Improper Authorization in Istio - CVE-2021-39156
Published: August 30, 2021
Vulnerability identifier: #VU56151
CSH Severity: High
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-39156
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to insufficient authorization checks. A remote attacker can send a specially crafted HTTP request with #fragment in the path and bypass authorization on the target system.
Affected software
Istio
servicemesh-proxy (Red Hat package)
servicemesh (Red Hat package)
servicemesh-proxy (Red Hat package)
servicemesh (Red Hat package)
How to mitigate CVE-2021-39156
Install updates from vendor's website.
Istio - addressed in versions 1.9.8, 1.10.4, 1.11.1
servicemesh-proxy (Red Hat package) - addressed in versions 1.1.17-2.el8, 2.0.7-3.el8
servicemesh (Red Hat package) - addressed in versions 1.1.17-3.el8, 2.0.7-3.el8
servicemesh-proxy (Red Hat package) - addressed in versions 1.1.17-2.el8, 2.0.7-3.el8
servicemesh (Red Hat package) - addressed in versions 1.1.17-3.el8, 2.0.7-3.el8