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CVE-2024-37891

CVE-2024-37891 · Proxy-Authorization request header isn't stripped during cross-origin redirects in urllib3

This page contains facts from public vulnerability sources. Check the original advisory before updating.

urllib3 is a user-friendly HTTP client library for Python. When using urllib3's proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected. However, when sending HTTP requests *without* using urllib3's proxy support, it's possible to accidentally configure the `Proxy-Authorization` header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the `Proxy-Authorization` HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects. Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the `Proxy-Authorization` header during cross-origin redirects to avoid the small chance that users are doing this on accident. Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the `Proxy-Authorization` header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach. We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited: 1. Setting the `Proxy-Authorization` header without using urllib3's built-in proxy support. 2. Not disabling HTTP redirects. 3. Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin. Users are advised to update to either version 1.26.19 or version 2.2.2. Users unable to upgrade may use the `Proxy-Authorization` header with urllib3's `ProxyManager`, disable HTTP redirects using `redirects=False` when sending requests, or not user the `Proxy-Authorization` header as mitigations.

CVSS 4.4 · Medium · EPSS 1.1% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • urllib3

    Versions
    • < 1.26.19: Affected
    • >= 2.0.0, < 2.2.2: Affected

    No fix published

  • python-urllib3 Debian:12

    Versions
    • 1.26.12-1
    Affected ranges
    • ECOSYSTEM: < 1.26.12-1+deb12u1

    Update to 1.26.12-1+deb12u1

  • python-urllib3 Debian:13

    Affected ranges
    • ECOSYSTEM: < 2.2.3-3

    Update to 2.2.3-3

  • python-urllib3 Debian:14

    Affected ranges
    • ECOSYSTEM: < 2.2.3-3

    Update to 2.2.3-3

  • urllib3 PyPI

    Versions
    • 0.2
    • 0.3
    • 0.3.1
    • 0.4.0
    • 0.4.1
    • 1.0
    • 1.0.1
    • 1.0.2
    • 1.1
    • 1.10
    • 1.10.1
    • 1.10.2
    • 1.10.3
    • 1.10.4
    • 1.11
    • 1.12
    • 1.13
    • 1.13.1
    • 1.14
    • 1.15
    • 1.15.1
    • 1.16
    • 1.17
    • 1.18
    • 1.18.1
    • 1.19
    • 1.19.1
    • 1.2
    • 1.2.1
    • 1.2.2
    • 1.20
    • 1.21
    • 1.21.1
    • 1.22
    • 1.23
    • 1.24
    • 1.24.1
    • 1.24.2
    • 1.24.3
    • 1.25
    • 1.25.1
    • 1.25.10
    • 1.25.11
    • 1.25.2
    • 1.25.3
    • 1.25.4
    • 1.25.5
    • 1.25.6
    • 1.25.7
    • 1.25.8
    • 1.25.9
    • 1.26.0
    • 1.26.1
    • 1.26.10
    • 1.26.11
    • 1.26.12
    • 1.26.13
    • 1.26.14
    • 1.26.15
    • 1.26.16
    • 1.26.17
    • 1.26.18
    • 1.26.2
    • 1.26.3
    • 1.26.4
    • 1.26.5
    • 1.26.6
    • 1.26.7
    • 1.26.8
    • 1.26.9
    • 1.3
    • 1.4
    • 1.5
    • 1.6
    • 1.7
    • 1.7.1
    • 1.8
    • 1.8.2
    • 1.8.3
    • 1.9
    • 1.9.1
    Affected ranges
    • ECOSYSTEM: < 1.26.19

    Update to 1.26.19

  • urllib3 PyPI

    Versions
    • 2.0.0
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.1.0
    • 2.2.0
    • 2.2.1
    Affected ranges
    • ECOSYSTEM: ≥ 2.0.0, < 2.2.2

