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CVE-2023-35944— Envoy vulnerable to incorrect handling of HTTP requests and responses with mixed case schemes

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存在环境问题漏洞，该漏洞源于可以绕过某些请求，可能会导致使用混合大小写方案的请求被拒绝。

CVSS 8.2 · High EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol
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I. Basic Information for CVE-2023-35944

Vulnerability Information
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Vulnerability Title
Envoy vulnerable to incorrect handling of HTTP requests and responses with mixed case schemes
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Envoy allows mixed-case schemes in HTTP/2, however, some internal scheme checks are case-sensitive. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, this can lead to the rejection of requests with mixed-case schemes such as `htTp` or `htTps`, or the bypassing of some requests such as `https` in unencrypted connections. With a fix in versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, Envoy will now lowercase scheme values by default, and change the internal scheme checks that were case-sensitive to be case-insensitive. There are no known workarounds for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy存在环境问题漏洞，该漏洞源于可以绕过某些请求，可能会导致使用混合大小写方案的请求被拒绝。
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 >= 1.26.0, < 1.26.4 -

II. Public POCs for CVE-2023-35944

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III. Intelligence Information for CVE-2023-35944

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Vendor Advisories for CVE-2023-35944 (1)

Same Patch Batch · envoyproxy · 2023-07-25 · 4 CVEs total

CVE-2023-35941 8.6 HIGH Envoy vulnerable to OAuth2 credentials exploit with permanent validity
CVE-2023-35942 6.5 MEDIUM Envoy's gRPC access log crash caused by the listener draining
CVE-2023-35943 6.3 MEDIUM Envoy vulnerable to CORS filter segfault when origin header is removed

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-20

V. Comments for CVE-2023-35944

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