PT-2022-11913 · Envoy · Envoy

Mattklein123 · Published 2022-02-22 · Updated 2024-03-06 · CVE-2021-43824

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Envoy (affected versions not specified)

Description The issue affects Envoy, an open source edge and service proxy for cloud-native applications. A crafted request can crash Envoy when a CONNECT request is sent to the JWT filter configured with regex match, providing a denial of service attack vector.

Recommendations As a temporary workaround, consider not using regex in the JWT filter until a patch is available. Users are advised to upgrade to a newer version to resolve the issue.

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BIT-ENVOY-2021-43824

CVE-2021-43824

GHSA-VJ5M-RCH8-5R2P

RHSA-2022:1275

RHSA-2022:1276

Affected Products

Envoy

References · 6

• https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253a · Patch
• https://osv.dev/vulnerability/CVE-2021-43824 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-43824 · Security Note
• https://osv.dev/vulnerability/BIT-envoy-2021-43824 · Vendor Advisory
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p · Note
• https://t.me/cibsecurity/37914 · Telegram Post