CVE-2021-22946
Published: 15 September 2021
A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.
Notes
| Author | Note |
|---|---|
| mdeslaur | introduced by: https://github.com/curl/curl/commit/ec3bb8f727405 and https://github.com/curl/curl/commit/c5ba0c2f544653 |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
curl Launchpad, Ubuntu, Debian |
bionic |
Released
(7.58.0-2ubuntu3.15)
|
| focal |
Released
(7.68.0-1ubuntu2.7)
|
|
| hirsute |
Released
(7.74.0-1ubuntu2.3)
|
|
| impish |
Released
(7.74.0-1.3ubuntu2)
|
|
| jammy |
Released
(7.74.0-1.3ubuntu2)
|
|
| trusty |
Released
(7.35.0-1ubuntu2.20+esm8)
|
|
| upstream |
Needs triage
|
|
| xenial |
Released
(7.47.0-1ubuntu2.19+esm1)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |