CVE-2024-10467: Mozilla Firefox Memory Safety RCE Vulnerability

CVE-2024-10467 Overview

CVE-2024-10467 is a collection of memory safety bugs present in Mozilla Firefox 131, Firefox ESR 128.3, and Thunderbird 128.3. These vulnerabilities showed evidence of memory corruption, and Mozilla presumes that with sufficient effort, some of these could have been exploited to run arbitrary code. The vulnerability encompasses multiple memory corruption issues classified under CWE-787 (Out-of-bounds Write) and CWE-120 (Buffer Copy without Checking Size of Input), representing serious security concerns for users of affected Mozilla products.

The network-accessible nature of these vulnerabilities, combined with the requirement for only user interaction (such as visiting a malicious website or opening a crafted email), makes this a significant threat vector for attackers seeking to compromise end-user systems through browser-based attacks.

Critical Impact

Memory corruption vulnerabilities that could potentially allow attackers to execute arbitrary code on affected systems through malicious web content or email messages.

Affected Products

• Mozilla Firefox versions prior to 132
• Mozilla Firefox ESR versions prior to 128.4
• Mozilla Thunderbird versions prior to 128.4 and prior to 132

Discovery Timeline

• 2024-10-29 - CVE-2024-10467 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2024-10467

Vulnerability Analysis

This vulnerability comprises multiple memory safety bugs affecting the Mozilla Firefox browser engine and Thunderbird email client. The underlying issues involve out-of-bounds write operations (CWE-787) and buffer copy operations that fail to properly validate input size (CWE-120). These memory corruption primitives represent foundational vulnerability classes that attackers commonly chain together to achieve reliable code execution.

The affected components share significant code between Firefox and Thunderbird, meaning the same memory safety issues impact both the web browser and email client. When processing specially crafted content, the affected software may write data beyond allocated buffer boundaries, corrupting adjacent memory regions. This memory corruption can potentially be leveraged to hijack program control flow and execute attacker-supplied code within the context of the vulnerable application.

Root Cause

The root cause stems from insufficient bounds checking and memory safety validation within Firefox and Thunderbird's content processing code. Multiple bugs across different components contributed to this vulnerability, including issues tracked in Mozilla's bug tracking system under bug IDs 1829029, 1888538, 1900394, 1904059, 1917742, 1919809, and 1923706.

The buffer overflow conditions (CWE-120) occur when data is copied into fixed-size buffers without adequate size validation, while the out-of-bounds write issues (CWE-787) result from array indexing or pointer arithmetic that exceeds allocated memory boundaries. These classes of vulnerabilities are particularly dangerous in web browsers due to the complex parsing and rendering operations performed on untrusted content.

Attack Vector

The attack vector for CVE-2024-10467 is network-based and requires user interaction. An attacker could exploit these vulnerabilities by:

1. Crafting a malicious web page containing content designed to trigger the memory corruption bugs
2. Luring a victim to visit the malicious page using a vulnerable Firefox version
3. For Thunderbird users, sending a specially crafted email that triggers the vulnerability when rendered

Once the memory corruption occurs, an attacker with sufficient expertise could potentially manipulate program execution to run arbitrary code with the privileges of the browser or email client process. This could lead to complete system compromise, data theft, or installation of persistent malware.

The vulnerability mechanism involves memory corruption through improper bounds checking during content processing. When the browser or email client parses malicious input, buffer boundaries are exceeded, corrupting adjacent memory structures. For detailed technical analysis, refer to the Mozilla Bug List and the official security advisories.

Detection Methods for CVE-2024-10467

Indicators of Compromise

• Unexpected Firefox or Thunderbird crashes, particularly when viewing specific web content or emails
• Anomalous child process spawning from firefox.exe or thunderbird.exe processes
• Unusual memory consumption patterns in browser processes indicating potential heap spray activities
• Network connections from browser processes to suspicious or unexpected destinations

Detection Strategies

• Monitor for browser process crashes and analyze crash dumps for signs of memory corruption exploitation
• Implement endpoint detection rules to identify suspicious process behavior originating from Firefox or Thunderbird
• Deploy SentinelOne's behavioral AI to detect post-exploitation activities such as unauthorized code execution from browser contexts
• Use network monitoring to detect command-and-control traffic that may follow successful exploitation

Monitoring Recommendations

• Enable enhanced crash reporting to capture and analyze potential exploitation attempts
• Configure SentinelOne agents to monitor Firefox and Thunderbird processes for anomalous behavior patterns
• Implement application-level logging to track content rendering operations and identify potential attack vectors
• Monitor for indicators of drive-by download attacks targeting vulnerable browser versions

How to Mitigate CVE-2024-10467

Immediate Actions Required

• Update Mozilla Firefox to version 132 or later immediately
• Update Mozilla Firefox ESR to version 128.4 or later
• Update Mozilla Thunderbird to version 128.4 or 132 or later
• Enable automatic updates to ensure timely application of future security patches

Patch Information

Mozilla has released security patches addressing these memory safety issues in the following versions:

• Firefox 132 - See Mozilla Security Advisory MFSA-2024-55
• Firefox ESR 128.4 - See Mozilla Security Advisory MFSA-2024-56
• Thunderbird 128.4 - See Mozilla Security Advisory MFSA-2024-58
• Thunderbird 132 - See Mozilla Security Advisory MFSA-2024-59

Linux users should also apply updates from their distribution's package repositories. Debian LTS users can refer to the Debian LTS Announcement October 2024 and Debian LTS Announcement November 2024 for relevant package updates.

Workarounds

• Restrict browsing to trusted websites only until patches can be applied
• Disable JavaScript execution in Firefox via about:config settings (note: this may break website functionality)
• Configure email clients to display messages in plain text mode to reduce attack surface
• Use SentinelOne's application control features to block vulnerable browser versions from executing

# Verify Firefox version from command line
firefox --version

# Verify Thunderbird version from command line
thunderbird --version

# For enterprise deployments, enforce minimum version via policy
# Create policies.json in Firefox installation directory
# Example: /usr/lib/firefox/distribution/policies.json (Linux)
# or C:\Program Files\Mozilla Firefox\distribution\policies.json (Windows)