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Hash: SHA512

Format: 1.8
Date: Wed, 5 Apr 2023 23:28:30 CEST
Source: unbound
Architecture: source
Version: 1.13.1-1+deb11u1
Distribution: bullseye
Urgency: high
Maintainer: unbound packagers <unbound@packages.debian.org>
Changed-By: Markus Koschany <apo@debian.org>
Checksums-Sha1:
191fd7c45fb36719f4921b7277734179c344d7fd 3194 unbound_1.13.1-1+deb11u1.dsc
61326196013301cbfe56adc0010fd898eac39f2e 29448 unbound_1.13.1-1+deb11u1.debian.tar.xz
ba48e86e51f38f835e7001fe28f90421371e846c 10987 unbound_1.13.1-1+deb11u1_amd64.buildinfo
Checksums-Sha256:
af4c16c1dcdb4ddbb60fc7fa2fe927d1e80551dfb60cc19f75adcece33a0f76c 3194 unbound_1.13.1-1+deb11u1.dsc
0e47998afdcb29066c559031c374a3d8eb5b7a7e850a7e347b89304882fcf859 29448 unbound_1.13.1-1+deb11u1.debian.tar.xz
80f007700d9a79c999edeb9426254df462fad91d9cefb2f5337e8d7054268ca9 10987 unbound_1.13.1-1+deb11u1_amd64.buildinfo
Closes: 1016493
Changes:
unbound (1.13.1-1+deb11u1) bullseye; urgency=high
.
* Non-maintainer upload by the LTS team.
* Fix the following security vulnerabilities.
CVE-2022-3204:
A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation
Attack) has been discovered in various DNS resolving software. The
NRDelegation Attack works by having a malicious delegation with a
considerable number of non responsive nameservers. The attack starts by
querying a resolver for a record that relies on those unresponsive
nameservers. The attack can cause a resolver to spend a lot of
time/resources resolving records under a malicious delegation point where a
considerable number of unresponsive NS records reside. It can trigger high
CPU usage in some resolver implementations that continually look in the
cache for resolved NS records in that delegation. This can lead to degraded
performance and eventually denial of service in orchestrated attacks.
Unbound does not suffer from high CPU usage, but resources are still needed
for resolving the malicious delegation. Unbound will keep trying to resolve
the record until hard limits are reached. Based on the nature of the attack
and the replies, different limits could be reached. From now on Unbound
introduces fixes for better performance when under load, by cutting
opportunistic queries for nameserver discovery and DNSKEY prefetching and
limiting the number of times a delegation point can issue a cache lookup
for missing records.
* CVE-2022-30698 and CVE-2022-30699: (Closes: #1016493)
Unbound is vulnerable to a novel type of the "ghost domain names" attack.
The vulnerability works by targeting an Unbound instance. Unbound is
queried for a rogue domain name when the cached delegation information is
about to expire. The rogue nameserver delays the response so that the
cached delegation information is expired. Upon receiving the delayed answer
containing the delegation information, Unbound overwrites the now expired
entries. This action can be repeated when the delegation information is
about to expire making the rogue delegation information ever-updating. From
now on Unbound stores the start time for a query and uses that to decide if
the cached delegation information can be overwritten.
Files:
4e632aaa127d4afb9f1e271e95b9a956 3194 net optional unbound_1.13.1-1+deb11u1.dsc
909796ba0ad4233b21a3ba7ae60788a3 29448 net optional unbound_1.13.1-1+deb11u1.debian.tar.xz
6b19abbdb5f00a0fbaa467e769109831 10987 net optional unbound_1.13.1-1+deb11u1_amd64.buildinfo

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