Vulnerabilities affecting this package (0)
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This package is not known to be affected by vulnerabilities.
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Vulnerabilities fixed by this package (1)
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VCID-f2nc-ks7a-2yes
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urllib3's Proxy-Authorization request header isn't stripped during cross-origin redirects
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.
## Affected usages
We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:
* Setting the `Proxy-Authorization` header without using urllib3's built-in proxy support.
* Not disabling HTTP redirects.
* Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin.
## Remediation
* Using the `Proxy-Authorization` header with urllib3's `ProxyManager`.
* Disabling HTTP redirects using `redirects=False` when sending requests.
* Not using the `Proxy-Authorization` header.
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CVE-2024-37891
GHSA-34jh-p97f-mpxf
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