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CVE-2024-32475— Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytes

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy是一款开源的分布式代理服务器。 Envoy 1.30.1之前、1.29.4之前、1.28.3之前、1.27.5之前版本存在安全漏洞，该漏洞源于当使用启用了 auto_sni 的上游 TLS 集群时，长度超过 255 个字符的 host/:authority 标头的请求会导致 Envoy 进程异常终止。

CVSS 7.5 · High EPSS 0.69% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-32475

Vulnerability Information
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Vulnerability Title
Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytes
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a cloud-native, open source edge and service proxy. When an upstream TLS cluster is used with `auto_sni` enabled, a request containing a `host`/`:authority` header longer than 255 characters triggers an abnormal termination of Envoy process. Envoy does not gracefully handle an error when setting SNI for outbound TLS connection. The error can occur when Envoy attempts to use the `host`/`:authority` header value longer than 255 characters as SNI for outbound TLS connection. SNI length is limited to 255 characters per the standard. Envoy always expects this operation to succeed and abnormally aborts the process when it fails. This vulnerability is fixed in 1.30.1, 1.29.4, 1.28.3, and 1.27.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对函数返回值的检查不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 1.30.1之前、1.29.4之前、1.28.3之前、1.27.5之前版本存在安全漏洞，该漏洞源于当使用启用了 auto_sni 的上游 TLS 集群时，长度超过 255 个字符的 host/:authority 标头的请求会导致 Envoy 进程异常终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.30.0, < 11.30.1 -

II. Public POCs for CVE-2024-32475

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III. Intelligence Information for CVE-2024-32475

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Patches & Fixes for CVE-2024-32475 (1)

Vendor Advisories for CVE-2024-32475 (1)

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-253

V. Comments for CVE-2024-32475

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