Out-of-bounds write in www.zeromq zeromq

1) Out-of-bounds write

EUVDB-ID: #VU66176

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-20235

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error in src/decoder_allocators.hpp. A remote attacker can send a specially crafted request to the zeromq server and trigger a buffer overflow write of arbitrary data if CURVE/ZAP authentication is not enabled.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

zeromq: 4.2.0 - 4.3.2

CPE2.3

• cpe:2.3:a:zeromq_project:zeromq:4.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:zeromq_project:zeromq:4.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:zeromq_project:zeromq:4.2.2:*:*:*:*:*:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=1921983
https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.