CVE-2021-20048 : Security Advisory and Response
Learn about CVE-2021-20048 impacting SonicWall SonicOS firmware, allowing a remote attacker to trigger Denial of Service and execute code. Find details and mitigation steps here.
A Stack-based buffer overflow vulnerability in SonicOS firmware versions allows a remote authenticated attacker to trigger a DoS and potentially execute code on the firewall.
Understanding CVE-2021-20048
This CVE affects SonicOS Gen 5, Gen 6, and Gen 7 firmware versions.
What is CVE-2021-20048?
A Stack-based buffer overflow in the SonicOS SessionID HTTP response header can lead to DoS and code execution on the firewall.
The Impact of CVE-2021-20048
The vulnerability poses a risk of Denial of Service and potential code execution by a remote authenticated attacker.
Technical Details of CVE-2021-20048
The vulnerability is categorized under CWE-121 - Stack-based Buffer Overflow.
Vulnerability Description
A Stack-based buffer overflow in the SonicOS SessionID HTTP response header enables a remote authenticated attacker to disrupt services and execute arbitrary code on the firewall.
Affected Systems and Versions
SonicOS firmware versions 5.9.1.13 and earlier up to 7.0.1-R146 are impacted by this vulnerability.
Exploitation Mechanism
By sending specially crafted requests to the affected SonicOS device, an attacker can exploit this vulnerability to cause a denial of service condition and possibly execute arbitrary code.
Mitigation and Prevention
To safeguard your systems against CVE-2021-20048, follow these security measures:
Immediate Steps to Take
Immediately apply security patches provided by SonicWall to mitigate the vulnerability.
Long-Term Security Practices
Regularly update and patch SonicOS firmware to protect against security vulnerabilities.
Patching and Updates
Stay updated with security advisories from SonicWall and apply patches promptly to prevent exploitation of vulnerabilities.