CVE-2022-29930
📋 TL;DR
This CVE describes a critical vulnerability in JetBrains Ktor Native 2.0.0 where the SHA1 implementation returned the same hash value for all inputs, completely breaking cryptographic integrity. This affects any application using Ktor Native 2.0.0 for cryptographic operations, authentication, or data integrity verification. The vulnerability was fixed in version 2.0.1.
💻 Affected Systems
- JetBrains Ktor Native
📦 What is this software?
Ktor by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of cryptographic security leading to authentication bypass, data tampering, and impersonation attacks across all systems using affected Ktor implementations.
Likely Case
Authentication bypass, session hijacking, and data integrity violations in applications relying on SHA1 hashing for security functions.
If Mitigated
Limited impact if applications have additional security layers, but cryptographic operations remain fundamentally broken.
🎯 Exploit Status
The vulnerability is trivial to exploit - any SHA1 hash will match any other SHA1 hash. No special tools or techniques required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.1
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: Yes
Instructions:
1. Update Ktor Native dependency to version 2.0.1 or later. 2. Rebuild and redeploy your application. 3. Restart any running services using Ktor Native.
🔧 Temporary Workarounds
Disable SHA1 usage
allReplace SHA1 hashing with alternative secure hash functions (SHA-256, SHA-3) in application code
Modify application code to use different hash algorithms
🧯 If You Can't Patch
- Implement additional authentication layers (multi-factor authentication)
- Monitor for anomalous authentication patterns and hash collisions
🔍 How to Verify
Check if Vulnerable:
Check if your application uses Ktor Native version 2.0.0 in dependency files (build.gradle.kts, pom.xml, etc.)Check Version:
Check build configuration files or run: ./gradlew dependencies | grep ktor (for Gradle projects)Verify Fix Applied:
Verify Ktor Native version is 2.0.1 or later in dependency files and rebuilt application📡 Detection & Monitoring
Log Indicators:
- Multiple successful authentications with identical hash values
- Hash collision warnings in security logs
Network Indicators:
- Unusual authentication patterns
- Multiple sessions from different credentials showing identical hash values
SIEM Query:
Search for authentication events where hash values are identical across different users or sessions