svn commit: r192595 - in head: crypto/openssh
crypto/openssh/openbsd-compat secure/lib/libssh secure/usr.sbin/sshd
des at des.no
Sun May 24 10:23:32 UTC 2009
Brian Somers <brian at FreeBSD.org> writes:
> Should this be MFCd a little sooner?
Where to begin...
1) ZDNet is about six months behind - this was discovered in November of
2) They also got the numbers wrong; it's 14 bits at 2^-14 chance of
4) They got a lot of other details wrong, including the claim that this
is a "design flaw in OpenSSH". It's a design flaw in the SSH
protocol, and should affect any SSH implementation that uses CBC.
3) It is completely impractical, because every failed attempt kills the
connection, and it takes several thousand attempts to recover
anything at all. In the "how worried should I be" department, it's
about neck and neck with MD5 collisions.
4) If it *does* worry you, adding the following line at the bottom of
/etc/ssh_config and /etc/sshd_config will take care of it:
On systems where you don't have root access, you can add it to the
"Host *" section in your ~/.ssh/config:
Your SSH client / server will then use CBC only if there is no other
Dag-Erling Smørgrav - des at des.no
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