CVE-2017-2995 in Flash Player
Summary
by MITRE
Adobe Flash Player versions 24.0.0.194 and earlier have an exploitable type confusion vulnerability related to the MessageChannel class. Successful exploitation could lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 08/14/2020
Adobe Flash Player contains a critical type confusion vulnerability within its MessageChannel class implementation that affects versions 24.0.0.194 and earlier. This vulnerability stems from improper handling of object types during runtime execution, specifically when the player processes messages through the MessageChannel class. The flaw allows attackers to manipulate object references and force the system to treat data as different types than intended, creating a type confusion scenario that can be exploited for code execution.
The technical nature of this vulnerability aligns with CWE-476 which describes NULL pointer dereference conditions, though more specifically it manifests as a type confusion issue where the MessageChannel class fails to properly validate object types during message processing operations. This type confusion occurs when the Flash Player's runtime environment incorrectly handles memory references, allowing attackers to craft malicious input that causes the system to execute unintended code paths. The vulnerability is particularly dangerous because it can be triggered through web-based attacks, making it accessible to remote threat actors without requiring local system access.
Successful exploitation of this vulnerability can result in arbitrary code execution within the context of the Flash Player application, potentially allowing attackers to gain full control over the affected system. The impact extends beyond simple code execution as it can lead to complete system compromise, data exfiltration, and persistent backdoor installation. Attackers can leverage this vulnerability through malicious web pages or documents that trigger the vulnerable MessageChannel functionality, making it a prime target for drive-by download attacks and social engineering campaigns. The vulnerability's remote exploitability makes it particularly concerning for enterprise environments where Flash Player remains in use despite its deprecated status.
Organizations should immediately disable Flash Player across all systems and remove it from browsers and applications to prevent exploitation. The recommended mitigation strategy involves implementing browser security policies that block Flash content entirely, as well as deploying network-based intrusion detection systems to monitor for suspicious Flash-related traffic patterns. Security teams should also conduct comprehensive vulnerability assessments to identify any remaining Flash Player installations within their infrastructure. Additionally, implementing web application firewalls and content security policies can provide additional layers of protection against exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1203 - Exploitation for Client Execution, highlighting the need for comprehensive endpoint protection measures and regular security updates to prevent successful exploitation attempts.