CVE-2023-1530 Overview
CVE-2023-1530 is a use-after-free vulnerability in the PDF component of Google Chrome prior to version 111.0.5563.110. This memory corruption flaw allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. The vulnerability occurs when the browser's PDF rendering engine improperly manages memory allocation and deallocation, creating an opportunity for attackers to execute arbitrary code or cause system instability.
Critical Impact
Remote attackers can achieve arbitrary code execution through heap corruption by enticing users to visit maliciously crafted web pages containing embedded PDF content.
Affected Products
- Google Chrome prior to version 111.0.5563.110
- Fedora 36, 37, and 38 (via bundled Chromium packages)
Discovery Timeline
- 2023-03-21 - CVE-2023-1530 published to NVD
- 2025-05-05 - Last updated in NVD database
Technical Details for CVE-2023-1530
Vulnerability Analysis
This use-after-free vulnerability (CWE-416) exists in Google Chrome's PDF rendering component. The flaw allows attackers to craft malicious HTML pages containing specially formatted PDF content that triggers improper memory handling. When a user visits such a page, the browser may access memory that has already been freed, leading to heap corruption.
Use-after-free vulnerabilities occur when a program continues to reference memory after it has been deallocated. In this case, the PDF component fails to properly track object lifetimes, allowing subsequent memory operations to corrupt the heap. This can be leveraged by attackers to overwrite critical data structures or function pointers, potentially redirecting program execution to attacker-controlled code.
The attack requires user interaction—specifically, the victim must be convinced to visit a malicious webpage. However, given Chrome's widespread usage, the potential attack surface is significant. Successful exploitation could lead to full compromise of the user's browser session, data exfiltration, or further system compromise depending on sandbox escape capabilities.
Root Cause
The root cause is improper memory management in Chrome's PDF rendering engine where object references are not correctly invalidated upon deallocation. This creates a dangling pointer condition that can be exploited when the freed memory is subsequently reallocated and accessed.
Attack Vector
The attack is network-based and requires user interaction. An attacker must craft a malicious HTML page containing specially formatted PDF content designed to trigger the use-after-free condition. The victim must be enticed to visit this page, typically through phishing emails, malicious advertisements, or compromised legitimate websites.
The exploitation flow involves:
- Attacker creates a webpage with embedded malicious PDF content
- Victim navigates to the malicious page
- Chrome's PDF renderer processes the content
- Memory management flaw is triggered, causing heap corruption
- Attacker potentially achieves code execution within the browser process
Detection Methods for CVE-2023-1530
Indicators of Compromise
- Unexpected Chrome browser crashes when viewing PDF content
- Unusual memory consumption patterns in Chrome processes
- Detection of malicious PDF files or HTML pages in browser cache
- Network traffic to known malicious domains serving exploit payloads
Detection Strategies
- Monitor for Chrome crash reports related to PDF rendering components
- Implement endpoint detection rules for suspicious memory allocation patterns in browser processes
- Deploy web filtering to block access to known exploit delivery domains
- Use behavioral analysis to detect anomalous child process spawning from Chrome
Monitoring Recommendations
- Enable Chrome's built-in crash reporting and analyze reports for PDF-related crashes
- Implement network monitoring for unusual outbound connections following PDF document access
- Monitor process behavior for signs of exploitation such as unexpected code execution paths
How to Mitigate CVE-2023-1530
Immediate Actions Required
- Update Google Chrome to version 111.0.5563.110 or later immediately
- Enable automatic updates in Chrome to receive future security patches
- Implement browser security policies restricting access to untrusted websites
- Consider disabling PDF rendering in the browser and using standalone PDF readers
Patch Information
Google has released a security update addressing this vulnerability. The fix is included in Chrome version 111.0.5563.110 and all subsequent releases. Organizations using Fedora Linux should apply the relevant package updates for Chromium.
For detailed patch information, refer to the Google Chrome Security Update. Additional technical details are available in Chrome Bug Report #1419831.
Fedora users should consult the Fedora Package Announcements for distribution-specific updates. Gentoo users should review GLSA 202309-17.
Workarounds
- Disable Chrome's built-in PDF viewer and use external PDF applications
- Implement strict content security policies to limit exposure to untrusted content
- Use browser isolation solutions to contain potential exploitation attempts
- Block or sandbox downloads of PDF files from untrusted sources
# Disable Chrome's built-in PDF viewer via policy (Windows Registry)
# Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome
# Create DWORD value: AlwaysOpenPdfExternally = 1
# For Linux/macOS, use managed preferences or command-line flag:
# --disable-pdf-extension
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
