Information disclosure in Azure Active Directory Pod Identity

1) Information disclosure

EUVDB-ID: #VU49490

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1677

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The AAD pod identity enables users to assign identities to pods in Kubernetes clusters and fetch them from the pods using a regular IMDS (Azure Instance Metadata Service) request. When an identity is assigned to a pod, the pod can access to the IMDS endpoint and get a token of that identity. An attacker who successfully exploited this vulnerability can laterally steal the identities that are associated with different pods.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Azure Active Directory Pod Identity for Kubernets: 1.5 - 1.6.3

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1677

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.