CVE-2023-4069 Overview
CVE-2023-4069 is a type confusion vulnerability in the V8 JavaScript engine used by Google Chrome versions prior to 115.0.5790.170. A remote attacker can exploit this flaw by serving a crafted HTML page to a target user, triggering heap corruption inside the renderer process. Successful exploitation can lead to arbitrary code execution within the renderer sandbox and is commonly chained with sandbox-escape bugs to achieve full system compromise. Google rated the Chromium security severity as High. The vulnerability is tracked under CWE-843 (Access of Resource Using Incompatible Type).
Critical Impact
Remote attackers can trigger heap corruption in V8 through a malicious web page, enabling code execution in the renderer process.
Affected Products
- Google Chrome on Desktop prior to 115.0.5790.170
- Debian Linux distributions tracked under DSA-5467
- Fedora and Gentoo Linux Chromium packages prior to vendor patches
Discovery Timeline
- 2023-08-03 - CVE-2023-4069 published to the National Vulnerability Database
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2023-4069
Vulnerability Analysis
The flaw resides in V8, the JavaScript and WebAssembly engine that powers Chrome. Type confusion occurs when code allocates or accesses a resource using one type but later treats it as an incompatible type. In V8, this typically arises from incorrect assumptions made by the optimizing compiler (TurboFan) about the shape or map of a JavaScript object. When the engine compiles JavaScript into machine code, it speculates on object types to generate fast paths. An attacker who can manipulate object layouts at runtime can violate these speculations and force the engine to operate on memory as if it held a different type.
The result is heap corruption. The attacker gains primitives such as out-of-bounds read and write within the V8 heap, which can be escalated to arbitrary read and write across the renderer process. From there, exploit chains commonly pivot to shellcode execution by abusing JIT-compiled regions or by spraying writable executable pages.
Root Cause
The root cause is improper type checking inside V8, classified as CWE-843. V8 fails to validate that an object retains its expected type across an optimization boundary, allowing an attacker-controlled object to be reinterpreted with conflicting field layouts.
Attack Vector
Exploitation requires user interaction. A victim must visit an attacker-controlled web page or load malicious content embedded in a legitimate site, such as a compromised ad network or iframe. No authentication is required, and the attack is delivered entirely over the network. Once the malicious JavaScript executes, type confusion is triggered to corrupt V8 heap structures.
No public proof-of-concept exploit was published at the time of disclosure, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Technical details are referenced in Chromium Bug Report #1465326, which remains under restricted access per Google policy.
Detection Methods for CVE-2023-4069
Indicators of Compromise
- Chrome browser processes spawning unexpected child processes such as cmd.exe, powershell.exe, or shell interpreters after rendering a web page
- Renderer process crashes with heap corruption signatures recorded in chrome_debug.log or operating system crash reports
- Outbound network connections from Chrome renderer or helper processes to unfamiliar domains following web browsing activity
Detection Strategies
- Inventory Chrome installations across the fleet and flag any version below 115.0.5790.170 as vulnerable
- Monitor process lineage for Chrome renderer processes performing file writes or registry modifications outside the standard browser cache paths
- Inspect web traffic for JavaScript payloads exhibiting heavy use of typed arrays, ArrayBuffer manipulation, and aggressive JIT warm-up loops associated with V8 exploitation
Monitoring Recommendations
- Enable browser telemetry forwarding to a centralized log platform and alert on renderer crashes correlated with external page loads
- Track endpoint detection and response (EDR) alerts for code execution originating from chrome.exe child processes
- Correlate web proxy logs with endpoint events to identify users who visited suspicious pages prior to anomalous browser behavior
How to Mitigate CVE-2023-4069
Immediate Actions Required
- Update Google Chrome to version 115.0.5790.170 or later on all Windows, macOS, and Linux endpoints
- Apply distribution-specific Chromium patches referenced in Debian DSA-5467, Gentoo GLSA 202311-11, and the Fedora package announcement
- Restart all Chrome instances after patching to ensure the updated V8 engine is loaded into memory
Patch Information
Google released the fix in the Stable Channel update announced on August 1, 2023. Full details are documented in the Google Chrome Desktop Update advisory. Downstream Linux distributions shipped corresponding Chromium packages tracked under Gentoo GLSA 202312-07 and Gentoo GLSA 202401-34.
Workarounds
- Enforce Chrome auto-update policies through enterprise management (Group Policy, Workspace, or MDM) to prevent users from running outdated builds
- Restrict browsing to trusted sites using web proxy allowlists until patching is complete on all endpoints
- Disable JavaScript on high-risk profiles where browsing untrusted content is unavoidable, recognizing the impact to web application functionality
# Verify installed Chrome version on Linux endpoints
google-chrome --version
# Enforce minimum Chrome version via Windows Group Policy (registry)
reg add "HKLM\Software\Policies\Google\Chrome" /v TargetVersionPrefix /t REG_SZ /d "115.0.5790.170" /f
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
