In the ever-evolving landscape of cybersecurity, researchers recently uncovered a significant security flaw in the Opera web browser, impacting both Microsoft Windows and Apple macOS users.
Introduction:
This flaw, named MyFlaw by the Guardio Labs research team, exploits a feature called MyFlaw, enabling threat actors to execute any file on the underlying operating system. This blog post delves into the details of MyFlaw, its implications, and the swift response from Opera to address the vulnerability.
The MyFlaw Exploitation:
The vulnerability arises from the My Flow feature, designed to sync messages and files seamlessly between mobile and desktop devices. Guardio Labs revealed that a controlled browser extension, circumventing the browser’s sandbox and the entire browser process, facilitates this exploit. My Flow, with its chat-like interface for exchanging notes and files, becomes a conduit for executing files outside the browser’s security boundaries.
Technical Details:
MyFlaw comes pre-installed in the Opera browser, operating through the “Opera Touch Background” internal browser extension. This extension communicates with its mobile counterpart and possesses its manifest file, specifying permissions and behavior. Notably, the extension exposes the messaging API to any page matching specific URL patterns controlled by Opera. Guardio Labs uncovered a forgotten version of the My Flow landing page, lacking essential security measures and containing a script tag vulnerable to code injection.
The Attack Chain:
The attack chain involves creating a specially crafted extension masquerading as a mobile device. This extension pairs with the victim’s computer, transmitting an encrypted malicious payload via a modified JavaScript file. The user is prompted to click anywhere on the screen, unwittingly executing the malicious code. This method highlights the sophistication of browser-based attacks and the diverse vectors exploited by threat actors.
Browser Security Challenges:
Despite operating in sandboxed environments, browser extensions can be potent tools for hackers, breaching security boundaries and stealing sensitive information. Guardio Labs emphasizes the need for internal design changes at Opera and improvements in Chromium’s infrastructure. Recommendations include disabling third-party extension permissions on dedicated production domains, similar to Chrome’s web store safeguards.
Opera's Response:
Upon responsible disclosure on November 17, 2023, Opera promptly addressed the MyFlaw vulnerability through updates released on November 22, 2023. The company acknowledged the need for structural changes and affirmed its commitment to user safety. Opera removed the cause of the issues and assured users that similar problems would be prevented in the future. The collaboration with Guardio Labs showcased the importance of security experts and researchers working together to enhance product security.
Conclusion:
The MyFlaw vulnerability serves as a reminder of the persistent challenges in securing web browsers. Opera’s swift response and collaboration with security experts underscore the industry’s commitment to mitigating risks and ensuring a safe online experience for users. As cyber threats continue to evolve, ongoing vigilance, proactive measures, and collaboration remain crucial in safeguarding digital ecosystems.
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