    Update to 2.2.2

  • urllib3 PyPI

    Versions
    • 0.2
    • 0.3
    • 0.3.1
    • 0.4.0
    • 0.4.1
    • 1.0
    • 1.0.1
    • 1.0.2
    • 1.1
    • 1.10
    • 1.10.1
    • 1.10.2
    • 1.10.3
    • 1.10.4
    • 1.11
    • 1.12
    • 1.13
    • 1.13.1
    • 1.14
    • 1.15
    • 1.15.1
    • 1.16
    • 1.17
    • 1.18
    • 1.18.1
    • 1.19
    • 1.19.1
    • 1.2
    • 1.2.1
    • 1.2.2
    • 1.20
    • 1.21
    • 1.21.1
    • 1.22
    • 1.23
    • 1.24
    • 1.24.1
    • 1.24.2
    • 1.24.3
    • 1.25
    • 1.25.1
    • 1.25.10
    • 1.25.11
    • 1.25.2
    • 1.25.3
    • 1.25.4
    • 1.25.5
    • 1.25.6
    • 1.25.7
    • 1.25.8
    • 1.25.9
    • 1.26.0
    • 1.26.1
    • 1.26.10
    • 1.26.11
    • 1.26.12
    • 1.26.13
    • 1.26.14
    • 1.26.15
    • 1.26.16
    • 1.26.17
    • 1.26.18
    • 1.26.2
    • 1.26.3
    • 1.26.4
    • 1.26.5
    • 1.26.6
    • 1.26.7
    • 1.26.8
    • 1.26.9
    • 1.3
    • 1.4
    • 1.5
    • 1.6
    • 1.7
    • 1.7.1
    • 1.8
    • 1.8.2
    • 1.8.3
    • 1.9
    • 1.9.1
    • 2.0.0
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.1.0
    • 2.2.0
    • 2.2.1
    Affected ranges
    • ECOSYSTEM: < 1.26.19 ∪ ≥ 2.0.0, < 2.2.2

    Update to 1.26.19; Update to 2.2.2

  • python-pip Ubuntu:Pro:14.04:LTS

    Versions
    • 1.4.1-2
    • 1.5.4-1
    • 1.5.4-1ubuntu1
    • 1.5.4-1ubuntu3
    • 1.5.4-1ubuntu4
    • 1.5.4-1ubuntu4+esm1
    • 1.5.4-1ubuntu4+esm2
    • 1.5.4-1ubuntu4+esm3
    • 1.5.4-1ubuntu4+esm4
    • 1.5.4-1ubuntu4+esm5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:Pro:16.04:LTS

    Versions
    • 1.11-1
    • 1.12-1
    • 1.13.1-1
    • 1.13.1-2
    • 1.13.1-2ubuntu0.16.04.1
    • 1.13.1-2ubuntu0.16.04.2
    • 1.13.1-2ubuntu0.16.04.3
    • 1.13.1-2ubuntu0.16.04.4
    • 1.13.1-2ubuntu0.16.04.4+esm1
    Affected ranges
    • ECOSYSTEM: < 1.13.1-2ubuntu0.16.04.4+esm2

    Update to 1.13.1-2ubuntu0.16.04.4+esm2

  • python-pip Ubuntu:Pro:16.04:LTS

    Versions
    • 1.5.6-7ubuntu1
    • 1.5.6-7ubuntu2
    • 8.0.2-7
    • 8.0.3-1
    • 8.0.3-2
    • 8.1.0-1
    • 8.1.0-2
    • 8.1.1-1
    • 8.1.1-2
    • 8.1.1-2ubuntu0.1
    • 8.1.1-2ubuntu0.2
    • 8.1.1-2ubuntu0.4
    • 8.1.1-2ubuntu0.6
    • 8.1.1-2ubuntu0.6+esm2
    • 8.1.1-2ubuntu0.6+esm3
    • 8.1.1-2ubuntu0.6+esm4
    • 8.1.1-2ubuntu0.6+esm5
    • 8.1.1-2ubuntu0.6+esm6
    • 8.1.1-2ubuntu0.6+esm8
    Affected ranges
    • ECOSYSTEM: < 8.1.1-2ubuntu0.6+esm10

    Update to 8.1.1-2ubuntu0.6+esm10

  • python-urllib3 Ubuntu:Pro:18.04:LTS

    Versions
    • 1.21.1-1
    • 1.22-1
    • 1.22-1ubuntu0.18.04.1
    • 1.22-1ubuntu0.18.04.2
    • 1.22-1ubuntu0.18.04.2+esm1
    Affected ranges
    • ECOSYSTEM: < 1.22-1ubuntu0.18.04.2+esm2

