libzmq5: There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp
CVE-2021-20235 is fixed in libzmq5 on 1 platform, first by libzmq5 4.2.5-1ubuntu0.2+esm2, released May 28, 2021. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libzmq5 · Ubuntu 18.04.6 LTS (bionic) | 4.2.5-1ubuntu0.2+esm2 | libzmq5 4.2.5-1ubuntu0.2+esm2 | May 28, 2021 |
| libzmq5 · Ubuntu 20.04 LTS (focal) | 4.3.2-2ubuntu1.20.04.1~esm2 | libzmq5 4.3.2-2ubuntu1.20.04.1~esm2 | May 28, 2021 |
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