Improper Authorization in Istio - CVE-2021-31920
Published: May 25, 2021
Vulnerability identifier: #VU53524
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2021-31920
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Istio
Affected software:
Istio
Istio
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to improper input validation when processing HTTP request path with multiple slashes or escaped slash characters (%2F or %5C). A remote attacker can bypass Istio authorization policy when path based authorization rules are used.
How to mitigate CVE-2021-31920
Install updates from vendor's website.