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Istio may not check inbound TCP connections against istio-policy

High severity GitHub Reviewed Published Feb 15, 2022 to the GitHub Advisory Database • Updated Sep 29, 2023

Package

gomod istio.io/istio (Go)

Affected versions

>= 1.1.0, < 1.1.7

Patched versions

1.1.7

Description

Istio 1.1.x through 1.1.6 has Incorrect Access Control. When disablePolicyChecks is set to false, inbound TCP connections do not generate Check requests to istio-policy and external authorization is not applied.

This behavior is a result of a change to istio/pilot/pkg/networking/plugin/mixer/mixer.go in 1.1.

References

Reviewed May 17, 2021
Published to the GitHub Advisory Database Feb 15, 2022
Last updated Sep 29, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:H/RL:O/RC:C

EPSS score

0.103%
(44th percentile)

Weaknesses

CVE ID

CVE-2019-12243

GHSA ID

GHSA-6g5f-f5pm-mjrg

Source code

No known source code
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