CVE-2023-27488— Envoy 输入验证错误漏洞
一分钟漏洞结论
影响对象
envoyproxy envoy
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Envoy是一款开源的分布式代理服务器。 Envoy 存在输入验证错误漏洞，该漏洞源于当为 ext_authz 过滤器配置了 时，可以升级权限。
可能的 ATT&CK 技术 1 AI
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一、 漏洞 CVE-2023-27488 基础信息
漏洞信息
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Vulnerability Title
Envoy gRPC client produces invalid protobuf when an HTTP header with non-UTF8 value is received.
来源: CVE Program / CVE List V5
Vulnerability 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`.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
来源: CVE Program / CVE List V5
Vulnerability Title
Envoy 输入验证错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 存在输入验证错误漏洞，该漏洞源于当为 ext_authz 过滤器配置了 `failure_mode_allow: true` 时，可以升级权限。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| envoyproxy | envoy | >= 1.25.0, <1.25.3 | - |
|
二、漏洞 CVE-2023-27488 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-27488 厂商安全公告 (1)
-
https://github.com/envoyproxy/envoy/security/advisories/GHSA-9g5w-hqr3-w2ph x_refsource_CONFIRM
同批安全公告 · envoyproxy · 2023-04-04 · 共 6 条
| CVE-2023-27487 | 8.2 HIGH | Envoy 输入验证错误漏洞 |
| CVE-2023-27493 | 8.1 HIGH | Envoy 环境问题漏洞 |
| CVE-2023-27496 | 6.5 MEDIUM | Envoy 输入验证错误漏洞 |
| CVE-2023-27491 | 5.4 MEDIUM | Envoy 环境问题漏洞 |
| CVE-2023-27492 | 4.8 MEDIUM | Envoy 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2023-27488
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