CVE-2019-5186 Explained : Impact and Mitigation
Learn about CVE-2019-5186, a stack buffer overflow vulnerability in the iocheckd service of WAGO PFC 200, allowing attackers to crash the service by sending crafted packets.
A vulnerability has been found in the iocheckd service "I/O-Check" feature of WAGO PFC 200, allowing for a stack buffer overflow attack.
Understanding CVE-2019-5186
What is CVE-2019-5186?
This CVE identifies a stack buffer overflow vulnerability in the iocheckd service "I/O-Check" functionality of WAGO PFC 200.
The Impact of CVE-2019-5186
The vulnerability can be exploited by an attacker to crash the service by sending a specially crafted packet that triggers the parsing of a cache file.
Technical Details of CVE-2019-5186
Vulnerability Description
- The vulnerability arises from a stack buffer overflow in the iocheckd service "I/O-Check" feature of WAGO PFC 200.
Affected Systems and Versions
- Product: Wago
- Vendor: n/a
- Affected Version: WAGO PFC200 Firmware version 03.02.02(14)
Exploitation Mechanism
- Attacker sends a specially crafted packet to trigger parsing of a cache file
- Vulnerable code located at address 0x1eb9c
- Exploitation involves overflowing the destination buffer with a crafted interface element name
- Crash occurs when the interface value length exceeds a specific threshold
Mitigation and Prevention
Immediate Steps to Take
- Apply vendor patches or updates to address the vulnerability
- Implement network segmentation to limit exposure
Long-Term Security Practices
- Regularly update firmware and software to the latest versions
- Conduct security assessments and penetration testing to identify vulnerabilities
Patching and Updates
- Check for security advisories from the vendor and apply patches promptly