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Exposure of Sensitive Information to an Unauthorized Actor in urllib3

Critical severity GitHub Reviewed Published Dec 12, 2018 to the GitHub Advisory Database • Updated Sep 7, 2023

Package

pip urllib3 (pip)

Affected versions

< 1.23

Patched versions

1.23

Description

urllib3 before version 1.23 does not remove the Authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the Authorization header to be exposed to unintended hosts or transmitted in cleartext.

References

Published by the National Vulnerability Database Dec 11, 2018
Published to the GitHub Advisory Database Dec 12, 2018
Reviewed Jun 16, 2020
Last updated Sep 7, 2023

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.504%
(77th percentile)

Weaknesses

CVE ID

CVE-2018-20060

GHSA ID

GHSA-www2-v7xj-xrc6

Source code

No known source code
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