CVE-2023-28320
Published: 17 May 2023
A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for resolving host names, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.
Notes
| Author | Note |
|---|---|
| mdeslaur | Ubuntu is not vulnerable to this issue as packages are built with the threaded resolver, not the synchronous resolver. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
curl Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not compiled)
|
| focal |
Not vulnerable
(code not compiled)
|
|
| jammy |
Not vulnerable
(code not compiled)
|
|
| kinetic |
Not vulnerable
(code not compiled)
|
|
| lunar |
Not vulnerable
(code not compiled)
|
|
| trusty |
Not vulnerable
(code not compiled)
|
|
| upstream |
Released
(8.1.0)
|
|
| xenial |
Not vulnerable
(code not compiled)
|
|
|
Patches: upstream: https://github.com/curl/curl/commit/13718030ad4b3209a7583b |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |