CVE-2020-8843: Input Validation
An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2020-8843?
The severity of CVE-2020-8843 is high.
How does CVE-2020-8843 affect Istio?
CVE-2020-8843 affects Istio versions 1.3 through 1.3.6.
What is the vulnerability description of CVE-2020-8843?
CVE-2020-8843 is a vulnerability in Istio where it is possible to bypass a specifically configured Mixer policy under certain circumstances.
How can CVE-2020-8843 be exploited?
CVE-2020-8843 can be exploited by using the x-istio-attributes header at ingress to affect policy decisions when Mixer policy selectively applies to a source.
How can CVE-2020-8843 be fixed?
To fix CVE-2020-8843, upgrade Istio to a version beyond 1.3.6.