This vulnerability allows the `Proxy-Authorization` header to remain unstripped during cross-origin redirects when not using urllib3's proxy support. The issue arises when a user sets this header inadvertently without a forwarding or tunneling proxy.
The CVSS score of 4.4 classifies this vulnerability as medium severity, indicating a potential risk to organizations. Although exploitation scenarios are deemed unlikely, the risk remains significant due to the potential exposure of sensitive information.
Organizations should prioritize patching immediately, especially if they are using affected versions of urllib3, Debian Linux, or Active IQ Unified Manager.
The vulnerability requires specific conditions to be exploited, including setting the `Proxy-Authorization` header without proxy support, not disabling HTTP redirects, and either using a non-HTTPS origin server or redirecting to a malicious origin.
For those unable to upgrade, mitigation strategies include using the `Proxy-Authorization` header with urllib3's `ProxyManager`, disabling HTTP redirects, or omitting the `Proxy-Authorization` header entirely.
Organizations should assess their usage of urllib3 and apply the latest patches to minimize the risk associated with this vulnerability.
Vulnerability Details
The vulnerability description indicates that the `Proxy-Authorization` header is not stripped during cross-origin redirects when not using urllib3's proxy features. This behavior could lead to accidental exposure of credentials in certain circumstances.
The affected products include urllib3, Debian Linux, and Active IQ Unified Manager. Users are advised to upgrade to urllib3 version 1.26.19 or 2.2.2 to mitigate this risk.
The vulnerability falls under CWE-669, which pertains to incorrect resource allocation, and is classified with a CVSS score of 4.4, indicating its medium severity.
Technical Analysis
The root cause of this vulnerability lies in the handling of the `Proxy-Authorization` header by urllib3. In scenarios where the header is set without proper proxy usage, the library does not treat the header as authentication material and fails to remove it during cross-origin redirects.
The attack vector is classified as NETWORK, with high attack complexity and high privileges required. User interaction is not needed, making this vulnerability more concerning.
The potential impact includes high confidentiality exposure, while integrity and availability remain unaffected. Organizations should closely monitor their configurations and header settings when using urllib3.
Risk & Impact Analysis
Risk to organizations includes potential exposure of sensitive credentials through misconfigured headers. The blast radius is limited but can affect any service utilizing the vulnerable versions of urllib3 or its components.
Given the CVSS score and the unlikely conditions required for exploitation, the urgency for remediation is moderate. Organizations should schedule remediation as part of their regular maintenance cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include all versions of urllib3 prior to 1.26.19 and all versions starting from 2.0.0 up to but not including 2.2.2. Debian Linux 11.0 and Active IQ Unified Manager are also impacted.
Mitigation & Remediation
To mitigate this vulnerability, users should upgrade to urllib3 version 1.26.19 or 2.2.2. If upgrading is not possible, users can configure their applications to use the `ProxyManager` for handling the `Proxy-Authorization` header or disable automatic redirects during HTTP requests.
Organizations should implement proper configurations to avoid unintended exposure of sensitive headers.
For more information on secure coding practices, organizations can refer to the secure coding practices guide.
Detection Guidance
Organizations should monitor their logs for any unusual behavior associated with the use of the `Proxy-Authorization` header. Additionally, watch for any failed requests that may indicate exploitation attempts.
Behavioral anomalies related to proxy configurations should also be logged and analyzed.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of proper header management in web applications. The trend towards increased reliance on proxy configurations necessitates a thorough understanding of how headers are processed.
Security teams should ensure that proper training is provided to developers regarding the use of proxy settings and header configurations to prevent similar vulnerabilities.
For further reading on best practices for vulnerability management, organizations can refer to the vulnerability management program design. Security teams should adopt a proactive approach to identify and remediate vulnerabilities in their applications.
Lastly, organizations should consider integrating continuous security testing into their development lifecycle to catch such vulnerabilities early on.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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