CVE-2021-39156CWE-863

Fragments in Path May Lead to Authorization Policy Bypass

High · published August 24, 2021

CVSS v3.1
8.1
EPSS
1%
Percentile
67.4
In the wild
Unconfirmed
What it is

Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.01177 · 67.4th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2021-08-24T22:30Z
EPSS history
Timeline
  • 24 AUG 22:30Z
    Fragments in Path May Lead to Authorization Policy Bypass
    cvelistv5