CVE-2023-27488
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- CVE-2023-27488
CVE Details
| Release Date: | 2023-04-04 |
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.
See more information about CVE-2023-27488 from MITRE CVE dictionary and NIST NVD
CVSS v3.0 metrics
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
| Base Score: | 9.8 | Base Metrics: | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Access Vector: | Network | Attack Complexity: | Low |
| Privileges Required: | None | User Interaction: | None |
| Scope: | Unchanged | Confidentiality Impact: | High |
| Integrity Impact: | High | Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 7 (istio) | ELSA-2023-12355 | 2023-06-02 |
| Oracle Linux version 7 (istio) | ELSA-2023-12357 | 2023-06-02 |
| Oracle Linux version 7 (kubernetes) | ELSA-2023-12355 | 2023-06-02 |
| Oracle Linux version 7 (kubernetes) | ELSA-2023-12357 | 2023-06-02 |
| Oracle Linux version 7 (olcne) | ELSA-2023-12355 | 2023-06-02 |
| Oracle Linux version 7 (olcne) | ELSA-2023-12357 | 2023-06-02 |
| Oracle Linux version 7 (olcne) | ELSA-2023-23649 | 2023-06-02 |
| Oracle Linux version 8 (istio) | ELSA-2023-12354 | 2023-06-02 |
| Oracle Linux version 8 (istio) | ELSA-2023-12356 | 2023-06-02 |
| Oracle Linux version 8 (kubernetes) | ELSA-2023-12354 | 2023-06-02 |
| Oracle Linux version 8 (kubernetes) | ELSA-2023-12356 | 2023-06-02 |
| Oracle Linux version 8 (olcne) | ELSA-2023-12354 | 2023-06-02 |
| Oracle Linux version 8 (olcne) | ELSA-2023-12356 | 2023-06-02 |
| Oracle Linux version 8 (olcne) | ELSA-2023-23648 | 2023-06-02 |
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