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Incorrect handling of internal redirects to routes with a direct response entry

High
mattklein123 published GHSA-7r5p-7fmh-jxpg Feb 22, 2022

Package

envoy (c++)

Affected versions

V1.21.0 and earlier

Patched versions

1.18.6, 1.19.3, 1.20.2, 1.21.1

Description

common router: envoy will segfault if route selected in result of internal redirect is direct_response

CVSS Score 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, High

Impact

Denial of Service (Crash)

Patches

Workarounds

Turn off internal redirects if direct response entries are configured on the same listener.

References

https://blog.envoyproxy.io
https://github.com/envoyproxy/envoy/releases

For more information

Open an issue in Envoy repo
Email us at envoy-security

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE ID

CVE-2022-21655

Weaknesses

No CWEs