Gentoo: vnc Insecure cookie generation
Posted by LinuxSecurity.com Team   
Gentoo The VNC server acts as an X server, but the script for starting itgenerates an MIT X cookie (which is used for X authentication) withoutusing a strong enough random number generator. This could allow anattacker to be able to more easily guess the authentication cookie.

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GENTOO LINUX SECURITY ANNOUNCEMENT 200302-16
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          PACKAGE : vnc
          SUMMARY : insecure cookie generation
             DATE : 2003-02-24 11:35 UTC
          EXPLOIT : remote
VERSIONS AFFECTED : <3.3.6-r1
    FIXED VERSION : 3.3.6-r1

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From Red Hat Security Advisory RHSA-2003:041-12:

"The VNC server acts as an X server, but the script for starting it
generates an MIT X cookie (which is used for X authentication) without
using a strong enough random number generator.  This could allow an
attacker to be able to more easily guess the authentication cookie."

Read the full advisory at:
https://rhn.Red Hat.com/errata/RHSA-2003-041.html

SOLUTION

It is recommended that all Gentoo Linux users who are running
net-misc/vnc upgrade to vnc-3.3.6-r1 as follows:

emerge sync
emerge -u vnc
emerge clean

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aliz@gentoo.org - GnuPG key is available at  http://cvs.gentoo.org/~aliz
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