Auth bypass in Istio
CVE-2020-8595
Istio versions 1.2.10 (End of Life) and prior, 1.3 through 1.3.7, and 1.4 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.026 (84.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000
Affected products
- Istio
- Red Hat Enterprise Linux — versions 8.0
- Red Hat Openshift Service Mesh — versions 1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/istio/istio/commits/master (Patch)
- istio.io/news/security/ (Vendor Advisory)
- access.redhat.com/errata/RHSA-2020:0477 (vendor-advisory, Third Party Advisory)
- access.redhat.com/security/cve/cve-2020-8595 (Third Party Advisory, Mitigation)
- istio.io/news/security/istio-security-2020-001/ (Patch, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Mitigation, Issue Tracking)
Frequently asked questions
- What is CVE-2020-8595?
- CVE-2020-8595 is a high-severity vulnerability in Istio, classified under Improper Authentication. CVSS score: 7.3/10. Published 2020-02-12.
- How severe is CVE-2020-8595?
- High severity. CVSS v3 base score is 7.3 out of 10.
- Is CVE-2020-8595 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.