CVE-2020-11077 — HTTP Smuggling via Transfer-Encoding Header in Puma

Affected: puma

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.

USN-6682-1 — puma vulnerabilities

Affected: Ubuntu:Pro:20.04:LTS: puma, Ubuntu:Pro:22.04:LTS: puma

ZeddYu Lu discovered that Puma incorrectly handled parsing certain headers. A remote attacker could possibly use this issue to perform an HTTP Request Smuggling attack. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-11076)

It was discovered that Puma incorrectly handled parsing certain headers. A remote attacker could possibly use this issue to perform an HTTP Request Smuggling attack. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-11077)

Jean Boussier discovered that Puma might not always release resources properly after handling HTTP requests. A remote attacker could possibly use this issue to read sensitive information. (CVE-2022-23634)

It was discovered that Puma incorrectly handled certain malformed headers. A remote attacker could use this issue to perform an HTTP Request Smuggling attack. (CVE-2022-24790)

Ben Kallus discovered that Puma incorrectly handled parsing certain headers. A remote attacker could use this issue to perform an HTTP Request Smuggling attack. (CVE-2023-40175)

Bartek Nowotarski discovered that Puma incorrectly handled parsing certain encoded content. A remote attacker could possibly use this to cause a denial of service. (CVE-2024-21647)

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CVE-2020-11077 — HTTP Smuggling via Transfer-Encoding Header in Puma

USN-6682-1 — puma vulnerabilities