Requests is a HTTP library. Since Requests 2.3.0, Requests has been leaking Proxy-Authorization headers to destination servers when redirected to an HTTPS endpoint. This is a product of how we use `rebuild_proxies` to reattach the `Proxy-Authorization` header to requests. For HTTP connections sent through the tunnel, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the `Proxy-Authorization` header must be sent in the CONNECT request as the proxy has no visibility into the tunneled request. This results in Requests forwarding proxy credentials to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate sensitive information. This issue has been patched in version 2.31.0.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2023-05-26T17:02:52.899Z

Updated: 2024-08-02T15:25:36.610Z

Reserved: 2023-05-11T16:33:45.731Z

Link: CVE-2023-32681

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-05-26T18:15:14.147

Modified: 2024-11-21T08:03:50.377

Link: CVE-2023-32681

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-05-23T00:00:00Z

Links: CVE-2023-32681 - Bugzilla