CVE-2022-23551 AAD Pod Identity obtaining token with backslash

2022-12-2119:50:15

CWE-1259

CWE-863

GitHub_M

www.cve.org

cve-2022-23551

aad pod identity

nmi component

regex validation

imds

aks

pod-managed identities add-on

security issue

fix

version 1.8.13

CVSS3

5.3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

HIGH

Availability Impact

LOW

CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L

AI Score

5.5

Confidence

High

EPSS

0.001

Percentile

40.1%

JSON

aad-pod-identity assigns Azure Active Directory identities to Kubernetes applications and has now been deprecated as of 24 October 2022. The NMI component in AAD Pod Identity intercepts and validates token requests based on regex. In this case, a token request made with backslash in the request (example: /metadata/identity\oauth2\token/) would bypass the NMI validation and be sent to IMDS allowing a pod in the cluster to access identities that it shouldn’t have access to. This issue has been fixed and has been included in AAD Pod Identity release version 1.8.13. If using the AKS pod-managed identities add-on, no action is required. The clusters should now be running the version 1.8.13 release.

CNA Affected

[
  {
    "vendor": "Azure",
    "product": "aad-pod-identity",
    "versions": [
      {
        "version": "< 1.8.13",
        "status": "affected"
      }
    ]
  }
]