CVE-2019-3728
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in RSA BSAFE cryptographic libraries when processing DSA signatures. A remote attacker could exploit this to cause a denial-of-service crash in affected systems. Organizations using RSA BSAFE Crypto-C Micro Edition, Micro Edition Suite, or Crypto-C versions within specified ranges are vulnerable.
💻 Affected Systems
- RSA BSAFE Crypto-C Micro Edition
- RSA BSAFE Micro Edition Suite
- RSA Crypto-C
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, though this is not explicitly stated in the CVE description.
Likely Case
Denial-of-service through application/library crash, potentially disrupting cryptographic operations.
If Mitigated
Limited impact if proper network segmentation and access controls prevent malicious actors from reaching vulnerable systems.
🎯 Exploit Status
Exploitation requires sending specially crafted DSA signatures to trigger the out-of-bounds read.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Crypto-C Micro Edition: 4.0.5.4+, 4.1.4+; Micro Edition Suite: 4.0.13+, 4.4+; Crypto-C: 6.5+
Vendor Advisory: https://www.dell.com/support/kbdoc/000194054
Restart Required: Yes
Instructions:
1. Identify affected RSA BSAFE library versions. 2. Obtain updated libraries from Dell/RSA. 3. Replace vulnerable libraries with patched versions. 4. Restart applications/services using the libraries.
🔧 Temporary Workarounds
Disable DSA Signature Processing
allIf DSA signatures are not required, disable DSA signature verification in applications using affected libraries.
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using vulnerable libraries from untrusted networks.
- Deploy web application firewalls (WAFs) or intrusion prevention systems (IPS) to detect and block malicious DSA signature traffic.
🔍 How to Verify
Check if Vulnerable:
Check application/library dependencies for RSA BSAFE library versions within affected ranges.Check Version:
Platform-specific commands vary; check application documentation or use system package managers (e.g., rpm -qa | grep -i rsa, dpkg -l | grep -i rsa).Verify Fix Applied:
Verify installed RSA BSAFE library versions are at or above patched versions: Crypto-C Micro Edition 4.0.5.4/4.1.4+, Micro Edition Suite 4.0.13/4.4+, Crypto-C 6.5+.📡 Detection & Monitoring
Log Indicators:
- Application crashes or abnormal terminations related to cryptographic operations
- Error logs mentioning RSA BSAFE libraries or DSA signature failures
Network Indicators:
- Unusual network traffic patterns to systems using RSA BSAFE libraries, especially involving DSA signature exchanges
SIEM Query:
Example: 'application:(rsa OR bsafe) AND (crash OR error OR termination)'