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Istio Authorization Bypass Vulnerability

Moderate severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Aug 7, 2023
Withdrawn This advisory was withdrawn on Aug 7, 2023

Package

gomod istio.io/istio (Go)

Affected versions

< 1.8.6
>= 1.9.0, <= 1.9.4

Patched versions

1.8.6
1.9.5

Description

Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.

References

Published by the National Vulnerability Database May 27, 2021
Published to the GitHub Advisory Database May 24, 2022
Reviewed Jul 11, 2023
Last updated Aug 7, 2023
Withdrawn Aug 7, 2023

Severity

Moderate
6.5
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weaknesses

CVE ID

CVE-2021-31920

GHSA ID

GHSA-6q5m-22mq-q2xv

Source code

No known source code
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