CVE-2021-41136

描述

Puma is a HTTP 1.1 server for Ruby/Rack applications. Prior to versions 5.5.1 and 4.3.9, using `puma` with a proxy which forwards HTTP header values which contain the LF character could allow HTTP request smugggling. A client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. The only proxy which has this behavior, as far as the Puma team is aware of, is Apache Traffic Server. 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 vulnerability was patched in Puma 5.5.1 and 4.3.9. As a workaround, do not use Apache Traffic Server with `puma`.

如何修補 CVE-2021-41136

要修補 CVE-2021-41136,請將受影響套件升級到下列已修補版本。

• —升級至 5.5.1 或更新版本

CVE-2021-41136 正在被利用嗎?

低 — EPSS 為 1.1%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 5.0.0, < 5.5.1

CVSS 分數

參考連結(12)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-41136
• PATCHgithub.com/puma/puma
• WEBgithub.com/puma/puma/commit/436c71807f00e07070902a03f79fd3e130eb6b18
• WEBgithub.com/puma/puma/commit/acdc3ae571dfae0e045cf09a295280127db65c7f