CVE-2021-20235
Publication date 1 April 2021
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
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.
Status
Package | Ubuntu Release | Status |
---|---|---|
zeromq3 | 24.04 LTS noble |
Not affected
|
22.04 LTS jammy |
Not affected
|
|
20.04 LTS focal |
Fixed 4.3.2-2ubuntu1.20.04.1~esm2
|
|
18.04 LTS bionic |
Fixed 4.2.5-1ubuntu0.2+esm2
|
|
16.04 LTS xenial |
Not affected
|
|
14.04 LTS trusty |
Not affected
|
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Get Ubuntu ProSeverity score breakdown
Parameter | Value |
---|---|
Base score | 8.1 · High |
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 |
References
Related Ubuntu Security Notices (USN)
- USN-4920-1
- ZeroMQ vulnerabilities
- 15 June 2022