Security Bulletin
Summary
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.
Vulnerability Details
CVEID: CVE-2021-44878
DESCRIPTION: pac4j could allow a remote attacker to bypass security restrictions, caused by improper validation for ID Tokens with "none" algorithm. By injecting a specially-crafted ID token using "none" as the value of "alg" key, an attacker could exploit this vulnerability to bypass the token validation.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/216856 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM Cloud Pak for Watson AIOps | 3.x |
Remediation/Fixes
Address the vulnerabilities now for all affected products/versions listed above by installing Fix:
https://www.ibm.com/docs/en/cloud-paks/cloud-pak-watson-aiops/3.4.2?topic=upgrading
Workarounds and Mitigations
None
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References
Change History
12 Sep 2022: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
Document Location
Worldwide
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Document Information
Modified date:
14 September 2022
Initial Publish date:
12 September 2022
UID
ibm16620343