CVE-2020-15166

11.09.2020, 16:15

In ZeroMQ before version 4.3.3, there is a denial-of-service vulnerability. Users with TCP transport public endpoints, even with CURVE/ZAP enabled, are impacted. If a raw TCP socket is opened and connected to an endpoint that is fully configured with CURVE/ZAP, legitimate clients will not be able to exchange any message. Handshakes complete successfully, and messages are delivered to the library, but the server application never receives them. This is patched in version 4.3.3.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub_M	CNA	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 75%

Vendor	Product	Version
zeromq	libzmq	𝑥 < 4.3.3
debian	debian_linux	9.0

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

zeromq3

bullseye	4.3.4-1+deb11u1 fixed
bookworm	4.3.4-6 fixed
sid	4.3.5-1 fixed
trixie	4.3.5-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

zeromq3

noble	not-affected
mantic	not-affected
lunar	not-affected
kinetic	not-affected
jammy	not-affected
impish	not-affected
hirsute	not-affected
groovy	ignored
focal	Fixed 4.3.2-2ubuntu1.20.04.1~esm1 released
bionic	Fixed 4.2.5-1ubuntu0.2+esm1 released
xenial	Fixed 4.1.4-7ubuntu0.1+esm1 released
trusty	Fixed 4.0.4+dfsg-2ubuntu0.1+esm2 released

Common Weakness Enumeration

CWE-400 - Uncontrolled Resource Consumption
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

References

https://github.com/zeromq/libzmq/pull/3913

https://github.com/zeromq/libzmq/pull/3973

https://github.com/zeromq/libzmq/security/advisories/GHSA-25wp-cf8g-938m

https://lists.debian.org/debian-lts-announce/2020/11/msg00017.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZ5IMNQXDB52JFBXHFLK4AHVORFELNNG/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YFW2ZELCCPS4VLU4OSJOH5YL6KFKTFYW/