id: GO-2024-2963
modules:
    - module: std
      versions:
        - fixed: 1.21.12
        - introduced: 1.22.0-0
        - fixed: 1.22.5
      vulnerable_at: 1.22.4
      packages:
        - package: net/http
          symbols:
            - persistConn.readResponse
          derived_symbols:
            - Client.CloseIdleConnections
            - Client.Do
            - Client.Get
            - Client.Head
            - Client.Post
            - Client.PostForm
            - Get
            - Head
            - Post
            - PostForm
            - Transport.CancelRequest
            - Transport.CloseIdleConnections
            - Transport.RoundTrip
summary: Denial of service due to improper 100-continue handling in net/http
description: |-
    The net/http HTTP/1.1 client mishandled the case where a server responds to a
    request with an "Expect: 100-continue" header with a non-informational (200 or
    higher) status. This mishandling could leave a client connection in an invalid
    state, where the next request sent on the connection will fail.

    An attacker sending a request to a net/http/httputil.ReverseProxy proxy can
    exploit this mishandling to cause a denial of service by sending "Expect:
    100-continue" requests which elicit a non-informational response from the
    backend. Each such request leaves the proxy with an invalid connection, and
    causes one subsequent request using that connection to fail.
credits:
    - Geoff Franks
references:
    - fix: https://go.dev/cl/591255
    - report: https://go.dev/issue/67555
    - web: https://groups.google.com/g/golang-dev/c/t0rK-qHBqzY/m/6MMoAZkMAgAJ
cve_metadata:
    id: CVE-2024-24791
    cwe: 'CWE 400: Uncontrolled Resource Consumption'
source:
    id: go-security-team
    created: 2024-07-02T15:43:26.900923-04:00
review_status: REVIEWED