CVE-2017-7902 : Vulnerability Insights and Analysis
Discover the security flaw in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 controllers due to nonce reuse. Learn about the impact, affected versions, and mitigation steps.
A security flaw named "Reusing a Nonce, Key Pair in Encryption" has been identified in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 programmable-logic controllers.
Understanding CVE-2017-7902
This CVE involves a vulnerability in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 devices due to the reuse of nonces, potentially enabling attackers to intercept and replay legitimate requests.
What is CVE-2017-7902?
The vulnerability allows attackers to exploit the reuse of nonces in the affected programmable-logic controllers, compromising the security of the systems.
The Impact of CVE-2017-7902
- Attackers can intercept and replay legitimate requests until the nonce changes, potentially leading to unauthorized access and control of the devices.
Technical Details of CVE-2017-7902
This section provides detailed technical information about the CVE.
Vulnerability Description
The flaw arises from the reuse of nonces in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 devices, allowing for potential interception and replay attacks.
Affected Systems and Versions
- Rockwell Automation Allen-Bradley MicroLogix 1100: Versions 1763-L16AWA, Series A and B, Version 16.00, and earlier
- Rockwell Automation Allen-Bradley MicroLogix 1400: Versions 1766-L32AWA, Series A and B, Version 16.00, and earlier
Exploitation Mechanism
The vulnerability stems from the reuse of nonces, enabling attackers to capture and replay valid requests until the nonce changes.
Mitigation and Prevention
Protecting systems from CVE-2017-7902 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Implement network segmentation to isolate vulnerable devices
- Monitor network traffic for any suspicious activity
- Apply vendor-supplied patches or updates
Long-Term Security Practices
- Regularly update firmware and software to the latest versions
- Conduct security assessments and penetration testing to identify vulnerabilities
- Educate users on best security practices and awareness
Patching and Updates
- Apply patches provided by Rockwell Automation to address the nonce reuse vulnerability