CVE-2017-7326 in Yandex
Summary
by MITRE
Race condition issue in Yandex Browser for Android before 17.4.0.16 allowed a remote attacker to potentially exploit memory corruption via a crafted HTML page
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Analysis
by VulDB Data Team • 12/25/2019
The vulnerability identified as CVE-2017-7326 represents a critical race condition flaw within the Yandex Browser for Android platform that existed prior to version 17.4.0.16. This type of vulnerability falls under the broader category of concurrency issues that can lead to unpredictable behavior and potential security exploits. The race condition manifests in the browser's handling of memory management during the processing of web content, creating a window of opportunity for malicious actors to manipulate the system's memory state. The flaw specifically affects the Android implementation of the Yandex Browser, which is a Chromium-based browser that leverages the underlying Android WebView component for rendering web pages.
The technical exploitation of this vulnerability occurs when a remote attacker crafts a malicious HTML page that triggers the race condition during the browser's rendering process. This particular flaw allows for memory corruption that can be leveraged to execute arbitrary code on the affected device. The race condition typically arises when multiple threads or processes attempt to access shared memory resources simultaneously without proper synchronization mechanisms. In the context of web browser security, such conditions can lead to heap corruption, stack overflow, or other memory-related vulnerabilities that provide attackers with opportunities to gain unauthorized access or execute malicious payloads. The vulnerability is classified under CWE-362 which specifically addresses Race Conditions in software systems and aligns with the broader category of concurrency flaws that can compromise system integrity.
The operational impact of CVE-2017-7326 extends beyond simple browser exploitation as it represents a potential pathway for more sophisticated attacks targeting mobile users. Mobile browsers serve as gateways to numerous applications and services, making them attractive targets for attackers seeking to establish persistent access to user devices. The vulnerability could potentially enable attackers to bypass security restrictions, access sensitive user data, or escalate privileges within the device's operating system. This type of remote code execution vulnerability is particularly concerning in mobile environments where users may have limited control over their device security configurations and where the attack surface includes not only the browser itself but also the underlying operating system and installed applications. The exploitability of this flaw means that users could be compromised simply by visiting a malicious website, making it a significant concern for mobile security.
Mitigation strategies for CVE-2017-7326 primarily involve updating to Yandex Browser version 17.4.0.16 or later, which contains the necessary patches to address the race condition. Organizations and individuals should implement proactive security measures including regular software updates, web application firewalls, and content filtering solutions to protect against exploitation attempts. Network administrators should consider implementing browser hardening policies that restrict access to untrusted websites and monitor for suspicious web traffic patterns. The vulnerability also highlights the importance of proper input validation and memory management in web browser implementations, particularly in mobile environments where resources are more constrained. Security professionals should also consider implementing threat hunting activities focused on identifying potential exploitation attempts and monitor for indicators of compromise related to mobile browser attacks. This vulnerability serves as a reminder of the critical need for comprehensive security testing in mobile browser implementations and the importance of addressing concurrency issues in multi-threaded applications.