Adobe Flash Player Memory Corruption Remote Code Execution Vulnerability (CVE-2015-3043)

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2015-3043) is a critical memory corruption flaw within Adobe Flash Player. Classified under Out-of-bounds Write (CWE-787), the root cause lies in the improper validation of input data boundaries when Flash Player parses specific media streams or ActionScript objects. This lack of validation allows an attacker to write data past the allocated buffer limits, corrupting adjacent heap memory structures and hijacking the application's execution flow.

2. Exploitation Mechanics & Attack Scenario

An attacker exploits this vulnerability by hosting a malicious Shockwave Flash (.swf) file on a compromised website or distributing it via spear-phishing emails. When a victim visits the site or opens the file, the vulnerable Flash Player parses the malicious payload. By carefully grooming the heap layout, the attacker bypasses modern operating system mitigations such as ASLR and DEP, leading to arbitrary shellcode execution within the context of the active user process.

3. Infrastructure & Business Impact

With a CVSS score of 9.8, this vulnerability represents a severe threat and is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog due to active zero-day exploitation in 2015. Successful exploitation grants the attacker full control over the victim's endpoint. In an enterprise environment, this can serve as an initial entry point for lateral movement, leading to sensitive data exfiltration, ransomware deployment, and complete compromise of internal network infrastructure.