Undici up to 5.26.0 Header information disclosure

Summaryinfo

A vulnerability was found in Undici up to 5.26.0 and classified as critical. The affected element is an unknown function of the component Header Handler. Executing a manipulation can lead to an unknown weakness. This vulnerability is registered as CVE-2023-45143. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Undici up to 5.26.0 and classified as problematic. This vulnerability affects an unknown code of the component Header Handler. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Undici is an HTTP/1.1 client written from scratch for Node.js. Prior to version 5.26.2, Undici already cleared Authorization headers on cross-origin redirects, but did not clear `Cookie` headers. By design, `cookie` headers are forbidden request headers, disallowing them to be set in RequestInit.headers in browser environments. Since undici handles headers more liberally than the spec, there was a disconnect from the assumptions the spec made, and undici's implementation of fetch. As such this may lead to accidental leakage of cookie to a third-party site or a malicious attacker who can control the redirection target (ie. an open redirector) to leak the cookie to the third party site. This was patched in version 5.26.2. There are no known workarounds.

The weakness was published 10/12/2023 as GHSA-q768-x9m6-m9qp. The advisory is available at github.com. This vulnerability was named CVE-2023-45143 since 10/04/2023. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 216256 (Oracle Linux 8 : nodejs:20 (ELSA-2025-1351)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.26.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch e041de359221ebeae04c469e8aff4145764e6d76 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (216256). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Undici

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.16
• 5.17
• 5.18
• 5.19
• 5.20
• 5.21
• 5.22
• 5.23
• 5.24
• 5.25
• 5.26.0

License

• open-source

CPE 2.3info

• 🔍
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CPE 2.2info

• 🔍
• 🔍
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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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