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CVE-2023-29550

8.8 HIGH
Remote Code Execution

📋 TL;DR

CVE-2023-29550 is a collection of memory safety bugs in Mozilla products that could lead to memory corruption. With sufficient effort, attackers could potentially exploit these vulnerabilities to execute arbitrary code. This affects Firefox, Firefox ESR, Firefox for Android, Focus for Android, and Thunderbird.

💻 Affected Systems

Products:
  • Firefox
  • Firefox ESR
  • Firefox for Android
  • Focus for Android
  • Thunderbird
Versions: Firefox < 112, Firefox ESR < 102.10, Firefox for Android < 112, Focus for Android < 112, Thunderbird < 102.10
Operating Systems: Windows, Linux, macOS, Android
Default Config Vulnerable: ⚠️ Yes
Notes: All default configurations of affected versions are vulnerable. No special configuration required for exploitation.

📦 What is this software?

Firefox by Mozilla

View all CVEs affecting Firefox →

Firefox by Mozilla

View all CVEs affecting Firefox →

Firefox Esr by Mozilla

View all CVEs affecting Firefox Esr →

Focus by Mozilla

View all CVEs affecting Focus →

Thunderbird by Mozilla

View all CVEs affecting Thunderbird →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise, data theft, or ransomware deployment.

🟠

Likely Case

Browser/application crash (denial of service) or limited memory corruption that could be leveraged for further exploitation.

🟢

If Mitigated

No impact if systems are patched or have memory protection controls like ASLR/DEP enabled.

🌐 Internet-Facing: HIGH
🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ⚠️ Yes
Complexity: HIGH

Memory corruption vulnerabilities typically require sophisticated exploitation techniques, but successful exploitation could lead to arbitrary code execution.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firefox 112+, Firefox ESR 102.10+, Firefox for Android 112+, Focus for Android 112+, Thunderbird 102.10+

Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2023-13/

Restart Required: Yes

Instructions:

1. Open the affected application. 2. Go to Help > About Firefox/Thunderbird. 3. Allow the application to check for and install updates. 4. Restart the application when prompted.

🔧 Temporary Workarounds

Disable JavaScript

all

Temporarily reduces attack surface by disabling JavaScript execution, which may prevent exploitation of some memory corruption vulnerabilities.

about:config -> javascript.enabled = false

🧯 If You Can't Patch

  • Restrict network access to vulnerable applications using firewall rules.
  • Implement application whitelisting to prevent execution of unauthorized code.

🔍 How to Verify

Check if Vulnerable:

Check the application version in Help > About Firefox/Thunderbird and compare with affected versions.

Check Version:

firefox --version or thunderbird --version

Verify Fix Applied:

Verify the application version is Firefox 112+, Firefox ESR 102.10+, Firefox for Android 112+, Focus for Android 112+, or Thunderbird 102.10+.

📡 Detection & Monitoring

Log Indicators:

  • Application crash logs with memory access violation errors
  • Unexpected process termination

Network Indicators:

  • Unusual outbound connections from browser processes
  • Suspicious JavaScript payloads in web traffic

SIEM Query:

source="*firefox*" OR source="*thunderbird*" AND (event_type="crash" OR error="memory" OR error="corruption")

📊 Metadata

CVE ID: CVE-2023-29550
CVSS v3 Score: 8.8 (HIGH)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: June 2, 2023
Last Updated: January 10, 2025

🔗 References

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