Improper Authentication in Istio - CVE-2020-8843
Published: February 17, 2020
Vulnerability identifier: #VU25386
CSH Severity: Medium
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-8843
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in Mixer policy checks. Istio-proxy accepts x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to source equal to ingress. A remote attacker can bypass authentication process and gain unauthorized access to the application.
Affected software
Istio
How to mitigate CVE-2020-8843
Install updates from vendor's website.
Istio - update to 1.3.7