CVE-2021-39156 Fragments in Path May Lead to Authorization Policy Bypass

2021-08-2422:30:12

CWE-863

GitHub_M

www.cve.org

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

8.3 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

53.6%

JSON

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.

CNA Affected

[
  {
    "product": "istio",
    "vendor": "istio",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.9.8"
      },
      {
        "status": "affected",
        "version": ">= 1.10.0, < 1.10.4"
      },
      {
        "status": "affected",
        "version": ">= 1.11.0, < 1.11.1"
      }
    ]
  }
]