CVE-2023-2828
Publication date 21 June 2023
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
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 9.18.11-S1 through 9.18.15-S1.
Status
Package | Ubuntu Release | Status |
---|---|---|
bind9 | 24.04 LTS noble |
Fixed 1:9.18.12-1ubuntu2
|
22.04 LTS jammy |
Fixed 1:9.18.12-0ubuntu0.22.04.2
|
|
20.04 LTS focal |
Fixed 1:9.16.1-0ubuntu2.15
|
|
18.04 LTS bionic |
Fixed 1:9.11.3+dfsg-1ubuntu1.19+esm1
|
|
16.04 LTS xenial |
Fixed 1:9.10.3.dfsg.P4-8ubuntu1.19+esm6
|
|
14.04 LTS trusty |
Fixed 1:9.9.5.dfsg-3ubuntu0.19+esm10
|
|
bind9-libs | 24.04 LTS noble | Not in release |
22.04 LTS jammy |
Needs evaluation
|
|
20.04 LTS focal |
Needs evaluation
|
|
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
isc-dhcp | 24.04 LTS noble |
Needs evaluation
|
22.04 LTS jammy |
Not affected
|
|
20.04 LTS focal |
Not affected
|
|
18.04 LTS bionic |
Needs evaluation
|
|
16.04 LTS xenial |
Not affected
|
|
14.04 LTS trusty |
Not affected
|
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alexmurray
As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs
mdeslaur
This is unlikely to affect isc-dhcp's use of bind9-libs and the vendored bind9 libs, marking as negligible
Patch details
Package | Patch details |
---|---|
bind9 |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 · High |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-6183-1
- Bind vulnerabilities
- 21 June 2023
- USN-6183-2
- Bind vulnerability
- 18 July 2023