Created attachment 195626 [details]
patch to upgrade
NSD versions 4.1.22 and before are vulnerable in comparing TSIG
information and this can be used to discover a TSIG secret.
NSD uses TSIG to protect zone transfers. The TSIG code uses a secret
key to protect the data. The secret key is shared with both sides of
the zone transfer connection. The comparison code in NSD was not time
insensitive, causing the potential for an attacker to use timing
information to discover data about the key contents.
NSD versions from 2.2.0 to 4.1.22 are vulnerable. Upgrade to 4.1.23 or
newer to get the fix.
There is no known exploit.
It was reported by Ondrej Sury (ISC).
A commit references this bug:
Date: Mon Jul 30 13:59:50 UTC 2018
New revision: 475892
dns/nsd upgrade to version 4.1.23
Submitted by: jaap@NLnetLabs.nl (maintainer)