The “SonicBoom” attack chain targets enterprise appliances, including SonicWall Secure Mobile Access (SMA) and Commvault backup solutions. It enables remote attackers to bypass authentication and gain full administrative control over the systems. The exploit is a multi-stage process that exploits vulnerabilities in authentication and file handling mechanisms. It uses flaws such as pre-authentication vulnerabilities, arbitrary file writes, and server-side request forgery (SSRF) to compromise systems.
The first stage of the attack involves exploiting exposed endpoints in systems like Commvault’s on-premise edition.
These endpoints are not protected by authentication, allowing attackers to interact with sensitive backend functions. In Commvault’s case, a file called “authSkipRules.xml” lists over 50 such endpoints that can be accessed without credentials. This enables unauthenticated users to initiate attacks on the system’s core functions.
The second stage of the attack utilizes SSRF and arbitrary file write vulnerabilities. By sending crafted POST requests, attackers can manipulate parameters in the system, forcing it to fetch files from attacker-controlled servers. These malicious files, typically a .jsp web shell, are downloaded and extracted into directories accessible by the web server.
This stage allows attackers to further exploit the system by using file paths and URLs inappropriately.
In the final stage, the attacker achieves remote code execution (RCE) with admin privileges. This enables full administrative control, allowing them to install malicious software, exfiltrate data, or escalate the attack within the network. Affected systems, including specific Commvault versions, have received patches, but immediate updates and audits are required to prevent breaches. Organizations are advised to update all affected appliances, monitor logs, and check for unauthorized file uploads or suspicious admin activity.
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