Cybersecurity researchers at SquareX have unveiled a sophisticated new attack vector dubbed “Syncjacking” that exploits Chrome browser extensions to compromise user devices. This technique is particularly concerning as it requires minimal permissions and operates almost invisibly while providing attackers with comprehensive control over victims’ systems.
Understanding the Syncjacking Attack Mechanism
The attack leverages legitimate-looking Chrome extensions combined with specially crafted Google Workspace domains to execute its malicious payload. Attackers begin by establishing a controlled domain within Google Workspace, creating user profiles with disabled multi-factor authentication. They then distribute seemingly beneficial Chrome extensions through the official Chrome Web Store, complete with genuine functionality to avoid suspicion.
Once installed, these malicious extensions stealthily activate a prepared Google Workspace profile in the background. Using minimal web page read/write permissions, the extension injects malicious code into Google’s support pages, triggering Chrome’s synchronization process without alerting the user.
Comprehensive Data Exposure and System Access
The successful execution of a Syncjacking attack provides attackers with unprecedented access to sensitive user data, including:
– Stored credentials and passwords
– Complete browsing history
– Bookmarks and form data
– Extension settings and preferences
Advanced Attack Capabilities Through Native Messaging
Security researchers have demonstrated how attackers can escalate their access by exploiting Chrome’s Native Messaging API, establishing direct communication channels with the operating system. This advanced stage enables:
– Remote code execution and malware deployment
– Keylogging capabilities
– Unauthorized camera and microphone access
– System-level command execution
– Extensive data exfiltration
Detection Challenges and Security Implications
The sophisticated nature of Syncjacking makes it exceptionally difficult to detect through conventional security measures. Unlike traditional social engineering attacks, this technique requires minimal user interaction and leaves virtually no visible traces of compromise, making it particularly dangerous for both individual users and organizations.
To protect against Syncjacking attacks, security experts recommend implementing a multi-layered defense strategy: carefully vetting Chrome extensions before installation, regularly auditing installed extensions, enabling multi-factor authentication across all Google accounts, and monitoring for unauthorized managed profiles in Chrome settings. Organizations should also consider implementing strict extension policies and conducting regular security awareness training focusing on browser security best practices.
