Requests 2.3.02.30.0 Leak ProxyAuth Headers
CVE-2023-32681 Published on May 26, 2023

Unintended leak of Proxy-Authorization header in requests
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.

NVD

Vulnerability Analysis

CVE-2023-32681 can be exploited with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
NONE

Weakness Type

What is an Information Disclosure Vulnerability?

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

CVE-2023-32681 has been classified to as an Information Disclosure vulnerability or weakness.


Products Associated with CVE-2023-32681

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-32681 are published in these products:

Python Requests
 
Fedora Project Fedora
 
Canonical Ubuntu Linux
 

Affected Versions

psf requests Version >= 2.3.0, < 2.31.0 is affected by CVE-2023-32681

Exploit Probability

EPSS
6.28%
Percentile
90.76%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.