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SCA: security update for urllib3 (GHSA-34jh-p97f-mpxf)
medium Tenable Cloud Security Plugin ID 409277
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- 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. (CVE-2024-37891)
See Also
Plugin Details
Severity: Medium
ID: 409277
Version: Revision 1.11
Type: Local
Family: SCA Checks
Published: 1/23/2025
Updated: 7/2/2026
Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Medium
Score: 5
Percentile: 94.39
Vendor
Vendor Severity: Medium
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5.3
Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:N/A:N
CVSS Score Source: CVE-2024-37891
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.9
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 6/17/2024
Vulnerability Publication Date: 6/17/2024
Reference Information
CVE: CVE-2024-37891
IAVA: 2024-A-0363
cwe: CWE-669