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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`.
Publish Date : 2021-10-12 Last Update Date : 2022-10-12
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CVSS Scores & Vulnerability Types
CVSS Score |
3.6 |
Confidentiality Impact |
Partial
(There is considerable informational disclosure.) |
Integrity Impact |
Partial
(Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.) |
Availability Impact |
None
(There is no impact to the availability of the system.) |
Access Complexity |
High
(Specialized access conditions exist. It is hard to exploit and several special conditions must be satisfied to exploit) |
Authentication |
??? |
Gained Access |
None |
Vulnerability Type(s) |
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CWE ID |
444 |
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Products Affected By CVE-2021-41136
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Number Of Affected Versions By Product
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References For CVE-2021-41136
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Metasploit Modules Related To CVE-2021-41136
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