CVE-2024-5496: Google Chrome Use-After-Free Vulnerability

CVE-2024-5496 Overview

CVE-2024-5496 is a use-after-free vulnerability in the Media Session component of Google Chrome before version 125.0.6422.141. A remote attacker can exploit this flaw by serving a crafted HTML page to a victim. Successful exploitation allows arbitrary code execution within the Chrome renderer sandbox. The vulnerability is classified under CWE-416 and affects both Google Chrome desktop and Fedora distributions packaging the affected Chromium builds. Chromium rated the security severity as High, and exploitation requires user interaction such as visiting a malicious site.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome renderer sandbox by luring users to a crafted HTML page, enabling further sandbox escape chains.

Affected Products

Google Chrome versions prior to 125.0.6422.141
Fedora 39 (Chromium package)
Fedora 40 (Chromium package)

Discovery Timeline

2024-05-30 - CVE-2024-5496 published to the National Vulnerability Database (NVD)
2024-12-26 - Last updated in NVD database

Technical Details for CVE-2024-5496

Vulnerability Analysis

The flaw resides in Chrome's Media Session implementation, which manages metadata and playback controls for audio and video content. The component handles media keys, lock-screen integration, and JavaScript-facing APIs such as navigator.mediaSession. A use-after-free condition occurs when an object tied to a media session is freed while another reference still points to the same memory region.

When the dangling pointer is later dereferenced, attacker-controlled data can occupy the freed allocation. This grants control over object virtual tables or function pointers used during media session operations. The result is arbitrary code execution within the renderer process. The renderer remains constrained by Chrome's sandbox, but combining this primitive with a sandbox escape produces full system compromise.

Root Cause

The root cause is incorrect object lifetime management in the Media Session module, tracked in the Chromium issue tracker as 338929744. Reference counting or ownership semantics fail to keep the underlying object alive across asynchronous boundaries. Attacker-driven JavaScript triggers allocation, deallocation, and reuse sequences against media session objects to land a controlled overlap.

Attack Vector

Exploitation requires the victim to load attacker-controlled HTML or JavaScript in Chrome. The page invokes Media Session APIs in a sequence that triggers the freed-object reuse. No authentication or special privileges are required, but user interaction is needed because the victim must visit the malicious resource. The vulnerability is reachable across the network, making drive-by exploitation through compromised sites or malvertising practical.

No public proof-of-concept or exploit code has been published for CVE-2024-5496. Refer to the Chromium Issue Tracker Entry and the Google Chrome Desktop Update for vendor technical context.

Detection Methods for CVE-2024-5496

Indicators of Compromise

Chrome renderer process crashes (chrome.exe child processes) with access violation signatures referencing media_session symbols
Unexpected child process creation from a Chrome renderer, including shells, scripting hosts, or rundll32.exe
Outbound connections from a renderer process to uncategorized or newly registered domains immediately after a crash event
Browser telemetry showing user navigation to attacker-controlled pages followed by anomalous Chrome behavior

Detection Strategies

Monitor endpoint telemetry for Chrome renderer crashes correlated with navigation events to low-reputation domains
Inspect process trees for renderer-to-shell or renderer-to-LOLBin spawn chains, which indicate post-exploitation activity
Apply behavioral analytics to flag memory-corruption crash signatures in chrome.dll modules tied to media session code paths
Track Chrome version inventory across the fleet and alert on hosts still running builds prior to 125.0.6422.141

Monitoring Recommendations

Centralize Chrome crash dumps and stack traces in a SIEM or data lake for correlation with web proxy logs
Enable browser management policies that report installed versions to a central console for compliance auditing
Alert on EDR-level behavioral detections for renderer sandbox escape attempts and unsigned code injection into browser processes
Review proxy and DNS logs for repeated hits to domains preceding renderer instability

How to Mitigate CVE-2024-5496

Immediate Actions Required

Update Google Chrome to 125.0.6422.141 or later on all desktop endpoints
Update Fedora 39 and Fedora 40 Chromium packages using the vendor-provided security advisories
Enforce automatic browser updates through enterprise policy to prevent version drift
Restrict execution of unsigned binaries spawned from browser processes via application control

Patch Information

Google released the fix in the Stable channel update for Chrome 125.0.6422.141. Details are available in the Google Chrome Desktop Update advisory. Fedora published corresponding package updates in the Fedora Package Announcement for Fedora 39 and the Fedora Package Announcement for Fedora 40.

Workarounds

Block access to untrusted websites through web proxy or DNS filtering until patching is complete
Disable or restrict Media Session-dependent functionality via enterprise browser policies where feasible
Deploy Chrome's site isolation and strict sandboxing settings to limit blast radius from renderer compromise
Educate users to avoid clicking unsolicited links and to report unexpected browser crashes

bash

# Verify Chrome version on Linux endpoints
google-chrome --version

# Fedora patching
sudo dnf upgrade --refresh chromium

# Windows: force Chrome update check via Group Policy registry key
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v UpdateDefault /t REG_DWORD /d 1 /f