CVE-2020-8843

HIGH

Istio 1.3.0-1.3.6 - Policy Bypass via x-istio-attributes Header

Title source: llm
STIX 2.1

Description

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.

References (3)

Core 3
Core References
Vendor Advisory x_refsource_misc
https://istio.io/news/security/
Vendor Advisory x_refsource_confirm
https://istio.io/news/security/istio-security-2020-002/

Scores

CVSS v3 7.4
EPSS 0.0106
EPSS Percentile 60.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Details

CWE
CWE-20
Status published
Products (1)
istio/istio 1.3.0 - 1.3.6
Published Feb 14, 2020
Tracked Since Feb 18, 2026