Exploit for Sale: TeamViewer

Exploit for Sale: TeamViewer

For informational purposes only.

Vulnerability Type: Server-Side Request Forgery (SSRF)

The seller is offering an exploit for TeamViewer. This software is one of the most widely used remote access solutions in the world. According to the seller's description, the SSRF vulnerability allows the TeamViewer server-side component to be tricked into making a request to an internal cloud metadata endpoint, thereby obtaining temporary credentials for the cloud instance on which the infrastructure is deployed.

The author explicitly states that this is not a full Remote Code Execution (RCE), as the vulnerability itself does not immediately allow for code execution. However, by obtaining the cloud instance credentials, an attacker with sufficient time can further escalate privileges within the cloud environment, potentially leading to complete control of the instance. A similar chain of events was at the root of several high-profile incidents, including the attack on Capital One in 2019, where an SSRF vulnerability, combined with misconfigured IAM access, resulted in the leakage of data for over 100 million customers.

TeamViewer is one of the most popular remote access products in the world: according to Wikipedia, the application is installed on more than 2.5 billion devices, supports remote administration of equipment from over 130 manufacturers, and is actively used by both individual users and corporate IT departments.

Positive Technologies has conducted research on the use of TeamViewer as a legitimate channel by attackers. In a report summarizing the results of 2024, it was noted that 30% of malware used in successful attacks on Russian organizations are remote management tools, "perfectly legitimate in organizations, such as AnyDesk and TeamViewer"; the use of legitimate software to conceal activity is one of the key trends of the past two years.