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Ubuntu Security Notice USN-6183-1
Ubuntu Security Notice 6183-1 - Shoham Danino, Anat Bremler-Barr, Yehuda Afek, and Yuval Shavitt discovered that Bind incorrectly handled the cache size limit. A remote attacker could possibly use this issue to consume memory, leading to a denial of service. It was discovered that Bind incorrectly handled the recursive-clients quota. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 22.10, and Ubuntu 23.04.
==========================================================================Ubuntu Security Notice USN-6183-1June 21, 2023bind9 vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 23.04- Ubuntu 22.10- Ubuntu 22.04 LTS- Ubuntu 20.04 LTSSummary:Several security issues were fixed in Bind.Software Description:- bind9: Internet Domain Name ServerDetails:Shoham Danino, Anat Bremler-Barr, Yehuda Afek, and Yuval Shavitt discoveredthat Bind incorrectly handled the cache size limit. A remote attacker couldpossibly use this issue to consume memory, leading to a denial of service.(CVE-2023-2828)It was discovered that Bind incorrectly handled the recursive-clientsquota. A remote attacker could possibly use this issue to cause Bind tocrash, resulting in a denial of service. This issue only affected Ubuntu22.04 LTS, Ubuntu 22.10, and Ubuntu 23.04. (CVE-2023-2911)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 23.04: bind9 1:9.18.12-1ubuntu1.1Ubuntu 22.10: bind9 1:9.18.12-0ubuntu0.22.10.2Ubuntu 22.04 LTS: bind9 1:9.18.12-0ubuntu0.22.04.2Ubuntu 20.04 LTS: bind9 1:9.16.1-0ubuntu2.15In general, a standard system update will make all the necessary changes.References: https://ubuntu.com/security/notices/USN-6183-1 CVE-2023-2828, CVE-2023-2911Package Information: https://launchpad.net/ubuntu/+source/bind9/1:9.18.12-1ubuntu1.1 https://launchpad.net/ubuntu/+source/bind9/1:9.18.12-0ubuntu0.22.10.2 https://launchpad.net/ubuntu/+source/bind9/1:9.18.12-0ubuntu0.22.04.2 https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.15Related news
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If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`, a sequence of serve-stale-related lookups could cause `named` to loop and terminate unexpectedly due to a stack overflow. This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.
Every `named` instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the `max-cache-size` statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit. It has been discovered that the effectiveness of the cache-cleaning algorithm used in `named` can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured `max-cache-size` limit to be significantly exceeded. This issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9...