CVE-2021-21419
Published: 7 May 2021
Eventlet is a concurrent networking library for Python. A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.
Notes
| Author | Note |
|---|---|
| leosilva | support for permessage-defalte extension or compression extension was added by b7d2a251ad55e1c161aa6c8aa236db456c4c4a21 and it's not present in versions of Bionic and xenial/esm-infra. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
python-eventlet Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
| focal |
Released
(0.25.1-2ubuntu1.1)
|
|
| groovy |
Released
(0.26.1-0ubuntu1.1)
|
|
| hirsute |
Released
(0.30.0-0ubuntu1.1)
|
|
| impish |
Released
(0.30.0-0ubuntu2)
|
|
| jammy |
Released
(0.30.0-0ubuntu2)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(0.31.0)
|
|
| xenial |
Not vulnerable
(code not present)
|
|
|
Patches: upstream: https://github.com/eventlet/eventlet/commit/1412f5e4125b4313f815778a1acb4d3336efcd07 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.3 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |