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CVE-2020-15166

Published: 11 September 2020

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.

From the Ubuntu Security Team

It was discovered that ZeroMQ mishandled certain network traffic. An unauthenticated attacker could use this vulnerability to cause a denial-of-service and prevent legitimate clients from communicating with ZeroMQ.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
zeromq3
Launchpad, Ubuntu, Debian
impish Not vulnerable
(4.3.3-4ubuntu1)
hirsute Not vulnerable
(4.3.3-4ubuntu1)
bionic
Released (4.2.5-1ubuntu0.2+esm1)
Available with Ubuntu Pro
focal
Released (4.3.2-2ubuntu1.20.04.1~esm1)
Available with Ubuntu Pro
xenial
Released (4.1.4-7ubuntu0.1+esm1)
Available with Ubuntu Pro
groovy Ignored
(end of life)
upstream
Released (4.3.3-1)
kinetic Not vulnerable
(4.3.3-4ubuntu1)
trusty
Released (4.0.4+dfsg-2ubuntu0.1+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
jammy Not vulnerable
(4.3.3-4ubuntu1)
lunar Not vulnerable
(4.3.3-4ubuntu1)
mantic Not vulnerable
(4.3.3-4ubuntu1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H