OSV-2020-910 Use-of-uninitialized-value in zmq::stream_engine_base_t::out_event
An attacker can cause a denial of service in ZeroMQ by triggering a use-of-uninitialized-value crash in the stream engine.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2020-910?
OSV-2020-910 is an use after free vulnerability in libzmq, published on 21 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24200
Crash type: Use-of-uninitialized-value
Crash state:
zmq::stream_engine_base_t::out_event
zmq::epoll_t::loop
zmq::worker_poller_base_t::worker_routine
Which versions are affected by OSV-2020-910?
1 open source package ship an affected version, including libzmq.
| Package | Affected | Fixed in |
|---|---|---|
libzmq OSS-Fuzz | All versions | None |
How do I fix OSV-2020-910?
No fix has been published for OSV-2020-910 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is OSV-2020-910 being exploited?
There is no known exploitation of OSV-2020-910 in the wild and no public exploit code.