External risk intelligence

SonicWall SSLVPN SMA100 Credential Access Vulnerability.

CVE advisoryKnown Exploit

CVE-2021-20016

A SQL injection flaw in SonicWall SSLVPN SMA100 products allows attackers to access sensitive data like usernames and passwords. This impacts organizations by potentially exposing credentials and session information, posing a business risk.

5Halo Surface Signal

SQL Injection

Sonicwall Sma 100 Firmware

10.0.0.0 to before 10.2.0.5-d-29sv

External exposure likelihood

Halo Surface Signal score for CVE-2021-20016

The product is a SonicWall SSLVPN appliance, which is specifically designed to be deployed as an internet-facing edge gateway to provide remote network access. Such devices are intentionally exposed to the public internet to facilitate connectivity for remote users and are frequently encountered as public-facing services.

Horizon Alert

Summary of the vulnerability and why it matters

The SonicWall SSLVPN SMA100 product contains a vulnerability that permits unauthorized remote access. This flaw enables an attacker to execute SQL queries, potentially compromising sensitive information such as usernames, passwords, and session details. The impact could affect the confidentiality and integrity of user credentials and session data within the affected organizations.

  • Vulnerable SonicWall SSLVPN SMA100
  • SQL injection flaw
  • Compromise of credentials and session data

Attack Path

How an attacker could exploit the issue

A SQL injection vulnerability in the SonicWall SSLVPN SMA100 product allows an unauthenticated remote attacker to execute SQL queries. This can lead to the exposure of sensitive information, including usernames and passwords, as well as other session-related data. The vulnerability specifically impacts SMA100 devices running build version 10.x.

  • Exposure: Internet-facing SSLVPN appliance.
  • Attacker access: Remote, unauthenticated.
  • Trigger and result: SQL query to access sensitive data.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability allows an unauthenticated attacker to inject SQL queries, potentially accessing sensitive information such as usernames and passwords. The impact includes unauthorized access to user credentials and session data, posing a significant business risk. Organizations using the affected product should consider this a high-priority issue.

  • Likely attacker skill level: Low
  • Required access or conditions: Network access
  • Business risk or urgency: High

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

A SQL-injection vulnerability in SonicWall SSLVPN SMA100 products can allow an attacker to access sensitive information, including usernames and passwords. The vulnerability impacts specific build versions of the SMA100. This poses a significant business risk by potentially compromising user credentials and session data, which could lead to further unauthorized access.

  • Identify exposed SonicWall SMA100 assets.
  • Restrict network access to these assets.
  • Apply vendor updates, verify, and monitor.

Frequently asked questions

What is SonicWall SSLVPN SMA100 and what is it used for?

SonicWall SSLVPN SMA100 is a product that provides secure remote access to an organization's network through a virtual private network (VPN) using SSL/TLS encryption. It allows authorized users to connect to internal resources from external locations, as if they were physically present on the network.

What is CVE-2021-20016 and what kind of weakness does it represent?

CVE-2021-20016 is a SQL injection vulnerability in SonicWall SSLVPN SMA100. SQL injection is a weakness where an attacker can interfere with the queries an application makes to its database. This can allow them to view, modify, or otherwise manipulate data they normally wouldn't be able to access.

How can an attacker exploit this CVE-2021-20016 vulnerability?

An attacker can exploit this vulnerability by sending specially crafted SQL queries. This does not require any authentication or special access. The vulnerability is triggered when the system processes these malicious queries, potentially leading to unauthorized data access.

Who should care about the SonicWall SMA100 vulnerability, considering its exposure?

Organizations using SonicWall SSLVPN SMA100, especially those with internet-facing configurations, should care. The Halo Surface Signal indicates this product is very likely internet-facing, meaning attackers can potentially reach it from outside the network perimeter to exploit the vulnerability.

What is the first step for organizations running this technology?

The first practical step is to identify all SonicWall SMA100 assets within your environment that might be exposed. Following that, restricting network access to these assets is advisable while investigating and planning for vendor-provided updates.

References