GHSA-c2jg-hw38-jrqq

Suggest an improvement
Source
https://github.com/advisories/GHSA-c2jg-hw38-jrqq
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/04/GHSA-c2jg-hw38-jrqq/GHSA-c2jg-hw38-jrqq.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-c2jg-hw38-jrqq
Aliases
Published
2022-04-04T21:29:41Z
Modified
2024-11-25T19:05:34.591452Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 9.2 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Inconsistent Interpretation of HTTP Requests in twisted.web
Details

The Twisted Web HTTP 1.1 server, located in the twisted.web.http module, parsed several HTTP request constructs more leniently than permitted by RFC 7230:

  1. The Content-Length header value could have a + or - prefix.
  2. Illegal characters were permitted in chunked extensions, such as the LF (\n) character.
  3. Chunk lengths, which are expressed in hexadecimal format, could have a prefix of 0x.
  4. HTTP headers were stripped of all leading and trailing ASCII whitespace, rather than only space and HTAB (\t).

This non-conformant parsing can lead to desync if requests pass through multiple HTTP parsers, potentially resulting in HTTP request smuggling.

Impact

You may be affected if:

  1. You use Twisted Web's HTTP 1.1 server and/or proxy
  2. You also pass requests through a different HTTP server and/or proxy

The specifics of the other HTTP parser matter. The original report notes that some versions of Apache Traffic Server and HAProxy have been vulnerable in the past. HTTP request smuggling may be a serious concern if you use a proxy to perform request validation or access control.

The Twisted Web client is not affected. The HTTP 2.0 server uses a different parser, so it is not affected.

Patches

The issue has been addressed in Twisted 22.4.0rc1 and later.

Workarounds

Other than upgrading Twisted, you could:

  • Ensure any vulnerabilities in upstream proxies have been addressed, such as by upgrading them
  • Filter malformed requests by other means, such as configuration of an upstream proxy

Credits

This issue was initially reported by Zhang Zeyu.

Database specific 
{
    "nvd_published_at": "2022-04-04T18:15:00Z",
    "cwe_ids": [
        "CWE-444"
    ],
    "severity": "CRITICAL",
    "github_reviewed": true,
    "github_reviewed_at": "2022-04-04T21:29:41Z"
}
References

Affected packages

PyPI / twisted

Package

Name
twisted
View open source insights on deps.dev
Purl
pkg:pypi/twisted

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
22.4.0

Affected versions

1.*

1.0.1
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.1.0
1.1.1
1.2.0

2.*

2.1.0
2.4.0
2.5.0

8.*

8.0.0
8.0.1
8.1.0
8.2.0

9.*

9.0.0

10.*

10.0.0
10.1.0
10.2.0

11.*

11.0.0
11.1.0

12.*

12.0.0
12.1.0
12.2.0
12.3.0

13.*

13.0.0
13.1.0
13.2.0

14.*

14.0.0
14.0.1
14.0.2

15.*

15.0.0
15.1.0
15.2.0
15.2.1
15.3.0
15.4.0
15.5.0

16.*

16.0.0
16.1.0
16.1.1
16.2.0
16.3.0
16.3.1
16.3.2
16.4.0
16.4.1
16.5.0rc1
16.5.0rc2
16.5.0
16.6.0rc1
16.6.0
16.7.0rc1
16.7.0rc2

17.*

17.1.0rc1
17.1.0
17.5.0
17.9.0rc1
17.9.0

18.*

18.4.0rc1
18.4.0
18.7.0rc1
18.7.0rc2
18.7.0
18.9.0rc1
18.9.0

19.*

19.2.0rc1
19.2.0rc2
19.2.0
19.2.1
19.7.0rc1
19.7.0
19.10.0rc1
19.10.0

20.*

20.3.0rc1
20.3.0

21.*

21.2.0rc1
21.2.0
21.7.0rc1
21.7.0rc2
21.7.0rc3
21.7.0

22.*

22.1.0rc1
22.1.0
22.2.0rc1
22.2.0
22.4.0rc1