CVE-2012-3555 in Web Browser
Summary
by MITRE
Opera before 11.65 does not ensure that keyboard sequences are associated with a visible window, which makes it easier for user-assisted remote attackers to conduct cross-site scripting (XSS) attacks or execute arbitrary code via a crafted web site, related to a "hidden keyboard navigation" issue.
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Analysis
by VulDB Data Team • 12/03/2021
The vulnerability described in CVE-2012-3555 represents a critical security flaw in Opera web browsers prior to version 11.65 that stems from improper handling of keyboard input sequences within the browser's user interface. This issue specifically relates to the browser's failure to validate that keyboard navigation events are properly associated with visible windows, creating a dangerous condition that allows malicious actors to exploit the browser's input handling mechanisms.
The technical nature of this vulnerability can be categorized under CWE-200, which deals with information exposure, and more specifically relates to CWE-79, cross-site scripting, as well as CWE-94, execution of arbitrary code. The flaw occurs when Opera's browser engine processes keyboard navigation events without verifying that these events originate from a visible, active window context. This creates a scenario where attackers can craft malicious websites that manipulate keyboard input handling to bypass normal security boundaries that typically protect against such attacks.
From an operational perspective, this vulnerability enables attackers to conduct sophisticated cross-site scripting attacks by exploiting the hidden keyboard navigation functionality. The flaw allows remote attackers to inject malicious code that can execute arbitrary commands on the victim's system through carefully crafted web content. This represents a significant escalation from typical XSS vulnerabilities because it leverages the browser's own keyboard handling mechanisms against itself, making detection and prevention more challenging.
The attack vector requires user interaction, meaning that victims must navigate to a malicious website for exploitation to occur, but once triggered, the vulnerability can lead to complete browser compromise. The hidden keyboard navigation aspect means that attackers can potentially bypass standard security measures that would normally prevent such attacks, as the input sequences are processed in a manner that appears legitimate to the browser's security model.
Security professionals should note that this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to privilege escalation and code injection. The flaw essentially provides an attack surface that allows adversaries to manipulate the browser's user interface handling in ways that should normally be restricted, creating opportunities for more sophisticated attacks that could lead to full system compromise.
Mitigation strategies for this vulnerability include immediate upgrading to Opera version 11.65 or later, which contains the necessary patches to address the hidden keyboard navigation issue. Organizations should also implement comprehensive browser security policies that include regular updates and monitoring for vulnerable browser versions. Additional protective measures might include implementing content security policies, using web application firewalls, and deploying browser security extensions that can help detect and prevent exploitation attempts. Network administrators should also consider implementing security awareness training to help users recognize potentially malicious websites that might attempt to exploit such vulnerabilities.