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Gentoo: tightvnc Insecure cookie generation
Posted by LinuxSecurity.com Team
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 200302-15
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PACKAGE : tightvnc
SUMMARY : insecure cookie generation
DATE : 2003-02-24 11:34 UTC
EXPLOIT : remote
VERSIONS AFFECTED : <1.2.8
FIXED VERSION : 1.2.8
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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/tightvnc upgrade to tightvnc-1.2.8 as follows:
emerge sync
emerge -u tightvnc
emerge clean
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aliz@gentoo.org - GnuPG key is available at http://cvs.gentoo.org/~aliz
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