CVE-2022-29228 – This vulnerability in Envoy's OAuth filter allo... (How to Fix)

Q: What is the severity of CVE-2022-29228?

CVE-2022-29228 has a CVSS score of 7.5 (HIGH). This vulnerability in Envoy's OAuth filter allows memory corruption or crashes when the filter incorrectly continues processing after sending a local response. It affects all Envoy deployments using the OAuth filter in versions before 1.22.1. The issue can lead to denial of service or potentially arbitrary code execution.

📋 TL;DR

This vulnerability in Envoy's OAuth filter allows memory corruption or crashes when the filter incorrectly continues processing after sending a local response. It affects all Envoy deployments using the OAuth filter in versions before 1.22.1. The issue can lead to denial of service or potentially arbitrary code execution.

💻 Affected Systems

Products:

Envoy Proxy

Versions: All versions prior to 1.22.1

Operating Systems: All platforms running Envoy

Default Config Vulnerable: ✅ No

Notes: Only vulnerable when OAuth filter is configured and active in the filter chain.

📦 What is this software?

Envoy by Envoyproxy

View all CVEs affecting Envoy →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Memory corruption could lead to remote code execution, allowing attackers to take control of the Envoy proxy instance.

🟠

Likely Case

Denial of service through Envoy process crashes or instability, disrupting proxy services.

🟢

If Mitigated

If OAuth filter is not used or proper network segmentation exists, impact is limited to potential service disruption.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires sending requests that trigger OAuth filter responses, but no public exploit code is known.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.22.1 and later

Vendor Advisory: https://github.com/envoyproxy/envoy/security/advisories/GHSA-rww6-8h7g-8jf6

Restart Required: Yes

Instructions:

1. Upgrade Envoy to version 1.22.1 or later. 2. Replace the Envoy binary with the patched version. 3. Restart Envoy service to apply the fix.

🔧 Temporary Workarounds

Disable OAuth Filter

all

Remove or disable the OAuth filter from Envoy configurations if not required.

Edit Envoy configuration YAML to remove OAuth filter from HTTP filter chains

🧯 If You Can't Patch

Implement network segmentation to restrict access to Envoy instances
Monitor for crashes or abnormal behavior in Envoy processes

🔍 How to Verify

Check if Vulnerable:

Check Envoy version and verify if OAuth filter is configured in the filter chain.

Check Version:

envoy --version

Verify Fix Applied:

Verify Envoy version is 1.22.1 or later and confirm OAuth filter behavior is corrected.

📡 Detection & Monitoring

Log Indicators:

Envoy process crashes
ASSERT() failures in logs
Memory corruption errors

Network Indicators:

Unusual OAuth-related request patterns
Increased 5xx errors from Envoy

SIEM Query:

source="envoy" AND ("ASSERT" OR "crash" OR "memory corruption")

📊 Metadata

CVE ID: CVE-2022-29228

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-617

Published: June 9, 2022

Last Updated: November 21, 2024

🔗 References

https://github.com/envoyproxy/envoy/commit/7ffda4e809dec74449ebc330cebb9d2f4ab61360 Patch,Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-rww6-8h7g-8jf6 Third Party Advisory
https://github.com/envoyproxy/envoy/commit/7ffda4e809dec74449ebc330cebb9d2f4ab61360 Patch,Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-rww6-8h7g-8jf6 Third Party Advisory

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🔗 Related Vulnerabilities

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