Adobe Flash Player Heap-Based Buffer Overflow Remote Code Execution Vulnerability (CVE-2015-3113) Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTAdobe Flash Player before 13.0.0.296, and 14.x through 18.x before 18.0.0.194 on Windows and OS X, and before 11.2.202.468 on Linux
Remote attackers can execute arbitrary code and gain full system control via specially crafted malicious Flash content (.swf) without user interaction
Since Adobe Flash Player has reached End-of-Life (EOL), the recommended mitigation is to completely uninstall Flash Player and disable browser plugins across all systems
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Because Adobe Flash Player is EOL, no further security patches will be released. The only secure remediation is complete removal. Use the following PowerShell commands to remove Flash Player remnants from Windows systems:
# Force removal of Flash Player directories and active controls
$FlashPaths = @(
'C:\Windows\System32\Macromed\Flash',
'C:\Windows\SysWOW64\Macromed\Flash'
)
foreach ($path in $FlashPaths) {
if (Test-Path $path) {
Remove-Item -Path $path -Recurse -Force -ErrorAction SilentlyContinue
}
}
Write-Output 'Flash Player directories successfully purged.'2. Temporary Workaround & Hardening Configuration
If immediate uninstallation is not feasible due to legacy dependencies, enforce browser policies to block Flash execution entirely using registry modifications:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Internet Explorer\ActiveX Compatibility\{D27CDB6E-AE6D-11cf-96B8-444553540000}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome]
"DefaultPluginsSetting"=dword:000000023. Log Audit & IoC Verification Commands
Use the following bash script to audit Linux endpoints for legacy, vulnerable Flash Player shared libraries:
#!/bin/bash
echo '[*] Auditing system for vulnerable Flash Player binaries...'
# Search for Flash shared object files
found_libs=$(find /usr/lib/ /usr/lib64/ -name 'libflashplayer.so' 2>/dev/null)
if [ -n "$found_libs" ]; then
echo '[!] WARNING: Vulnerable Flash Player library found:'
echo "$found_libs"
else
echo '[+] No Flash Player libraries detected.'
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2015-3113) is a critical heap-based buffer overflow (CWE-122, CWE-787) residing in Adobe Flash Player's memory management component. The root cause lies in the improper validation of input data sizes when parsing external media streams or specific data structures. When Flash Player processes a malformed stream, it writes data beyond the allocated boundary of the heap buffer, leading to memory corruption.
2. Exploitation Mechanics & Attack Scenario
In active wild exploits, attackers delivered malicious Flash (.swf) files embedded in phishing emails or hosted on compromised websites. By leveraging ActionScript, attackers perform precise heap layout manipulation (heap spraying) to align memory blocks. Once the heap buffer overflow is triggered, critical pointers or virtual function tables (vtables) are overwritten, redirecting the execution flow to attacker-controlled shellcode, leading to complete system compromise.
3. Infrastructure & Business Impact
With a CVSS score of 9.8 and inclusion in CISA's KEV catalog, this vulnerability represents a severe threat vector. Successful exploitation allows unauthenticated remote attackers to execute arbitrary code with the privileges of the active user. This can lead to initial access into corporate networks, subsequent lateral movement, data exfiltration, and deployment of ransomware, causing catastrophic business disruption.
Official Vendor Advisories & References
Heap-based buffer overflow in Adobe Flash Player before 13.0.0.296 and 14.x through 18.x before 18.0.0.194 on Windows and OS X and before 11.2.202.468 on Linux allows remote attackers to execute arbitrary code via unspecified vectors, as exploited in the wild in June 2015.
Frequently Asked SecOps Questions (CVE-2015-3113)
FAQQ1. How critical is CVE-2015-3113 and is it actively exploited in the wild?
CVE-2015-3113 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 99.8%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2015-3113?
Primary impacted vendors include adobe across flash_player. Scope summary: Windows & OS X: Adobe Flash Player before 13.0.0.296, 14.x to 18.x before 18.0.0.194 / Linux: before 11.2.202.468
Q3. What temporary mitigations or workarounds exist for CVE-2015-3113 before patching?
[Mitigation] Since Adobe Flash Player has reached End-of-Life (EOL), the recommended mitigation is to completely uninstall Flash Player and disable browser plugins across all systems Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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