OCPBUGS-21637: fix: disable HTTP2 connections by default #252
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This change mitigates CVE-2023-44487 by disabling HTTP2 by default and forcing HTTP/1.1 until the Go standard library and golang.org/x/net are fully fixed. Right now, it is possible for authenticated and unauthenticated users to hold open HTTP2 connections and consume huge amounts of memory. It is possible to revert back the change by using the `--web.enable-http2` argument. Before this change: ``` curl -kv https://localhost:8443/metrics * Trying 127.0.0.1:8443... * Connected to localhost (127.0.0.1) port 8443 (#0) * ALPN: offers h2,http/1.1 [...] * ALPN: server accepted h2 [...] * using HTTP/2 * h2h3 [:method: GET] * h2h3 [:path: /metrics] * h2h3 [:scheme: https] * h2h3 [:authority: localhost:8443] * h2h3 [user-agent: curl/8.0.1] * h2h3 [accept: */*] * Using Stream ID: 1 (easy handle 0x5594d4614b10) [...] > GET /metrics HTTP/2 [...] ``` After this change: ``` curl -kv https://localhost:8443/metrics * Trying 127.0.0.1:8443... * Connected to localhost (127.0.0.1) port 8443 (#0) * ALPN: offers h2,http/1.1 [...] * ALPN: server accepted http/1.1 [...] * using HTTP/1.1 > GET /metrics HTTP/1.1 > Host: localhost:8443 > User-Agent: curl/8.0.1 > Accept: */* [...] < HTTP/1.1 200 OK [...] ``` See also: * kubernetes/kubernetes#121120 * kubernetes/kubernetes#121197 * golang/go#63417 (comment) Signed-off-by: Simon Pasquier <spasquie@redhat.com> (cherry picked from commit a62e814)
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@slashpai: This pull request references Jira Issue OCPBUGS-21637, which is valid. The bug has been moved to the POST state. 3 validation(s) were run on this bug
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: simonpasquier, slashpai The full list of commands accepted by this bot can be found here. The pull request process is described here
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@slashpai: Jira Issue OCPBUGS-21637: All pull requests linked via external trackers have merged: Jira Issue OCPBUGS-21637 has been moved to the MODIFIED state. In response to this:
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Fix included in accepted release 4.15.0-0.nightly-2023-11-03-134638 |
This change mitigates CVE-2023-44487 by disabling HTTP2 by default and forcing HTTP/1.1 until the Go standard library and golang.org/x/net are fully fixed. Right now, it is possible for authenticated and unauthenticated users to hold open HTTP2 connections and consume huge amounts of memory.
It is possible to revert back the change by using the
--web.enable-http2argument.Before this change:
After this change:
See also:
Signed-off-by: Simon Pasquier spasquie@redhat.com
(cherry picked from commit a62e814)
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