CVE-2020-11077 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html https://github.com/puma/puma/blob/master/History.md434435-and-31253126–2020-05-22 https://github.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxm https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5