CVE-2023-30636 – This vulnerability in TiKV allows remote attack... (How to Fix)

Q: What is the severity of CVE-2023-30636?

CVE-2023-30636 has a CVSS score of 7.5 (HIGH). This vulnerability in TiKV allows remote attackers to cause denial of service by triggering a fatal error when attempting to start a node while exceeding context deadlines. This affects TiKV clusters running vulnerable versions, potentially disrupting distributed database operations.

📋 TL;DR

This vulnerability in TiKV allows remote attackers to cause denial of service by triggering a fatal error when attempting to start a node while exceeding context deadlines. This affects TiKV clusters running vulnerable versions, potentially disrupting distributed database operations.

💻 Affected Systems

Products:

TiKV

Versions: 6.1.2 specifically (and potentially other versions with similar context handling)

Operating Systems: All platforms running TiKV

Default Config Vulnerable: ⚠️ Yes

Notes: Affects TiKV clusters where nodes may experience context deadline exceeded conditions during startup.

📦 What is this software?

Tikv by Tikv

View all CVEs affecting Tikv →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete cluster unavailability with RPC failures preventing data access and replication across nodes.

🟠

Likely Case

Partial service disruption affecting specific nodes or regions, causing temporary unavailability until nodes restart.

🟢

If Mitigated

Minimal impact with proper monitoring and automated recovery mechanisms in place.

🌐 Internet-Facing: MEDIUM - Requires network access to TiKV nodes but no authentication.

🏢 Internal Only: HIGH - Internal attackers or misconfigured services could easily trigger this condition.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Attack requires sending requests to trigger node startup while context deadlines are exceeded.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Versions after 6.1.2 (check latest releases)

Vendor Advisory: https://github.com/tikv/tikv/issues/14517

Restart Required: Yes

Instructions:

1. Check current TiKV version. 2. Update to latest patched version. 3. Restart TiKV nodes. 4. Verify cluster health.

🔧 Temporary Workarounds

Increase context timeouts

all

Configure longer context deadlines for node startup operations

Modify TiKV configuration to increase timeout values in context settings

Network segmentation

all

Restrict access to TiKV nodes to trusted networks only

Configure firewall rules to limit TiKV port access

🧯 If You Can't Patch

Implement strict network access controls to TiKV nodes
Deploy monitoring for context deadline exceeded errors and automate node recovery

🔍 How to Verify

Check if Vulnerable:

Check TiKV version and monitor logs for 'context deadline exceeded' errors during node startup

Check Version:

tikv-server --version

Verify Fix Applied:

Verify TiKV version is updated and test node startup under load

📡 Detection & Monitoring

Log Indicators:

"context deadline exceeded"
"not leader" errors
RpcStatus UNAVAILABLE messages

Network Indicators:

Increased failed RPC requests to TiKV nodes
Unusual node startup patterns

SIEM Query:

source="tikv.log" AND ("context deadline exceeded" OR "RpcStatus UNAVAILABLE")

📊 Metadata

CVE ID: CVE-2023-30636

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-770

Published: April 13, 2023

Last Updated: February 7, 2025

🔗 References

https://github.com/tikv/tikv/issues/14517 Exploit,Issue Tracking
https://github.com/tikv/tikv/issues/14517 Exploit,Issue Tracking

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🔗 Related Vulnerabilities

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