linux 9.0:
 a9f223e4a2515a02801f00a5ecaaa792  9.0/RPMS/tightvnc-1.2.5-2.3mdk.i586.rpm
 5a62077d52ccb402a73779712337413b  9.0/RPMS/tightvnc-doc-1.2.5-2.3mdk.i586.rpm
 6256fa31a62c35b5b2684ae0f43810fd  9.0/RPMS/tightvnc-server-1.2.5-2.3mdk.i586.rpm
 334a42a6597253d6facdc09dcddd21b7  9.0/SRPMS/tightvnc-1.2.5-2.3mdk.src.rpm
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Bug IDs fixed (see https://qa.mandrakesoft.com for more information):
________________________________________________________________________

To upgrade automatically, use MandrakeUpdate.  The verification of md5
checksums and GPG signatures is performed automatically for you.

If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm".  A list of
FTP mirrors can be obtained from:

   http://www.mandrakesecure.net/en/ftp.php

Please verify the update prior to upgrading to ensure the integrity of
the downloaded package.  You can do this with the command:

  rpm --checksig 

All packages are signed by MandrakeSoft for security.  You can obtain
the GPG public key of the Mandrake Linux Security Team from:

  https://www.mandrakesecure.net/RPM-GPG-KEYS
Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other update advisories for Mandrake Linux at:

   http://www.mandrakesecure.net/en/advisories/

MandrakeSoft has several security-related mailing list services that
anyone can subscribe to.  Information on these lists can be obtained by
visiting:

   http://www.mandrakesecure.net/en/mlist.php

If you want to report vulnerabilities, please contact

  security_linux-mandrake.com

Type Bits/KeyID     Date       User ID
pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team