Access Restriction Bypass Affecting envoyproxy/envoy package, versions [,1.22.9)[1.23.0,1.23.6)[1.24.0,1.24.4)[1.25.0,1.25.3)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Not Defined
EPSS
0.13% (50th percentile)

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  • Snyk IDSNYK-UNMANAGED-ENVOYPROXYENVOY-5411429
  • published5 Apr 2023
  • disclosed5 Apr 2023
  • creditphlax

Introduced: 5 Apr 2023

CVE-2023-27491  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade envoyproxy/envoy to version 1.22.9, 1.23.6, 1.24.4, 1.25.3 or higher.

Overview

Affected versions of this package are vulnerable to Access Restriction Bypass due to non-compliant HTTP/1 service that may allow malformed requests, potentially leading to a bypass of security policies.

PoC

Send an HTTP/2 or HTTP/3 request with invalid :method header such as :method: GET /admin.

CVSS Scores

version 3.1