Detections
Analytics
Linux Distros Unpatched Vulnerability : CVE-2024-37891
medium Nessus Plugin ID 229443
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Synopsis
The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.Description
The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.- 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)
Note that Nessus relies on the presence of the package as reported by the vendor.
Solution
There is no known solution at this time.See Also
Plugin Details
Severity: Medium
ID: 229443
File Name: unpatched_CVE_2024_37891.nasl
Version: 1.4
Type: local
Agent: unix
Family: Misc.
Published: 3/5/2025
Updated: 9/25/2025
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 5.8
Temporal Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N
CVSS Score Source: CVE-2024-37891
CVSS v3
Risk Factor: Medium
Base Score: 4.4
Temporal Score: 3.9
Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:centos:centos:8, p-cpe:/a:canonical:ubuntu_linux:python-pip, p-cpe:/a:canonical:ubuntu_linux:python-urllib3, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:python2-pip-wheel, p-cpe:/a:centos:centos:python2-pip-wheel, p-cpe:/a:centos:centos:python2-pip, p-cpe:/a:redhat:enterprise_linux:python2-pip, cpe:/o:canonical:ubuntu_linux:14.04:-:lts
Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 6/17/2024
Reference Information
CVE: CVE-2024-37891