CVE-2019-25002
📋 TL;DR
This vulnerability in the sodiumoxide Rust crate allows cryptographic hash comparisons to always return true due to a flawed equality implementation. This affects any Rust application using sodiumoxide's generichash::Digest::eq function for cryptographic verification before version 0.2.5.
💻 Affected Systems
- sodiumoxide Rust crate
📦 What is this software?
Sodiumoxide by Sodiumoxide Project
⚠️ Risk & Real-World Impact
Worst Case
Complete cryptographic bypass allowing forged signatures, authentication bypass, or data integrity compromise in systems relying on hash comparisons for security decisions.
Likely Case
Cryptographic verification failures leading to potential authentication bypass or data integrity issues in applications using affected hash comparison functions.
If Mitigated
Limited impact if applications have additional validation layers or don't rely solely on the vulnerable comparison function.
🎯 Exploit Status
Exploitation requires the attacker to trigger hash comparison operations with malicious inputs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.2.5 and later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2019-0026.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to require sodiumoxide >=0.2.5
2. Run 'cargo update sodiumoxide'
3. Rebuild and redeploy application
4. Restart affected services
🔧 Temporary Workarounds
Manual hash comparison
allReplace vulnerable generichash::Digest::eq calls with manual byte-by-byte comparison
// Replace: digest1.eq(&digest2)
// With: digest1.as_ref() == digest2.as_ref()
🧯 If You Can't Patch
- Implement additional cryptographic validation layers beyond hash comparison
- Isolate affected components behind network segmentation
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or run 'cargo tree | grep sodiumoxide' to see if version <0.2.5 is usedCheck Version:
grep sodiumoxide Cargo.lock | head -1Verify Fix Applied:
Verify sodiumoxide version is >=0.2.5 in Cargo.lock and test hash comparison functionality📡 Detection & Monitoring
Log Indicators:
- Unexpected successful cryptographic verifications
- Failed authentication attempts followed by unexpected successes
Network Indicators:
- Unusual authentication patterns
- Suspicious cryptographic handshakes
SIEM Query:
source="application_logs" AND ("generichash" OR "sodiumoxide") AND ("eq" OR "comparison")