Описание
Security update for unbound
This update for unbound fixes the following issues:
unbound was updated to 1.20.0:
- A lot of bugfixes and added features. For a complete list take a look at the changelog located at: /usr/share/doc/packages/unbound/Changelog or https://www.nlnetlabs.nl/projects/unbound/download/
Some Noteworthy Changes:
- Removed DLV. The DLV has been decommisioned since unbound 1.5.4 and has been advised to stop using it since. The use of dlv options displays a warning.
- Remove EDNS lame procedure, do not re-query without EDNS after timeout.
- Add DNS over HTTPS
- libunbound has been upgraded to major version 8
Security Fixes:
- CVE-2023-50387: DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers. [bsc#1219823]
- CVE-2023-50868: NSEC3 closest encloser proof can exhaust CPU. [bsc#1219826]
- CVE-2022-30698: Novel 'ghost domain names' attack by introducing subdomain delegations. [bsc#1202033]
- CVE-2022-30699: Novel 'ghost domain names' attack by updating almost expired delegation information. [bsc#1202031]
- CVE-2022-3204: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation Attack). [bsc#1203643]
Packaging Changes:
- Use prefixes instead of sudo in unbound.service
- Remove no longer necessary BuildRequires: libfstrm-devel and libprotobuf-c-devel
Список пакетов
SUSE Linux Enterprise Module for Basesystem 15 SP6
SUSE Linux Enterprise Module for Package Hub 15 SP6
openSUSE Leap 15.6
Ссылки
- Link for SUSE-SU-2024:1923-1
- E-Mail link for SUSE-SU-2024:1923-1
- SUSE Security Ratings
- SUSE Bug 1202031
- SUSE Bug 1202033
- SUSE Bug 1203643
- SUSE Bug 1219823
- SUSE Bug 1219826
- SUSE CVE CVE-2022-30698 page
- SUSE CVE CVE-2022-30699 page
- SUSE CVE CVE-2022-3204 page
- SUSE CVE CVE-2023-50387 page
- SUSE CVE CVE-2023-50868 page
Описание
NLnet Labs Unbound, up to and including version 1.16.1 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 subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.
Затронутые продукты
Ссылки
- CVE-2022-30698
- SUSE Bug 1202031
- SUSE Bug 1202033
Описание
NLnet Labs Unbound, up to and including version 1.16.1, 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 version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.
Затронутые продукты
Ссылки
- CVE-2022-30699
- SUSE Bug 1202031
- SUSE Bug 1202033
Описание
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 version 1.16.3 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.
Затронутые продукты
Ссылки
- CVE-2022-3204
- SUSE Bug 1203643
Описание
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
Затронутые продукты
Ссылки
- CVE-2023-50387
- SUSE Bug 1219823
- SUSE Bug 1220717
- SUSE Bug 1221586
Описание
The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.
Затронутые продукты
Ссылки
- CVE-2023-50868
- SUSE Bug 1219823
- SUSE Bug 1219826
- SUSE Bug 1221586