CVE-2025-61730
📋 TL;DR
This TLS 1.3 vulnerability in Go's crypto/tls library allows a network-local attacker to inject messages during handshake, potentially causing minor information disclosure when messages span encryption level boundaries. It affects applications using Go's TLS implementation for secure communications.
💻 Affected Systems
- Go programming language
- Applications using Go's crypto/tls package
📦 What is this software?
Go by Golang
Go by Golang
⚠️ Risk & Real-World Impact
Worst Case
Attacker could potentially intercept or manipulate small amounts of handshake data, though full session compromise is unlikely due to encryption boundaries.
Likely Case
Minor information leakage about handshake timing or message ordering, potentially revealing implementation details.
If Mitigated
With proper network segmentation and monitoring, impact is minimal as attacker must be network-local and timing is critical.
🎯 Exploit Status
Exploitation requires precise timing and network-local position during TLS handshake. No public exploits available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Go 1.24.0 or Go 1.23.7
Vendor Advisory: https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc
Restart Required: Yes
Instructions:
1. Update Go to version 1.24.0 or 1.23.7. 2. Recompile affected applications. 3. Restart services using the updated Go runtime.
🔧 Temporary Workarounds
Disable TLS 1.3
allConfigure applications to use TLS 1.2 instead of TLS 1.3
Set MinVersion: tls.VersionTLS12 in tls.Config
🧯 If You Can't Patch
- Implement strict network segmentation to limit potential attackers
- Monitor for unusual TLS handshake patterns or timing anomalies
🔍 How to Verify
Check if Vulnerable:
Check Go version with 'go version'. If version is below 1.24.0 and not 1.23.7, system is vulnerable.Check Version:
go versionVerify Fix Applied:
Verify Go version is 1.24.0 or 1.23.7 with 'go version' command.📡 Detection & Monitoring
Log Indicators:
- Unusual TLS handshake failures
- Multiple handshake attempts from same source
Network Indicators:
- Abnormal TLS 1.3 handshake timing
- Multiple messages in single records during handshake
SIEM Query:
tls.handshake AND (tls.version:1.3) AND (event.duration > threshold)