CVE-2021-22947
Published: 15 September 2021
When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.
Notes
Author | Note |
---|---|
alexmurray | Originally introduced via https://github.com/curl/curl/commit/ec3bb8f727405 - affects versions between and including 7.20.0 and 7.78.0 - patch in Message-ID: <nycvar.QRO.7.76.2109100828320.2614@fvyyl> |
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 | 5.9 |
Attack vector | Network |
Attack complexity | High |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | High |
Availability impact | None |
Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22947
- https://curl.se/docs/CVE-2021-22947.html
- https://ubuntu.com/security/notices/USN-5079-1
- https://ubuntu.com/security/notices/USN-5079-2
- https://ubuntu.com/security/notices/USN-5079-3
- https://ubuntu.com/security/notices/USN-5079-4
- https://launchpad.net/bugs/1944120 (regression bug)
- NVD
- Launchpad
- Debian