Adobe Flash Player Bytecode Verification Flaw Type Confusion Remote Code Execution Vulnerability (CVE-2017-11292)

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2017-11292) resides within the bytecode verification procedure of the ActionScript Virtual Machine (AVM2) in Adobe Flash Player. The root cause is the virtual machine's failure to properly validate untrusted values before using them in array index calculations. This lack of validation leads to a Type Confusion condition, where the application accesses memory using an incorrect object type.

2. Exploitation Mechanics & Attack Scenario

An attacker can exploit this vulnerability by hosting a specially crafted Flash (.swf) file on a malicious website or distributing it via phishing emails. When a victim visits the site or opens the file using a vulnerable version of Flash Player, the AVM2 engine processes the malformed bytecode. The resulting type confusion allows the attacker to bypass memory safety boundaries, perform out-of-bounds memory access, overwrite critical execution pointers, and execute arbitrary shellcode with the privileges of the running process.

3. Infrastructure & Business Impact

This vulnerability is actively exploited in the wild and is listed in the CISA KEV catalog. Successful exploitation grants the attacker full control over the compromised endpoint, potentially leading to lateral movement within the corporate network, deployment of ransomware, and exfiltration of sensitive business data.