#VU46682 Resource management error in zeromq - CVE-2020-15166

Vulnerability identifier: #VU46682

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-15166

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
zeromq
Other software / Other software solutions

Vendor: ZeroMQ Project

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources with the application when processing TCP requests. 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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

zeromq: 4.0.6 - 4.3.2

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External 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://security.gentoo.org/glsa/202009-12

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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.