CVE-2023-32067
Public on 2023-05-23
Modified on 2024-02-07
Description
Denial of Service.
Attack Steps:
The target resolver sends a query
The attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver
The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. (this is only valid for TCP connections, UDP is connection-less)
Current resolution fails, DoS attack is achieved.
Attack Steps:
The target resolver sends a query
The attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver
The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. (this is only valid for TCP connections, UDP is connection-less)
Current resolution fails, DoS attack is achieved.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | c-ares | 2023-06-27 | ALAS-2023-1770 | Fixed |
| Amazon Linux 2 - Core | c-ares | 2023-07-19 | ALAS2-2023-2127 | Fixed |
| Amazon Linux 2023 | c-ares | 2023-06-07 | ALAS2023-2023-198 | Fixed |
| Amazon Linux 2 - Ecs Extra | ecs-service-connect-agent | 2023-09-25 | ALAS2ECS-2023-007 | Fixed |
| Amazon Linux 2023 | ecs-service-connect-agent | 2023-09-20 | ALAS2023-2023-344 | Fixed |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | CVSSv3 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |