5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:P/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
0.002 Low
EPSS
Percentile
53.0%
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.
CPE | Name | Operator | Version |
---|---|---|---|
org.pac4j:pac4j-oidc | lt | 5.3.1 | |
org.pac4j:pac4j-oidc | lt | 4.5.5 |
github.com/advisories/GHSA-xhw6-hjc9-679m
github.com/pac4j/pac4j/commit/09684e0de1c4753d22c53b8135d4ef61cfda76f7
github.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281ae
github.com/pac4j/pac4j/commit/9c87bbc536ed5d05f940ae015403120df2935589
nvd.nist.gov/vuln/detail/CVE-2021-44878
openid.net/specs/openid-connect-core-1_0.html#IDToken
www.pac4j.org/4.5.x/docs/release-notes.html
www.pac4j.org/blog/cve_2021_44878_is_this_serious.html
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:P/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
0.002 Low
EPSS
Percentile
53.0%