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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.011 (63.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/istio/istio/commits/master (Patch)
- istio.io/news/security/ (Vendor Advisory)
- istio.io/news/security/istio-security-2020-002/ (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.