PT-2020-6974 · Zeromq+4 · Zeromq+4

Pedro Sampaio · Published 2020-05-19 · Updated 2022-08-05 · CVE-2021-20237

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions ZeroMQ versions prior to 4.3.3

Description An uncontrolled resource consumption flaw, also known as a memory leak, was found in ZeroMQ's src/xpub.cpp. This issue allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this issue is to system availability.

Recommendations For versions prior to 4.3.3, update to version 4.3.3 or later to resolve the issue. As a temporary workaround, consider disabling the CURVE/ZAP authentication or restricting access to the server to minimize the risk of exploitation.

Fix

DoS

Resource Exhaustion

Memory Leak

Weakness Enumeration

CWE-400

CWE-401

Related Identifiers

ALT-PU-2022-1314

BDU:2024-06962

CVE-2021-20237

GHSA-4P5V-H92W-6WXW

USN-4920-1

Affected Products

Alt Linux

Astra Linux

Linuxmint

Ubuntu

Zeromq

References · 20

• https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxw · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-20237 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-20237 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-20235 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-20237 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4920-1 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2024-0830SE17 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-20237 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-13132 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-06962 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-20237 · Security Note
• https://ubuntu.com/security/CVE-2020-15166 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2024-1031SE47 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-20234 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-20237 · Vendor Advisory