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.
References
Link Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1921983 Issue Tracking Patch Third Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6 Patch Third Party Advisory
History

No history.

cve-icon MITRE Information

Status: PUBLISHED

Assigner: redhat

Published: 2021-04-01T13:47:05

Updated: 2021-04-01T13:47:05

Reserved: 2020-12-17T00:00:00


Link: CVE-2021-20235

JSON object: View

cve-icon NVD Information

Status : Modified

Published: 2021-04-01T14:15:13.217

Modified: 2023-11-07T03:29:01.440


Link: CVE-2021-20235

JSON object: View

cve-icon Redhat Information

No data.