CVE-2023-27488 Affecting servicemesh-proxy package, versions *


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.34% (71st percentile)

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  • Snyk IDSNYK-RHEL8-SERVICEMESHPROXY-5412782
  • published5 Apr 2023
  • disclosed4 Apr 2023

Introduced: 4 Apr 2023

CVE-2023-27488  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 servicemesh-proxy.

NVD Description

Note: Versions mentioned in the description apply only to the upstream servicemesh-proxy package and not the servicemesh-proxy package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1