CVE-2020-5137 : Vulnerability Insights and Analysis
Learn about CVE-2020-5137, a buffer overflow vulnerability in SonicOS by SonicWall allowing remote unauthenticated attackers to cause Denial of Service (DoS) and firewall crashes.
A buffer overflow vulnerability in SonicOS allows a remote unauthenticated attacker to cause Denial of Service (DoS) on the firewall SSLVPN service and leads to firewall crash. This vulnerability affected SonicOS Gen 5 version 5.9.1.7, 5.9.1.13, Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v, and Gen 7 version 7.0.0.0.
Understanding CVE-2020-5137
This CVE involves a buffer overflow vulnerability in SonicOS that can be exploited by remote attackers.
What is CVE-2020-5137?
The vulnerability in SonicOS allows unauthenticated remote attackers to trigger a DoS condition on the SSLVPN service, potentially leading to a firewall crash.
The Impact of CVE-2020-5137
- Remote unauthenticated attackers can exploit the vulnerability to cause a DoS on the firewall SSLVPN service.
- The exploit can lead to a firewall crash, impacting network security and availability.
Technical Details of CVE-2020-5137
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability is a buffer overflow issue in SonicOS, enabling attackers to disrupt the SSLVPN service and potentially crash the firewall.
Affected Systems and Versions
The following versions of SonicOS by SonicWall are affected:
- SonicOS 6.5.4.7-79n and earlier
- SonicOS 5.9.1.7-2n and earlier
- SonicOS 5.9.1.13-5n and earlier
- SonicOS 6.5.1.11-4n and earlier
- SonicOS 6.0.5.3-93o and earlier
- SonicOSv 6.5.4.4-44v-21-794 and earlier
- SonicOS 7.0.0.0-1
Exploitation Mechanism
Attackers can exploit the buffer overflow vulnerability remotely without authentication, causing a DoS on the SSLVPN service and potentially crashing the firewall.
Mitigation and Prevention
Protect your systems from CVE-2020-5137 with the following steps:
Immediate Steps to Take
- Apply patches provided by SonicWall promptly.
- Monitor network traffic for any suspicious activity.
- Implement strong firewall rules to restrict unauthorized access.
Long-Term Security Practices
- Regularly update and patch all software and firmware.
- Conduct security assessments and penetration testing to identify vulnerabilities.
- Educate users and IT staff on cybersecurity best practices.
Patching and Updates
- Stay informed about security updates and advisories from SonicWall.
- Apply patches and firmware updates as soon as they are released to mitigate the vulnerability.