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CVE-2023-27493— Envoy doesn't escape HTTP header values

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Envoy 在生成请求标头时不会清理或转义请求属性。

CVSS 8.1 · High EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1071.001 · Web Protocols
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I. Basic Information for CVE-2023-27493

Vulnerability Information
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Vulnerability Title
Envoy doesn't escape HTTP header values
Source: 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, Envoy does not sanitize or escape request properties when generating request headers. This can lead to characters that are illegal in header values to be sent to the upstream service. In the worst case, it can cause upstream service to interpret the original request as two pipelined requests, possibly bypassing the intent of Envoy’s security policy. Versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9 contain a patch. As a workaround, disable adding request headers based on the downstream request properties, such as downstream certificate properties.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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Envoy 在生成请求标头时不会清理或转义请求属性。
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 >= 1.25.0, < 1.25.3 -

II. Public POCs for CVE-2023-27493

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III. Intelligence Information for CVE-2023-27493

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Vendor Advisories for CVE-2023-27493 (1)

Same Patch Batch · envoyproxy · 2023-04-04 · 6 CVEs total

CVE-2023-27487 8.2 HIGH Envoy client may fake the header `x-envoy-original-path`
CVE-2023-27496 6.5 MEDIUM Envoy may crash when a redirect url without a state param is received in the oauth filter
CVE-2023-27488 5.4 MEDIUM Envoy gRPC client produces invalid protobuf when an HTTP header with non-UTF8 value is rec
CVE-2023-27491 5.4 MEDIUM Envoy forwards invalid Http2/Http3 downstream headers
CVE-2023-27492 4.8 MEDIUM Envoy may crash when a large request body is processed in Lua filter

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-27493

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