Google Chrome V8 Engine Array Deserialization Out-of-Bounds Write Vulnerability (CVE-2018-17480) Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTGoogle Chrome prior to version 71.0.3578.80
Remote attackers can execute arbitrary code inside the browser sandbox by enticing a user to visit a specially crafted HTML page.
Immediately update Google Chrome to the latest stable version (71.0.3578.80 or higher) across all enterprise endpoints.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
To mitigate this vulnerability, upgrade Google Chrome to the latest stable version using the package manager on Linux systems.
# Upgrade Google Chrome on Debian/Ubuntu-based systems
sudo apt-get update && sudo apt-get --only-upgrade install google-chrome-stable -y
# Upgrade Google Chrome on RedHat/CentOS-based systems
sudo yum update google-chrome-stable -y2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, enforce strict browser policies and ensure that the Chrome sandbox is strictly enabled via system registry or group policies.
# Enforce Chrome Sandbox via Windows Registry
New-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Google\Chrome' -Name 'SandboxState' -Value 1 -PropertyType DWord -Force3. Log Audit & IoC Verification Commands
Use the following script to audit the installed Google Chrome version on endpoints to identify vulnerable installations.
# Check Chrome version and flag if vulnerable
CURRENT_VER=$(google-chrome --version | awk '{print $3}')
SAFE_VER='71.0.3578.80'
if [ '$(printf '%s\
' '$SAFE_VER' '$CURRENT_VER' | sort -V | head -n1)' != '$SAFE_VER' ]; then
echo '[ALERT] Vulnerable Chrome version detected: '$CURRENT_VER'. Upgrade required.'
else
echo '[INFO] Chrome version '$CURRENT_VER' is patched.'
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2018-17480) exists in the V8 JavaScript engine of Google Chrome during the array deserialization process. The root cause lies in the execution of user-supplied JavaScript code during deserialization, which can trigger side effects that alter the memory layout or resize the array dynamically. Consequently, the engine performs an Out-of-Bounds (OOB) write (CWE-787) by writing data beyond the allocated buffer boundaries.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by hosting a malicious HTML page containing crafted JavaScript code. When a victim visits the page, the V8 engine attempts to deserialize array data, triggering a callback to the attacker's custom JavaScript code. This callback manipulates the array's structure, causing a mismatch in heap memory allocation. When the engine subsequently writes to the array, it overwrites adjacent memory, allowing the attacker to hijack control flow and execute arbitrary code within the sandbox.
3. Infrastructure & Business Impact
As this vulnerability is listed in the CISA KEV catalog, it has been actively exploited in the wild. Although the execution is initially restricted within the Chrome sandbox, attackers often chain this with local privilege escalation (LPE) vulnerabilities to escape the sandbox, compromise the host operating system, and gain full control over the endpoint, leading to potential data exfiltration and lateral movement.
Official Vendor Advisories & References
Execution of user supplied Javascript during array deserialization leading to an out of bounds write in V8 in Google Chrome prior to 71.0.3578.80 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page.
Frequently Asked SecOps Questions (CVE-2018-17480)
FAQQ1. How critical is CVE-2018-17480 and is it actively exploited in the wild?
CVE-2018-17480 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 35.6%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2018-17480?
Primary impacted vendors include google across chrome. Scope summary: Google Chrome prior to 71.0.3578.80 (All operating systems: Windows, macOS, Linux)
Q3. What temporary mitigations or workarounds exist for CVE-2018-17480 before patching?
[Mitigation] Immediately update Google Chrome to the latest stable version (71.0.3578.80 or higher) across all enterprise endpoints. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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