PT-2021-19595 · Istio · Istio

Ruilin + 1 · Published 2021-05-27 · Updated 2022-07-12 · CVE-2021-31920

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions: Istio versions 1.8.0 through 1.8.6 Istio versions 1.9.0 through 1.9.5

Description: The issue allows an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) to potentially bypass an authorization policy when path-based authorization rules are used. This could lead to unauthorized access.

Recommendations: For Istio versions 1.8.0 through 1.8.5, update to version 1.8.6. For Istio versions 1.9.0 through 1.9.4, update to version 1.9.5.

Exploit

Fix

Incorrect Authorization

Weakness Enumeration

CWE-706

CWE-863

Related Identifiers

CVE-2021-31920

GHSA-6Q5M-22MQ-Q2XV

RHSA-2021:1538

RHSA-2021:1540

Affected Products

Istio

References · 10

• 🔥 https://istio.io/latest/news/security/istio-security-2021-005 · Exploit
• https://linux.oracle.com/errata/ELSA-2021-9397.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31920 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-31920 · Security Note
• https://linux.oracle.com/errata/ELSA-2021-9399.html · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2021-9396.html · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2021-9398.html · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-6q5m-22mq-q2xv · Vendor Advisory
• https://t.me/cvenotify/15147 · Telegram Post
• https://t.me/cvenotify/15746 · Telegram Post