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[Security] Bump urllib3 from 1.26.17 to 1.26.18

HIFIS Bot requested to merge dependabot/pip/urllib3-1.26.18 into master

Bumps urllib3 from 1.26.17 to 1.26.18. This update includes a security fix.

Vulnerabilities fixed

urllib3's request body not stripped after redirect from 303 status changes request method to GET urllib3 previously wouldn't remove the HTTP request body when an HTTP redirect response using status 303 "See Other" after the request had its method changed from one that could accept a request body (like POST) to GET as is required by HTTP RFCs. Although the behavior of removing the request body is not specified in the section for redirects, it can be inferred by piecing together information from different sections and we have observed the behavior in other major HTTP client implementations like curl and web browsers.

From RFC 9110 Section 9.3.1:

A client SHOULD NOT generate content in a GET request unless it is made directly to an origin server that has previously indicated, in or out of band, that such a request has a purpose and will be adequately supported.

Affected usages

Because the vulnerability requires a previously trusted service to become compromised in order to have an impact on confidentiality we believe the exploitability of this vulnerability is low. Additionally, many users aren't putting sensitive data in HTTP request bodies, if this is the case then this vulnerability isn't exploitable.

Both of the following conditions must be true to be affected by this vulnerability:

  • If you're using urllib3 and submitting sensitive information in the HTTP request body (such as form data or JSON)
  • The origin service is compromised and starts redirecting using 303 to a malicious peer or the redirected-to service becomes compromised.

Remediation

You can remediate this vulnerability with any of the following steps:

  • Upgrade to a patched version of urllib3 (v1.26.18 or v2.0.7)

... (truncated)

Patched versions: 1.26.18 Affected versions: <= 1.26.17

Release notes

Sourced from urllib3's releases.

1.26.18

  • Made body stripped from HTTP requests changing the request method to GET after HTTP 303 "See Other" redirect responses. (GHSA-g4mx-q9vg-27p4)
Changelog

Sourced from urllib3's changelog.

1.26.18 (2023-10-17)

  • Made body stripped from HTTP requests changing the request method to GET after HTTP 303 "See Other" redirect responses.
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