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CVE-2021-44878

7.5 · HIGH

If an OpenID Connect provider supports the "none" algorithm (i.e., tokens with no signature), pac4j v5.3.0 (and prior) does not refuse it without an explicit configuration on its side or for the "i…

Published Jan 6, 2022CWE-347EPSS 0.90%

Overview

CVE-2021-44878 is a high-severity vulnerability. It was published on January 6, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

If an OpenID Connect provider supports the "none" algorithm (i.e., tokens with no signature), pac4j v5.3.0 (and prior) does not refuse it without an explicit configuration on its side or for the "idtoken" response type which is not secure and violates the OpenID Core Specification. The "none" algorithm does not require any signature verification when validating the ID tokens, which allows the attacker to bypass the token validation by injecting a malformed ID token using "none" as the value of "alg" key in the header with an empty signature value.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281aeRefopenid.net/specs/openid-connect-core-1_0.html#IDTokenRefwww.pac4j.org/blog/cve_2021_44878_is_this_serious.htmlGitHubgithub.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281aeRefopenid.net/specs/openid-connect-core-1_0.html#IDTokenRefwww.pac4j.org/blog/cve_2021_44878_is_this_serious.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-44878?

CVE-2021-44878 is a high-severity vulnerability. It was published on January 6, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-44878?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-44878?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-44878?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-44878 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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