    Update to 1.22-1ubuntu0.18.04.2+esm2

  • python-pip Ubuntu:Pro:18.04:LTS

    Versions
    • 9.0.1-2
    • 9.0.1-2.3~ubuntu1
    • 9.0.1-2.3~ubuntu1.18.04.1
    • 9.0.1-2.3~ubuntu1.18.04.2
    • 9.0.1-2.3~ubuntu1.18.04.3
    • 9.0.1-2.3~ubuntu1.18.04.4
    • 9.0.1-2.3~ubuntu1.18.04.5
    • 9.0.1-2.3~ubuntu1.18.04.5+esm2
    • 9.0.1-2.3~ubuntu1.18.04.5+esm3
    • 9.0.1-2.3~ubuntu1.18.04.6
    • 9.0.1-2.3~ubuntu1.18.04.6+esm1
    • 9.0.1-2.3~ubuntu1.18.04.7
    • 9.0.1-2.3~ubuntu1.18.04.7+esm1
    • 9.0.1-2.3~ubuntu1.18.04.8
    • 9.0.1-2.3~ubuntu1.18.04.8+esm1
    • 9.0.1-2.3~ubuntu1.18.04.8+esm2
    • 9.0.1-2.3~ubuntu1.18.04.8+esm4
    Affected ranges
    • ECOSYSTEM: < 9.0.1-2.3~ubuntu1.18.04.8+esm6

    Update to 9.0.1-2.3~ubuntu1.18.04.8+esm6

  • python-pip Ubuntu:20.04:LTS

    Versions
    • 18.1-5
    • 18.1-5build1
    • 18.1-5ubuntu1
    • 20.0.2-2
    • 20.0.2-4
    • 20.0.2-5
    • 20.0.2-5ubuntu1
    • 20.0.2-5ubuntu1.1
    • 20.0.2-5ubuntu1.3
    • 20.0.2-5ubuntu1.4
    • 20.0.2-5ubuntu1.5
    • 20.0.2-5ubuntu1.6
    • 20.0.2-5ubuntu1.7
    • 20.0.2-5ubuntu1.8
    • 20.0.2-5ubuntu1.9
    • 20.0.2-5ubuntu1.10
    Affected ranges
    • ECOSYSTEM: < 20.0.2-5ubuntu1.11

    Update to 20.0.2-5ubuntu1.11

  • python-urllib3 Ubuntu:20.04:LTS

    Versions
    • 1.24.1-1ubuntu1
    • 1.24.1-1ubuntu2
    • 1.25.8-1
    • 1.25.8-2
    • 1.25.8-2ubuntu0.1
    • 1.25.8-2ubuntu0.2
    • 1.25.8-2ubuntu0.3
    Affected ranges
    • ECOSYSTEM: < 1.25.8-2ubuntu0.4

    Update to 1.25.8-2ubuntu0.4

  • python-pip Ubuntu:22.04:LTS

    Versions
    • 20.3.4-4
    • 21.3.1+dfsg-3
    • 22.0.2+dfsg-1
    • 22.0.2+dfsg-1ubuntu0.1
    • 22.0.2+dfsg-1ubuntu0.2
    • 22.0.2+dfsg-1ubuntu0.3
    • 22.0.2+dfsg-1ubuntu0.4
    Affected ranges
    • ECOSYSTEM: < 22.0.2+dfsg-1ubuntu0.5

    Update to 22.0.2+dfsg-1ubuntu0.5

  • python-urllib3 Ubuntu:22.04:LTS

    Versions
    • 1.26.5-1~exp1
    • 1.26.5-1~exp1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 1.26.5-1~exp1ubuntu0.2

    Update to 1.26.5-1~exp1ubuntu0.2

  • python-pip Ubuntu:24.04:LTS

    Versions
    • 23.2+dfsg-1
    • 23.3+dfsg-1
    • 24.0+dfsg-1
    • 24.0+dfsg-1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 24.0+dfsg-1ubuntu1.1

    Update to 24.0+dfsg-1ubuntu1.1

  • python-urllib3 Ubuntu:24.04:LTS

    Versions
    • 1.26.16-1
    • 1.26.18-1
    • 2.0.7-1
    Affected ranges
    • ECOSYSTEM: < 2.0.7-1ubuntu0.1

    Update to 2.0.7-1ubuntu0.1

Original sources

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