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Debian Security Advisory DSA 956-1 (lsh-utils)

Information

Severity

Severity

Low

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

3.6

CVSSv2 Vector

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:N/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

14 years ago

Modified

Modified

5 years ago

Summary

The remote host is missing an update to lsh-utils announced via advisory DSA 956-1. 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 session keys. 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.

Solution

Solution

For the stable distribution (sarge) this problem has been fixed in version 2.0.1-3sarge1. For the unstable distribution (sid) this problem has been fixed in version 2.0.1cdbs-4. We recommend that you upgrade your lsh-server package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20956-1

Common Vulnerabilities and Exposures (CVE)