CVE-2021-44878

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-44878
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.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.0 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:L/Au:N/C:N/I:P/A:N

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References
Link Resource
https://github.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281ae Patch Third Party Advisory
https://openid.net/specs/openid-connect-core-1_0.html#IDToken Product Third Party Advisory
https://www.pac4j.org/blog/cve_2021_44878_is_this_serious.html Mitigation Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
History

13 May 2022, 15:51

Type Values Removed Values Added
References (MISC) https://www.pac4j.org/blog/cve_2021_44878_is_this_serious.html - (MISC) https://www.pac4j.org/blog/cve_2021_44878_is_this_serious.html - Mitigation, Vendor Advisory

30 Mar 2022, 02:15

Type Values Removed Values Added
References
  • (MISC) https://www.pac4j.org/blog/cve_2021_44878_is_this_serious.html -
Summary Pac4j v5.1 and earlier allows (by default) clients to accept and successfully validate ID Tokens with "none" algorithm (i.e., tokens with no signature) 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. 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.

14 Jan 2022, 16:34

Type Values Removed Values Added
References (MISC) https://openid.net/specs/openid-connect-core-1_0.html#IDToken - (MISC) https://openid.net/specs/openid-connect-core-1_0.html#IDToken - Product, Third Party Advisory
References (MISC) https://github.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281ae - (MISC) https://github.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281ae - Patch, Third Party Advisory
CWE CWE-347
CPE cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : 5.0
v3 : 7.5
First Time Pac4j
Pac4j pac4j

06 Jan 2022, 13:29

Type Values Removed Values Added
New CVE
Information

Published : 2022-01-06 13:15

Updated : 2023-12-10 14:09

NVD link : CVE-2021-44878

Mitre link : CVE-2021-44878

CVE.ORG link : CVE-2021-44878

JSON object : View

Products Affected

pac4j

  • pac4j
CWE
CWE-347

Improper Verification of Cryptographic Signature