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CVE-2020-11077

6.8 · MEDIUM

In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client.

Published May 22, 2020CWE-444EPSS 2.88%

Overview

CVE-2020-11077 is a medium-severity vulnerability. It was published on May 22, 2020 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This is a similar but different vulnerability from CVE-2020-11076. The problem has been fixed in Puma 3.12.6 and Puma 4.3.5.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2020-07/msg00034.htmlReflists.opensuse.org/opensuse-security-announce/2020-07/msg00038.htmlGitHubgithub.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22GitHubgithub.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxmReflists.debian.org/debian-lts-announce/2020/10/msg00009.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/Reflists.opensuse.org/opensuse-security-announce/2020-07/msg00034.htmlReflists.opensuse.org/opensuse-security-announce/2020-07/msg00038.htmlGitHubgithub.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22GitHubgithub.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxm

How CyberStrike helps

Frequently asked questions

What is CVE-2020-11077?

CVE-2020-11077 is a medium-severity vulnerability. It was published on May 22, 2020 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2020-11077?

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-11077?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-11077?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-11077 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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