CVE-2023-27488

Published Apr 4, 2023

Last updated a year ago

Overview

Description: Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, escalation of privileges is possible when `failure_mode_allow: true` is configured for `ext_authz` filter. For affected components that are used for logging and/or visibility, requests may not be logged by the receiving service. When Envoy was configured to use ext_authz, ext_proc, tap, ratelimit filters, and grpc access log service and an http header with non-UTF-8 data was received, Envoy would generate an invalid protobuf message and send it to the configured service. The receiving service would typically generate an error when decoding the protobuf message. For ext_authz that was configured with ``failure_mode_allow: true``, the request would have been allowed in this case. For the other services, this could have resulted in other unforeseen errors such as a lack of visibility into requests. As of versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, Envoy by default sanitizes the values sent in gRPC service calls to be valid UTF-8, replacing data that is not valid UTF-8 with a `!` character. This behavioral change can be temporarily reverted by setting runtime guard `envoy.reloadable_features.service_sanitize_non_utf8_strings` to false. As a workaround, one may set `failure_mode_allow: false` for `ext_authz`.
Source: security-advisories@github.com
NVD status: Modified

Risk scores

CVSS 3.1

Type: Primary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Weaknesses

nvd@nist.gov: NVD-CWE-noinfo
security-advisories@github.com: CWE-20

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "DAD93214-C958-4A69-9291-15D1C22CFD3F",
            "versionEndExcluding": "1.22.9"
          },
          {
            "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "17BFB303-DA5A-4E83-93F7-3C1EA340E434",
            "versionEndExcluding": "1.23.6",
            "versionStartIncluding": "1.23.0"
          },
          {
            "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "92B633B8-FA4A-4630-9302-96F2C8336E36",
            "versionEndExcluding": "1.24.4",
            "versionStartIncluding": "1.24.0"
          },
          {
            "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "8AFC6741-6FDF-47F6-A4AF-B5F5233ABB71",
            "versionEndExcluding": "1.25.3",
            "versionStartIncluding": "1.25.0"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

Overview

Risk scores

CVSS 3.1

Weaknesses

Social media

Configurations

References