CVE-2020-15166: Denial of Service in ZeroMQ
First published: Fri Sep 11 2020(Updated: )
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.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ZeroMQ libzmq | <4.3.3 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Debian Debian Linux | =9.0 | |
| debian/zeromq3 | 4.3.4-1+deb11u1 4.3.4-6 4.3.5-1 |
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Reference Links
- 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@lists.fedoraproject.org/message/BZ5IMNQXDB52JFBXHFLK4AHVORFELNNG/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YFW2ZELCCPS4VLU4OSJOH5YL6KFKTFYW/
- https://security.gentoo.org/glsa/202009-12
- https://launchpad.net/bugs/cve/CVE-2020-15166
- 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/
- https://www.openwall.com/lists/oss-security/2020/09/07/3
- https://github.com/zeromq/libzmq/commit/e7f0090b161ce6344f6bd35009816a925c070b09
- https://security-tracker.debian.org/tracker/CVE-2020-15166
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15166
- https://nvd.nist.gov/vuln/detail/CVE-2020-15166
- https://ubuntu.com/security/CVE-2020-15166
Frequently Asked Questions
What is the vulnerability ID of this ZeroMQ vulnerability?
The vulnerability ID of this ZeroMQ vulnerability is CVE-2020-15166.
What is the severity of CVE-2020-15166?
The severity of CVE-2020-15166 is high with a CVSS score of 7.5.
Which software versions are affected by CVE-2020-15166?
The affected software versions include ZeroMQ 4.3.1-4+deb10u2, 4.3.4-1, 4.3.4-6, 4.3.5-1, 4.2.5-1ubuntu0.2+, 4.3.2-2ubuntu1.20.04.1~, 4.1.4-7ubuntu0.1+, 4.3.3-1, and 4.0.4+dfsg-2ubuntu0.1+.
How does this vulnerability impact users?
This vulnerability impacts users with TCP transport public endpoints, even with CURVE/ZAP enabled, by causing a denial-of-service.
Where can I find additional information about CVE-2020-15166?
Additional information about CVE-2020-15166 can be found at the following references: [link1](https://github.com/zeromq/libzmq/security/advisories/GHSA-25wp-cf8g-938m), [link2](https://github.com/zeromq/libzmq/pull/3913), [link3](https://github.com/zeromq/libzmq/pull/3973).
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