Summary
USN-5626-1 fixed several vulnerabilities in Bind. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory details:
Yehuda Afek, Anat Bremler-Barr, and Shani Stajnrod discovered that Bind
incorrectly handled large delegations. A remote attacker could possibly use
this issue to reduce performance, leading to a denial of service.
(CVE-2022-2795)
It was discovered that Bind incorrectly handled memory when processing
ECDSA DNSSEC verification. A remote attacker could use this issue to
consume resources, leading to a denial of service. (CVE-2022-38177)
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · Pro 14.04 LTS Pro:14.04:LTS | bind9 | 1:9.9.5.dfsg-3ubuntu0.19+esm7 |
| Ubuntu · Pro 16.04 LTS Pro:16.04:LTS | bind9 | 1:9.10.3.dfsg.P4-8ubuntu1.19+esm3 |
Vulnerabilities 2
-
High 7.5
Memory leak in ECDSA DNSSEC verification code
By spoofing the target resolver with responses that have a malformed ECDSA signature, an attacker can trigger a small memory leak. It is possible to gradually erode available memory to the point where named crashes for lack of resources.
-
Medium 5.3
Processing large delegations may severely degrade resolver performance
By flooding the target resolver with queries exploiting this flaw an attacker can significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service.