CVE-2016-1586 in Oxide
Summary
by MITRE
A malicious webview could install long-lived unload handlers that re-use an incognito BrowserContext that is queued for destruction in versions of Oxide before 1.18.3.
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Analysis
by VulDB Data Team • 09/06/2023
The vulnerability described in CVE-2016-1586 represents a critical security flaw within the Oxide rendering engine used in various browser implementations. This issue specifically affects versions prior to 1.18.3 and stems from improper handling of browser context lifecycle management. The vulnerability occurs when a malicious webview attempts to install long-lived unload handlers that can reuse an incognito BrowserContext which is already scheduled for destruction, creating a potential attack vector that could persist beyond normal session boundaries.
The technical flaw manifests through the improper management of BrowserContext objects within the Oxide engine's memory lifecycle. When a BrowserContext is marked for destruction, typically during session cleanup or navigation away from an incognito session, the system should ensure that all associated handlers and references are properly terminated. However, in vulnerable versions, the engine allows malicious webviews to register unload handlers that can persist and execute even after the incognito context has been queued for destruction. This creates a scenario where attackers can maintain access to sensitive session data or execute code within a context that should have been securely terminated.
The operational impact of this vulnerability extends beyond simple session persistence, as it enables attackers to potentially maintain long-term access to incognito browsing sessions. Incognito mode is specifically designed to provide users with a secure browsing environment where session data is not persisted beyond the current session. When this security boundary is compromised, attackers can exploit the reused BrowserContext to access cached credentials, session tokens, or other sensitive information that should have been cleared upon session termination. This vulnerability particularly affects user privacy and security assurances provided by incognito browsing features.
The exploitation of this vulnerability aligns with several attack patterns documented in the attack tactics and techniques framework, particularly those involving persistent access and session hijacking. From a cybersecurity perspective, this represents a form of privilege escalation where malicious code gains extended access to browser resources beyond normal operational boundaries. The vulnerability demonstrates poor resource management practices and inadequate context lifecycle enforcement, which are commonly addressed through proper memory management and secure coding practices.
Mitigation strategies for CVE-2016-1586 primarily focus on updating to versions 1.18.3 and later where the underlying BrowserContext lifecycle management has been properly addressed. Organizations should implement comprehensive patch management procedures to ensure all affected systems receive timely updates. Additionally, security monitoring should include detection of anomalous webview behavior, particularly around unload handler registration patterns that might indicate attempts to exploit this vulnerability. The fix typically involves implementing stricter enforcement of BrowserContext destruction timelines and preventing reuse of contexts that are in the process of being terminated, aligning with secure coding principles that prevent resource leaks and improper state management.
This vulnerability type relates to several CWE categories including CWE-691, which addresses insufficient control flow management, and CWE-692, which covers insufficient enforcement of data flow protection. The issue also demonstrates characteristics consistent with improper resource management and memory safety violations that are commonly addressed through defensive programming practices and proper lifecycle management of system resources. Organizations should review their browser engine implementations and ensure proper context management protocols are in place to prevent similar vulnerabilities from emerging in their systems.