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Moderate severityNVD Advisory· Published May 22, 2020· Updated Aug 4, 2024

HTTP Smuggling via Transfer-Encoding Header in Puma

CVE-2020-11077

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
pumaRubyGems
< 3.12.63.12.6
pumaRubyGems
>= 4.0.0, < 4.3.54.3.5

Affected products

219

Patches

Vulnerability mechanics

References

10

News mentions

0

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