Adobe Acrobat and Reader Double Free Remote Code Execution Vulnerability Analysis (CVE-2018-4990)
Executive & SecOps Summary
SECOPS ASSESSMENTAdobe Acrobat and Reader versions 2018.011.20038 and earlier, 2017.011.30079 and earlier, and 2015.006.30417 and earlier
Successful exploitation allows remote attackers to execute arbitrary code within the context of the current user session
Immediately apply the official Adobe security updates (APSB18-09) to patch the vulnerability
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the official Adobe APSB18-09 security updates immediately. For enterprise environments, use the following PowerShell script to audit installed versions and identify vulnerable endpoints:
# PowerShell script to detect vulnerable Adobe Acrobat/Reader versions
$UninstallKeys = Get-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*' -ErrorAction SilentlyContinue
$AdobeApps = $UninstallKeys | Where-Object { $_.DisplayName -like '*Adobe Acrobat*' -or $_.DisplayName -like '*Adobe Reader*' }
foreach ($App in $AdobeApps) {
[version]$Ver = $App.DisplayVersion
Write-Host 'Found:' $App.DisplayName 'Version:' $Ver
# Example check for 2018 Continuous track
if ($Ver -le [version]'2018.011.20038') {
Write-Warning 'Vulnerable version detected! Immediate update required.'
}
}2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, disable Acrobat JavaScript globally via the registry to mitigate the primary attack vector:
:: Disable Acrobat JavaScript via Registry to mitigate exploitation risk
reg add 'HKLM\SOFTWARE\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown' /v bDisableJavaScript /t REG_DWORD /d 1 /f
reg add 'HKLM\SOFTWARE\Policies\Adobe\Acrobat Reader\2017\FeatureLockDown' /v bDisableJavaScript /t REG_DWORD /d 1 /f3. Log Audit & IoC Verification Commands
Monitor endpoint detection and response (EDR) logs for anomalous child processes spawned by Adobe Reader. Look for instances where AcroRd32.exe or Acrobat.exe initiates command interpreters or scripting engines.
Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2018-4990) is a critical Double Free vulnerability (CWE-415) residing in Adobe Acrobat and Reader. The root cause lies in the improper management of memory pointers during the parsing of dynamic objects or stream data within PDF documents. When the application attempts to free an already deallocated memory pointer without re-initializing it to null, the heap memory manager's internal structures become corrupted.
2. Exploitation Mechanics & Attack Scenario
An attacker crafts a malicious PDF document containing specific JavaScript code or malformed stream structures designed to manipulate the heap layout. When a target user opens this document, the application triggers the initial memory deallocation, followed by a secondary deallocation of the same pointer (Double Free). This corrupts the heap's free list, allowing the attacker to overwrite critical memory pointers with shellcode addresses, hijacking the execution flow to run arbitrary commands.
3. Infrastructure & Business Impact
As a vulnerability listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, CVE-2018-4990 poses a severe threat. Successful exploitation bypasses standard endpoint defenses if the application is unpatched, leading to complete compromise of the user's workstation. This can serve as an initial entry point for lateral movement, ransomware deployment, and sensitive data exfiltration within corporate networks.
Official Vendor Advisories & References
Adobe Acrobat and Reader versions 2018.011.20038 and earlier, 2017.011.30079 and earlier, and 2015.006.30417 and earlier have a Double Free vulnerability. Successful exploitation could lead to arbitrary code execution in the context of the current user.
Frequently Asked SecOps Questions (CVE-2018-4990)
FAQQ1. How critical is CVE-2018-4990 and is it actively exploited in the wild?
CVE-2018-4990 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 35.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2018-4990?
Primary impacted vendors include adobe across acrobat, reader. Scope summary: Adobe Acrobat and Reader: Continuous 2018.011.20038 and earlier, Classic 2017.011.30079 and earlier, Classic 2015.006.30417 and earlier (Windows and macOS)
Q3. What temporary mitigations or workarounds exist for CVE-2018-4990 before patching?
[Mitigation] Immediately apply the official Adobe security updates (APSB18-09) to patch the vulnerability Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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