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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.
Vulnerable Library - urllib3-1.26.18-py2.py3-none-any.whl
HTTP library with thread-safe connection pooling, file post, and more.
Library home page: https://files.pythonhosted.org/packages/b0/53/aa91e163dcfd1e5b82d8a890ecf13314e3e149c05270cc644581f77f17fd/urllib3-1.26.18-py2.py3-none-any.whl
Path to dependency file: /test-requirements.txt
Path to vulnerable library: /test-requirements.txt,/requirements.txt,/tmp/ws-scm/astroscaler
Vulnerabilities
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
CVE-2024-37891
Vulnerable Library - urllib3-1.26.18-py2.py3-none-any.whl
HTTP library with thread-safe connection pooling, file post, and more.
Library home page: https://files.pythonhosted.org/packages/b0/53/aa91e163dcfd1e5b82d8a890ecf13314e3e149c05270cc644581f77f17fd/urllib3-1.26.18-py2.py3-none-any.whl
Path to dependency file: /test-requirements.txt
Path to vulnerable library: /test-requirements.txt,/requirements.txt,/tmp/ws-scm/astroscaler
Dependency Hierarchy:
Found in base branch: main
Vulnerability Details
urllib3 is a user-friendly HTTP client library for Python. When using urllib3's proxy support with
ProxyManager
, theProxy-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 theProxy-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 theProxy-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 theProxy-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 theProxy-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 theProxy-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 theProxy-Authorization
header with urllib3'sProxyManager
, disable HTTP redirects usingredirects=False
when sending requests, or not user theProxy-Authorization
header as mitigations.Publish Date: 2024-06-17
URL: CVE-2024-37891
CVSS 3 Score Details (4.4)
Base Score Metrics:
Suggested Fix
Type: Upgrade version
Origin: GHSA-34jh-p97f-mpxf
Release Date: 2024-06-17
Fix Resolution: 1.26.19
⛑️ Automatic Remediation will be attempted for this issue.
⛑️Automatic Remediation will be attempted for this issue.
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