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CVE-2023-27492— Envoy may crash when a large request body is processed in Lua filter

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。Lua是LUA团队的一款轻量级、扩展的开源脚本语言。 Envoy 存在安全漏洞，该漏洞源于Lua 过滤器容易受到拒绝服务攻击。

CVSS 4.8 · Medium EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-27492

Vulnerability Information
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Vulnerability Title
Envoy may crash when a large request body is processed in Lua filter
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, the Lua filter is vulnerable to denial of service. Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes. As of versions versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, Envoy no longer invokes the Lua coroutine if the filter has been reset. As a workaround for those whose Lua filter is buffering all requests/ responses, mitigate by using the buffer filter to avoid triggering the local reply in the Lua filter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
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。Lua是LUA团队的一款轻量级、扩展的开源脚本语言。 Envoy 存在安全漏洞，该漏洞源于Lua 过滤器容易受到拒绝服务攻击。
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-2023-27492

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III. Intelligence Information for CVE-2023-27492

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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-2023-27493 8.1 HIGH Envoy doesn't escape HTTP header values
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

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-770

V. Comments for CVE-2023-27492

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