In short
- CVE-2021-44878 is a HIGH (CVSS 7.5) vulnerability affecting org.pac4j:pac4j-oidc, pac4j (pac4j).
- Chance of exploitation in the next 30 days (EPSS): 0.92%, higher than 60.6% of all vulnerabilities.
- Fix: update to 5.3.1, 4.5.5 or later.
| Package | Affected versions | Patched versions |
|---|
| org.pac4j:pac4j-oidc Maven | ≥ 5.0, < 5.3.1< 4.5.5
| 5.3.14.5.5
|
| pac4j | ≥ 5.0.0, < 5.3.1< 4.5.5
| 5.3.14.5.5
|
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.
NVD 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.
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