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CVE-2024-23326— Envoy incorrectly accepts HTTP 200 response for entering upgrade mode

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 1.30.2之前版本存在安全漏洞，该漏洞源于可以诱骗服务器将升级标头添加到响应中，从而导致发生请求走私。

CVSS 5.9 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1102 · Web Service
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I. Basic Information for CVE-2024-23326

Vulnerability Information
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Vulnerability Title
Envoy incorrectly accepts HTTP 200 response for entering upgrade mode
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a cloud-native, open source edge and service proxy. A theoretical request smuggling vulnerability exists through Envoy if a server can be tricked into adding an upgrade header into a response. Per RFC https://www.rfc-editor.org/rfc/rfc7230#section-6.7 a server sends 101 when switching protocols. Envoy incorrectly accepts a 200 response from a server when requesting a protocol upgrade, but 200 does not indicate protocol switch. This opens up the possibility of request smuggling through Envoy if the server can be tricked into adding the upgrade header to the response.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经检查的错误条件
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 1.30.2之前版本存在安全漏洞，该漏洞源于可以诱骗服务器将升级标头添加到响应中，从而导致发生请求走私。
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 >= 1.13.0, <= 1.30.1 -

II. Public POCs for CVE-2024-23326

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III. Intelligence Information for CVE-2024-23326

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Vendor Advisories for CVE-2024-23326 (1)

Same Patch Batch · envoyproxy · 2024-06-04 · 7 CVEs total

CVE-2024-32976 7.5 HIGH Envoy can enter an endless loop while decompressing Brotli data with extra input
CVE-2024-34363 7.5 HIGH Envoy can crash due to uncaught nlohmann JSON exception
CVE-2024-32974 5.9 MEDIUM Envoy affected by a crash in EnvoyQuicServerStream::OnInitialHeadersComplete()
CVE-2024-32975 5.9 MEDIUM Envoy crashes in QuicheDataReader::PeekVarInt62Length()
CVE-2024-34362 5.9 MEDIUM Envoy affected by a crash (use-after-free) in EnvoyQuicServerStream
CVE-2024-34364 5.7 MEDIUM Envoy OOM vector from HTTP async client with unbounded response buffer for mirror response

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-391

V. Comments for CVE-2024-23326

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