CVE-2020-5139 : Exploit Details and Defense Strategies
Learn about CVE-2020-5139, a critical vulnerability in SonicOS SSLVPN service that allows remote attackers to cause Denial of Service (DoS) by exploiting an Invalid pointer, leading to a firewall crash. Find out affected versions and mitigation steps.
A vulnerability in SonicOS SSLVPN service allows a remote unauthenticated attacker to cause Denial of Service (DoS) due to the release of an Invalid pointer, leading to a firewall crash. This vulnerability affects various versions of SonicOS across different generations.
Understanding CVE-2020-5139
This CVE identifies a critical vulnerability in SonicOS that can be exploited by remote attackers to disrupt services and crash firewalls.
What is CVE-2020-5139?
The vulnerability in SonicOS SSLVPN service enables remote unauthenticated attackers to trigger a Denial of Service (DoS) attack by exploiting an Invalid pointer, resulting in a firewall crash.
The Impact of CVE-2020-5139
The vulnerability poses a significant risk as it allows attackers to disrupt services and potentially compromise network security by causing a firewall crash.
Technical Details of CVE-2020-5139
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability in SonicOS SSLVPN service arises from the release of an Invalid pointer, which can be exploited by remote unauthenticated attackers to cause a Denial of Service (DoS) attack.
Affected Systems and Versions
- 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
The vulnerability can be exploited remotely by sending specially crafted requests to the SonicOS SSLVPN service, causing the release of an Invalid pointer and subsequent firewall crash.
Mitigation and Prevention
Protecting systems from CVE-2020-5139 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor-supplied patches or updates to mitigate the vulnerability.
- Monitor network traffic for any suspicious activity targeting the SSLVPN service.
Long-Term Security Practices
- Regularly update and patch all software and firmware to address security vulnerabilities.
- Implement network segmentation and access controls to limit the impact of potential attacks.
Patching and Updates
- SonicWall has released patches to address the vulnerability. Ensure all affected systems are updated with the latest security fixes.