Vulnerability Assessment & Network Security Forums
If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Detailed Explanation for this Vulnerability Assessment
Stefan Pfetzing discovered that lshd, a Secure Shell v2 (SSH2)
protocol server, leaks a couple of file descriptors, related to the
randomness generator, to user shells which are started by lshd. A
local attacker can truncate the server's seed file, which may prevent
the server from starting, and with some more effort, maybe also crack
After applying this update, you should remove the server's seed file
(/var/spool/lsh/yarrow-seed-file) and then regenerate it with
"lsh-make-seed --server" as root.
For security reasons, lsh-make-seed really needs to be run from the
console of the system you are running it on. If you run lsh-make-seed
using a remote shell, the timing information lsh-make-seed uses for
its random seed creation is likely to be screwed. If need be, you can
generate the random seed on a different system than that which it will
eventually be on, by installing the lsh-utils package and running
"lsh-make-seed -o my-other-server-seed-file". You may then transfer
the seed to the destination system as using a secure connection.
The old stable distribution (woody) may not be affected by this problem.
For the stable distribution (sarge) this problem has been fixed in
For the unstable distribution (sid) this problem has been fixed in
We recommend that you upgrade your lsh-server package.
Solution : http://www.debian.org/security/2006/dsa-956
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is (C) 2007 Michel Arboi
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