CVE-2021-20235
Published: 1 April 2021
There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain the same as it is a static buffer. A remote, unauthenticated attacker who sends a crafted request to the zeromq server could trigger a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is not enabled. The greatest impact of this flaw is to application availability, data integrity, and confidentiality.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
zeromq3 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.2.5-1ubuntu0.2+esm2)
Available with Ubuntu Pro |
| focal |
Released
(4.3.2-2ubuntu1.20.04.1~esm2)
Available with Ubuntu Pro |
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Not vulnerable
(4.3.4-1)
|
|
| impish |
Not vulnerable
(4.3.4-1)
|
|
| jammy |
Not vulnerable
(4.3.4-1)
|
|
| kinetic |
Not vulnerable
(4.3.4-1)
|
|
| lunar |
Not vulnerable
(4.3.4-1)
|
|
| mantic |
Not vulnerable
(4.3.4-1)
|
|
| trusty |
Not vulnerable
(4.0.4+dfsg-2ubuntu0.1+esm2)
|
|
| upstream |
Released
(4.3.3-1)
|
|
| xenial |
Not vulnerable
(code not present)
|
|
|
Patches: upstream: https://github.com/zeromq/libzmq/pull/3902 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.1 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |