Security restrictions bypass in Istio - CVE-2021-34824

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Main Vulnerability Database Vulnerabilities #VU54381

Security restrictions bypass in Istio - CVE-2021-34824

Published: June 25, 2021


Vulnerability identifier: #VU54381
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-34824
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Istio
Software vendor:
Istio

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to application does not properly impose security restrictions.

The Istio Gateway and DestinationRule can load private keys and certificates from Kubernetes secrets via the credentialName configuration. For Istio 1.8 and above, the secrets are conveyed from Istiod to gateways or workloads via the XDS API.

In the above approach, a gateway or workload deployment should only be able to access credentials (TLS certificates and private keys) stored in the Kubernetes secrets within its namespace. However, a bug in Istiod permits an authorized client the ability to access and retrieve any TLS certificate and private key cached in Istiod.


Remediation

Install updates from vendor's website.

External links