What is CVE-2020-8843?

CVE-2020-8843 is a high-severity vulnerability in Istio, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2020-02-14.

How severe is CVE-2020-8843?

High severity. CVSS v3 base score is 7.4 out of 10.

Improper input validation in Istio

CVE-2020-8843

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.011 (61.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Istio
N/a — versions n/a

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

cve@mitre.org (Patch, x_refsource_MISC)
cve@mitre.org (x_refsource_MISC, Vendor Advisory)
cve@mitre.org (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2020-8843?: CVE-2020-8843 is a high-severity vulnerability in Istio, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2020-02-14.
How severe is CVE-2020-8843?: High severity. CVSS v3 base score is 7.4 out of 10.