CVE-2024-7519 – This vulnerability allows memory corruption thr... (How to Fix)

Q: How do I fix CVE-2024-7519?

1. Open affected application (Firefox/Thunderbird) 2. Click menu button (three horizontal lines) 3. Select Help > About Firefox/Thunderbird 4. Application will check for and install updates automatically 5. Restart the application when prompted

Q: What is the severity of CVE-2024-7519?

CVE-2024-7519 has a CVSS score of 9.6 (CRITICAL). This vulnerability allows memory corruption through insufficient checks in graphics shared memory processing, potentially enabling sandbox escape. It affects Firefox, Firefox ESR, and Thunderbird users running outdated versions. Attackers could exploit this to execute arbitrary code with elevated privileges.

📋 TL;DR

This vulnerability allows memory corruption through insufficient checks in graphics shared memory processing, potentially enabling sandbox escape. It affects Firefox, Firefox ESR, and Thunderbird users running outdated versions. Attackers could exploit this to execute arbitrary code with elevated privileges.

💻 Affected Systems

Products:

Firefox
Firefox ESR
Thunderbird

Versions: Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, Thunderbird < 115.14

Operating Systems: Windows, Linux, macOS

Default Config Vulnerable: ⚠️ Yes

Notes: All default configurations of affected versions are vulnerable. The vulnerability is in the graphics shared memory processing component.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise via sandbox escape leading to arbitrary code execution with user privileges, potentially enabling further lateral movement or data exfiltration.

🟠

Likely Case

Local privilege escalation allowing attackers to break out of browser sandbox and execute code with user-level permissions on the host system.

🟢

If Mitigated

Limited impact if browser sandbox is properly configured and other security controls prevent successful exploitation, though memory corruption could still cause crashes.

🌐 Internet-Facing: HIGH - Web browsers are inherently internet-facing and can be targeted through malicious websites or content.

🏢 Internal Only: MEDIUM - Internal users could be targeted through phishing or compromised internal websites, but requires user interaction.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires user interaction (visiting malicious website or opening malicious content). The vulnerability is in shared memory handling which typically requires precise timing and memory manipulation.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firefox 129+, Firefox ESR 115.14+, Firefox ESR 128.1+, Thunderbird 128.1+, Thunderbird 115.14+

Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2024-33/

Restart Required: Yes

Instructions:

1. Open affected application (Firefox/Thunderbird)
2. Click menu button (three horizontal lines)
3. Select Help > About Firefox/Thunderbird
4. Application will check for and install updates automatically
5. Restart the application when prompted

🔧 Temporary Workarounds

Disable JavaScript

all

Temporarily disable JavaScript to reduce attack surface while waiting for patch

In Firefox/Thunderbird address bar, type about:config
Search for javascript.enabled
Set value to false

Use Content Security Policy

all

Implement strict CSP headers to limit script execution

Add header: Content-Security-Policy: script-src 'self'

🧯 If You Can't Patch

Disable browser usage for high-risk users
Implement application whitelisting to prevent unauthorized browser execution

🔍 How to Verify

Check if Vulnerable:

Check browser version in Help > About Firefox/Thunderbird and compare with affected versions list

Check Version:

firefox --version or thunderbird --version on Linux/macOS

Verify Fix Applied:

Verify version is updated to patched version (Firefox 129+, Firefox ESR 115.14+, Firefox ESR 128.1+, Thunderbird 128.1+, Thunderbird 115.14+)

📡 Detection & Monitoring

Log Indicators:

Browser crash reports with memory corruption signatures
Unexpected browser process termination
Sandbox violation events in system logs

Network Indicators:

Connections to known malicious domains serving exploit code
Unusual outbound connections after browser usage

SIEM Query:

source="browser_logs" AND (event="crash" OR event="memory_violation") AND version<"129"

📊 Metadata

CVE ID: CVE-2024-7519

CVSS v3 Score: 9.6 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CWE: CWE-787

Published: August 6, 2024

Last Updated: August 12, 2024

🔗 References

https://bugzilla.mozilla.org/show_bug.cgi?id=1902307 Issue Tracking,Permissions Required
https://www.mozilla.org/security/advisories/mfsa2024-33/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-34/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-35/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-37/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-38/ Vendor Advisory

📤 Share & Export

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🔗 Related Vulnerabilities

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