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Basic Authentication can be bypassed using a malformed username

Moderate
stnoonan published GHSA-ww8q-72rx-hc54 Feb 26, 2021

Package

spnego-http-auth-nginx-module (nginx)

Affected versions

< 1.1

Patched versions

1.1.1

Description

Impact

Users of spnego-http-auth-nginx-module that have enabled basic authentication

Patches

Upgrade to published version 1.1.1 or patch a06f9ef into your version.

Workarounds

Disable basic authentication.

For more information

If you have any questions or comments about this advisory:

Disclosure

Thanks to Prakapovich Pavel aka Flyguy.by (flyguy.by@gmail.com) for the disclosure.

Severity

Moderate

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
Low
Integrity
None
Availability
None

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVE ID

CVE-2021-21335

Weaknesses

No CWEs