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OCPBUGS-21637: fix: disable HTTP2 connections by default #252

Merged
merged 1 commit into from
Nov 3, 2023
Merged

OCPBUGS-21637: fix: disable HTTP2 connections by default #252

merged 1 commit into from
Nov 3, 2023

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slashpai
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@slashpai slashpai commented Nov 3, 2023

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:

Signed-off-by: Simon Pasquier spasquie@redhat.com
(cherry picked from commit a62e814)

Description

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request.
If it fixes a bug or resolves a feature request, be sure to link to that issue.

Type of change

What type of changes does your code introduce to the Prometheus operator? Put an x in the box that apply.

  • CHANGE (fix or feature that would cause existing functionality to not work as expected)
  • FEATURE (non-breaking change which adds functionality)
  • BUGFIX (non-breaking change which fixes an issue)
  • ENHANCEMENT (non-breaking change which improves existing functionality)
  • NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

Changelog entry

Please put a one-line changelog entry below. This will be copied to the changelog file during the release process.

@simonpasquier @slashpai
fix: disable HTTP2 connections by default
9beb926 
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)
@openshift-ci-robot openshift-ci-robot added jira/valid-reference Indicates that this PR references a valid Jira ticket of any type. jira/valid-bug Indicates that a referenced Jira bug is valid for the branch this PR is targeting. labels Nov 3, 2023
@openshift-ci-robot
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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
  • bug is open, matching expected state (open)
  • bug target version (4.15.0) matches configured target version for branch (4.15.0)
  • bug is in the state ASSIGNED, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact:
/cc @juzhao

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

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:

Signed-off-by: Simon Pasquier spasquie@redhat.com
(cherry picked from commit a62e814)

Description

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request.
If it fixes a bug or resolves a feature request, be sure to link to that issue.

Type of change

What type of changes does your code introduce to the Prometheus operator? Put an x in the box that apply.

  • CHANGE (fix or feature that would cause existing functionality to not work as expected)
  • FEATURE (non-breaking change which adds functionality)
  • BUGFIX (non-breaking change which fixes an issue)
  • ENHANCEMENT (non-breaking change which improves existing functionality)
  • NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

Changelog entry

Please put a one-line changelog entry below. This will be copied to the changelog file during the release process.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

@openshift-ci openshift-ci bot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Nov 3, 2023
simonpasquier
simonpasquier reviewed Nov 3, 2023
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/lgtm

@openshift-ci openshift-ci bot added the lgtm Indicates that a PR is ready to be merged. label Nov 3, 2023
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openshift-ci bot commented Nov 3, 2023

[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

Needs approval from an approver in each of these files:
  • OWNERS [simonpasquier,slashpai]

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openshift-ci bot commented Nov 3, 2023

@slashpai: all tests passed!

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

@openshift-ci openshift-ci bot merged commit d825964 into openshift:master Nov 3, 2023
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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:

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:

Signed-off-by: Simon Pasquier spasquie@redhat.com
(cherry picked from commit a62e814)

Description

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request.
If it fixes a bug or resolves a feature request, be sure to link to that issue.

Type of change

What type of changes does your code introduce to the Prometheus operator? Put an x in the box that apply.

  • CHANGE (fix or feature that would cause existing functionality to not work as expected)
  • FEATURE (non-breaking change which adds functionality)
  • BUGFIX (non-breaking change which fixes an issue)
  • ENHANCEMENT (non-breaking change which improves existing functionality)
  • NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

Changelog entry

Please put a one-line changelog entry below. This will be copied to the changelog file during the release process.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

@openshift-merge-robot
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Fix included in accepted release 4.15.0-0.nightly-2023-11-03-134638

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