Mozilla Firefox/Thunderbird, Memory Corruption, CVE-2025-45 (Critical)

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The vulnerability stems from memory safety bugs in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird ESR 128.10. These bugs lead to memory corruption, allowing attackers to potentially execute arbitrary code. The issue arises due to improper handling of objects in memory, which can be exploited via crafted web content or emails. When malicious input triggers memory corruption, it may bypass security checks, leading to remote code execution (RCE) under certain conditions. Mozilla has classified this as critical due to the potential for exploitation with minimal user interaction.

DailyCVE Form:

Platform: Firefox/Thunderbird
Version: <139.0 / <128.11
Vulnerability: Memory Corruption
Severity: Critical
Date: 2025-06-11

Prediction: Patch by 2025-06-20

What Undercode Say:

Exploit Analysis:

  • Crafted JavaScript or HTML payloads trigger heap corruption.
  • Use-after-free (UAF) vulnerabilities allow code execution.
  • Exploits may combine with sandbox escapes.

Protection Commands:

Linux (Debian/Ubuntu)
sudo apt update && sudo apt upgrade firefox thunderbird -y
Windows (PowerShell)
winget upgrade Mozilla.Firefox Mozilla.Thunderbird
macOS
brew update && brew upgrade firefox thunderbird

Mitigation Code:

// Content Security Policy (CSP) header example
Content-Security-Policy: default-src 'self'; script-src 'unsafe-inline'
// Firefox hardening (about:config)
user_pref("security.sandbox.content.level", 2);
user_pref("javascript.options.wasm", false);

Detection Script:

import requests
def check_firefox_version(url):
r = requests.get(url)
if "Firefox/138" in r.headers.get("User-Agent", ""):
return "Vulnerable"
return "Patched"

Log Analysis (Splunk):

index=firefox_logs "Memory corruption" OR "Segfault"
| stats count by src_ip, user_agent

Exploit PoC (Hypothetical):


<script>
let exploit = new ArrayBuffer(0x1000);
// Trigger UAF via crafted object
</script>

Firewall Rule (iptables):

iptables -A INPUT -p tcp --dport 80,443 -m string --string "malicious.js" -j DROP

SIGMA Rule (Detection):

Firefox Memory Corruption Exploit Attempt
description: Detects suspicious JS execution
logsource:
product: firefox
detection:
keywords:
- "Heap overflow"
- "WASM crash"

End of Report.

Sources:

Reported By: nvd.nist.gov
Extra Source Hub:
Undercode

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