CVE-2018-15981 in Flash Player
Summary
by MITRE
Flash Player versions 31.0.0.148 and earlier have a type confusion vulnerability. Successful exploitation could lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 04/14/2020
The vulnerability identified as CVE-2018-15981 represents a critical type confusion flaw within Adobe Flash Player versions 31.0.0.148 and earlier. This issue manifests as a fundamental error in how the software handles data types during runtime operations, creating opportunities for malicious actors to manipulate memory structures and execute unauthorized code. Type confusion vulnerabilities occur when a program incorrectly handles data type assumptions, leading to situations where one data type is treated as another, potentially causing unpredictable behavior and security breaches.
The technical nature of this vulnerability stems from improper type validation within Flash Player's memory management system. When processing certain multimedia content or user inputs, the application fails to properly verify the expected data types of variables and objects, allowing attackers to craft malicious payloads that exploit these type inconsistencies. This flaw specifically affects the ActionScript virtual machine's handling of object references and memory allocation patterns, creating conditions where attacker-controlled data can be interpreted as executable code rather than simple data structures. The vulnerability falls under the CWE-466 category of "Use of Potentially Dangerous Function" and represents a classic example of memory corruption issues that enable privilege escalation and code execution attacks.
The operational impact of CVE-2018-15981 extends far beyond simple exploitation scenarios, as it provides attackers with a pathway to achieve arbitrary code execution on vulnerable systems. This capability enables threat actors to bypass traditional security controls, install persistent backdoors, and establish footholds within target networks without requiring user interaction or elevated privileges. The vulnerability's exploitation potential aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: JavaScript" and T1203 for "Exploitation for Client Execution," demonstrating how attackers can leverage this flaw to deploy malware and maintain long-term access to compromised systems. Organizations running vulnerable Flash Player installations face significant risk of data breaches, system compromise, and potential lateral movement within their network infrastructure.
Mitigation strategies for CVE-2018-15981 require immediate action to address the root cause through official security patches provided by Adobe. The recommended approach involves deploying the latest Flash Player updates that contain fixes for the type confusion vulnerability, along with implementing network-based controls such as firewall rules that block Flash content delivery and disable Flash plugin execution. Additional defensive measures include regular security assessments of deployed Flash content, implementation of web application firewalls to filter malicious payloads, and comprehensive monitoring for suspicious network activity that may indicate exploitation attempts. Organizations should also consider implementing application whitelisting policies to prevent execution of unauthorized Flash content and establish incident response procedures specifically designed to handle exploitation of memory corruption vulnerabilities. The remediation process must include thorough testing of patched systems to ensure compatibility while maintaining security posture against this and similar threats.