CVE-2023-32067
Published: 25 May 2023
c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a 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 issue has been patched in version 1.19.1.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
c-ares Launchpad, Ubuntu, Debian |
bionic |
Released
(1.14.0-1ubuntu0.2+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
| focal |
Released
(1.15.0-1ubuntu0.3)
|
|
| jammy |
Released
(1.18.1-1ubuntu0.22.04.2)
|
|
| kinetic |
Released
(1.18.1-1ubuntu0.22.10.2)
|
|
| lunar |
Released
(1.18.1-2ubuntu0.1)
|
|
| mantic |
Not vulnerable
(1.18.1-3)
|
|
| trusty |
Ignored
(end of standard support)
|
|
| upstream |
Released
(1.19.1,1.18.1-3)
|
|
| xenial |
Released
(1.10.0-3ubuntu0.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
|
Patches: upstream: https://github.com/c-ares/c-ares/commit/b9b8413cfdb70a3f99e1573333b23052d57ec1ae |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| 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 |