RUSTSEC-2021-0081

Potential request smuggling capabilities due to lack of input validation

Issued
Package
actix-http (crates.io)
Type
Vulnerability
Aliases
Patched
  • ^2.2.1
  • >=3.0.0-beta.9
Keywords
  • smuggling
  • http
  • reverse proxy
  • request smuggling

Description

Affected versions of this crate did not properly detect invalid requests that could allow HTTP/1 request smuggling (HRS) attacks when running alongside a vulnerable front-end proxy server. This can result in leaked internal and/or user data, including credentials, when the front-end proxy is also vulnerable.

Popular front-end proxies and load balancers already mitigate HRS attacks so it is recommended that they are also kept up to date; check your specific set up. You should upgrade even if the front-end proxy receives exclusively HTTP/2 traffic and connects to the back-end using HTTP/1; several downgrade attacks are known that can also expose HRS vulnerabilities.

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