Critical SQL Injection Vulnerability in SonicWall SMA 100 Series: CVE-2021-20016 Report

Executive Summary

CVE-2021-20016 is a critical SQL Injection vulnerability identified in SonicWall's Secure Mobile Access (SMA) 100 series products. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary SQL queries, potentially leading to unauthorized access to sensitive information such as usernames, passwords, and session-related data. The vulnerability has a CVSS score of 9.8, indicating its critical nature. Immediate action is required to mitigate the risks associated with this vulnerability.

Technical Information

CVE-2021-20016 is a SQL Injection vulnerability that affects the SonicWall SMA 100 series products. The vulnerability exists due to improper neutralization of special elements used in an SQL command, commonly referred to as SQL Injection (CWE-89). This flaw allows a remote, unauthenticated attacker to perform SQL queries to access sensitive information stored within the affected devices.

The vulnerability is present in firmware versions from 10.0.0.0 up to (excluding) 10.2.0.5-d-29sv. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, which translates to a critical severity level. The attack vector is network-based, with low attack complexity, no privileges required, and no user interaction needed. The impact on confidentiality, integrity, and availability is high.

The exploitation of this vulnerability involves sending crafted SQL queries through the vulnerable endpoints of the SonicWall SMA 100 series devices. These queries can be used to retrieve sensitive information such as usernames, passwords, and session-related data, which can then be leveraged for further attacks.

Exploitation in the Wild

This vulnerability has been actively exploited in the wild. Attackers have leveraged this SQL injection flaw to gain unauthorized access to sensitive data stored within the affected SonicWall devices. The exploitation typically involves sending crafted SQL queries through the vulnerable endpoints of the SonicWall SMA 100 series devices. Indicators of Compromise (IOCs) include unusual login attempts or access patterns on the SonicWall SMA 100 series devices, detection of SQL injection payloads in network traffic logs, and unauthorized access to sensitive data such as usernames and passwords.

APT Groups using this vulnerability

While specific APT groups exploiting CVE-2021-20016 have not been publicly identified, the nature of the vulnerability makes it a valuable target for state-sponsored actors and cybercriminal groups seeking to gain unauthorized access to sensitive information. The sectors and countries targeted by these groups often include critical infrastructure, government agencies, and large enterprises across various regions.

Affected Product Versions

The affected product versions include SonicWall SMA 100 series firmware versions from 10.0.0.0 up to (excluding) 10.2.0.5-d-29sv. It is crucial for organizations using these versions to apply the necessary patches to mitigate the risks associated with this vulnerability.

Workaround and Mitigation

To mitigate the risks associated with CVE-2021-20016, it is essential to apply the latest firmware updates provided by SonicWall. The vendor has released patches to address this vulnerability, and it is crucial to follow the guidance provided in the SonicWall PSIRT Advisory. Additionally, organizations should continuously monitor for Indicators of Compromise (IOCs) and adhere to best practices for securing their network infrastructure.

References

For further information and detailed analysis, please refer to the following sources:

1. NVD (National Vulnerability Database): CVE-2021-20016 Detail
2. SonicWall Security Advisory: SonicWall PSIRT Advisory
3. Tenable Blog: CVE-2021-20016 Zero-Day Vulnerability in SonicWall Secure Mobile Access
4. Rapid7: SonicWall SMA100: CVE-2021-20016
5. CISA Advisory: 2021 Top Routinely Exploited Vulnerabilities

Rescana is here for you

At Rescana, we understand the critical importance of safeguarding your organization against emerging threats. Our Continuous Threat and Exposure Management (CTEM) platform is designed to help you identify, assess, and mitigate vulnerabilities in real-time. We are committed to providing you with the tools and insights needed to protect your valuable assets. If you have any questions about this report or any other issue, please do not hesitate to contact us at ops@rescana.com.