CVE-2020-9987 in Safari
Summary
by MITRE • 12/09/2020
An inconsistent user interface issue was addressed with improved state management. This issue is fixed in Safari 14.0. Visiting a malicious website may lead to address bar spoofing.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 12/15/2020
The vulnerability described in CVE-2020-9987 represents a critical user interface inconsistency that undermines the security posture of Safari browsers. This issue manifests as an address bar spoofing vulnerability that allows malicious actors to deceive users into believing they are visiting legitimate websites when in fact they are interacting with fraudulent domains. The flaw specifically affects Safari versions prior to 14.0, where inconsistent state management during page transitions creates opportunities for attackers to manipulate the browser's visual representation of the current URL. The vulnerability falls under the category of user interface deception attacks that exploit the trust users place in visual indicators such as the address bar, which serves as a primary security mechanism for verifying website authenticity.
The technical root cause of this vulnerability lies in the browser's state management system which fails to properly synchronize the visual representation of the current browsing context with the actual underlying web page content. When users navigate between pages or encounter certain dynamic content scenarios, the browser's interface does not accurately reflect the true domain of the currently loaded page. This inconsistency creates a window of opportunity where attackers can manipulate the address bar display to show a trusted domain while actually loading content from a malicious source. The vulnerability demonstrates poor separation of concerns between the browser's rendering engine and its user interface components, resulting in a state management flaw that violates fundamental security principles.
The operational impact of this vulnerability extends beyond simple phishing attacks to potentially enable more sophisticated social engineering campaigns. Users who rely on the address bar as a security indicator may unknowingly grant sensitive information to attackers who have successfully spoofed the browser's visual representation. This issue particularly affects web browsing sessions where users are performing sensitive activities such as online banking, email access, or corporate network authentication. The vulnerability can be exploited through malicious websites that leverage JavaScript and CSS manipulation techniques to alter the address bar display while maintaining the underlying malicious content. Security researchers have noted that this type of attack can bypass traditional security measures since the visual deception occurs at the interface level rather than through network-level attacks.
Mitigation strategies for CVE-2020-9987 primarily focus on upgrading to Safari 14.0 or later versions where the issue has been resolved through improved state management protocols. Browser vendors have implemented enhanced synchronization mechanisms between the rendering engine and user interface components to ensure that address bar displays accurately reflect the current page's domain information. Organizations should also consider implementing additional security layers such as URL filtering solutions and user education programs to reduce the risk of successful exploitation. The vulnerability aligns with attack patterns documented in the attack tree framework where user interface deception serves as a primary attack vector for social engineering campaigns. This issue is classified under CWE-602 as a client-side attack vector where the user interface is manipulated to deceive users into performing unintended actions, and it relates to ATT&CK technique T1566 for social engineering attacks that exploit user trust in visual indicators.