The preferred browser of more than 3% of all internet users, Mozilla Firefox is well-regarded for its perceived ability to deliver a secure and privacy-focused web experience. However, that same widespread usage also makes it a frequent target for malicious actors. Security officers remain vigilant, cultivate awareness, and proactively manage the risks posed by known vulnerabilities to stay ahead of emerging threats and keep their organizations safe. TrueFort is here to help with information about four Firefox vulnerabilities that can affect users when left unaddressed.
Learn more about them to understand the sophisticated nature of modern browser exploits and how patch management, user training, and layered security defenses mitigate their potential impact.
CVE-2024-9680
Summary
CVE-2024-9680 is a critical-severity vulnerability (CVSS 9.8, Critical) that enables remote code execution (RCE) through a use-after-free flaw in Firefox’s rendering engine. This vulnerability allows attackers to execute arbitrary code by luring victims to visit maliciously crafted web pages, potentially leading to unauthorized system access and data breaches.
The CVE is actively being exploited, making it a pressing concern for Firefox users. CVE-2024-9680 requires immediate patching and vigilance from individuals and organizations to mitigate risks.
Refer to our previous coverage of CVE-2024-9680 for more information.
CVE-2024-9936
Summary
CVE-2024-9936 is a high-severity vulnerability (CVSS 7.5, High) caused by a type confusion flaw in Firefox’s JavaScript engine. Exploitation of this vulnerability allows attackers to execute arbitrary code, bypassing security restrictions by embedding malicious scripts into web pages. This can lead to credential theft, privilege escalation, and unauthorized access to sensitive data.
The CVE is among the Firefox vulnerabilities flagged as under active exploitation, emphasizing the urgent need for action. Mozilla and security authorities recommend immediate updates to Firefox to address CVE-2024-9936 and safeguard users and organizations against potential breaches.
Exploitation Process
CVE-2024-9936 stems from a type confusion vulnerability in Firefox’s JavaScript engine. This flaw allows attackers to manipulate browser behavior and bypass normal security boundaries. Exploitation typically involves the use of obfuscated JavaScript code embedded in malicious web pages.
To execute this attack:
- Adversaries create a web page containing specially crafted JavaScript designed to exploit type confusion.
- They lure users to the page via phishing campaigns, fake downloads, or social engineering tactics.
- The malicious JavaScript executes unauthorized commands, potentially compromising sensitive information or installing malware.
Impact and Potential Risks
The primary dangers of CVE-2024-9936 include:
- Credential theft, as attackers may harvest login data stored in the browser.
- Privilege escalation, enabling attackers to gain higher-level access to systems.
- Browser crashes, disrupting workflows and affecting productivity.
This vulnerability can also serve as a stepping stone for broader attacks, particularly if used to establish a foothold in enterprise environments.
Mitigation
Put these best practices in place to effectively mitigate CVE-2024-9936 and other Firefox vulnerabilities:
- Implement device microsegmentation to contain lateral movement if a browser endpoint is compromised.
- Restrict the execution of JavaScript on untrusted websites by using browser security extensions.
- Conduct routine security assessments of endpoint systems to ensure browsers are hardened against known exploits.
Official Patching Information
Mozilla has resolved this issue in Firefox version 123.2.2. Users should ensure their software is updated, and organizations should verify that all endpoints are running the latest version of Firefox.
CVE-2024-8387
Summary
CVE-2024-8387 (CVSS score 9.8, Critical) is a vulnerability related to an out-of-bounds write error in Firefox’s media processing components. This flaw enables attackers to execute arbitrary code by exploiting specially crafted media files, potentially resulting in system compromise and the installation of malicious software.
One of several Firefox vulnerabilities identified in 2024, CVE-2024-8387 has been actively exploited in the wild. Mozilla urges all users to update to the latest Firefox version immediately to mitigate the risks posed by this CVE.
Exploitation Process
CVE-2024-8387 is an out-of-bounds write vulnerability within Firefox’s media processing components. The flaw allows attackers to execute arbitrary code by exploiting how Firefox handles malformed media files.
An attacker might send a victim a phishing email containing a link to a malicious video or audio file. Upon attempting to play the file, Firefox’s media components may trigger a memory error, enabling the attacker to execute their payload. This vulnerability is particularly dangerous because media files are widely shared and trusted by users.
Impact and Potential Risks
The exploitation of CVE-2024-8387 could lead to:
- System compromise, allowing attackers to run unauthorized programs.
- Operational disruptions, as browser crashes may interrupt workflows.
- Broader network vulnerabilities, as compromised systems could be used to launch additional attacks.
Organizations relying on media processing for business-critical applications are especially at risk, making it vital to address this vulnerability promptly.
Mitigation
To reduce exposure to CVE-2024-8387:
- Increase real-time cybersecurity visibility into media traffic by using advanced monitoring tools.
- Disable autoplay for media files in browser settings to prevent automatic execution of potentially harmful content.
- Use sandboxing techniques to confine the impact of any exploits targeting the browser.
Official Patching Information
Mozilla fixed CVE-2024-8387 in Firefox version 123.2.3. Users should prioritize updates and confirm their systems are running the latest version of the browser.
CVE-2024-8383
Summary
CVE-2024-8383 is a high-severity vulnerability (CVSS 7.5, High) caused by insufficient boundary checks during JavaScript execution in Firefox. This flaw allows attackers to exploit memory corruption, enabling remote code execution and potential full system compromise. Victims can be targeted by visiting maliciously crafted websites or clicking on deceptive links.
One of several Firefox vulnerabilities actively being exploited, this CVE should be a top priority for users and organizations to address. Mozilla strongly recommends applying the latest Firefox updates immediately to protect against CVE-2024-8383.
Exploitation Process
CVE-2024-8383 involves insufficient boundary checks in Firefox’s JavaScript execution engine. Attackers exploit this vulnerability by embedding malicious code within web pages, which results in memory corruption. This corruption can then be used to execute code on the victim’s machine.
Exploitation typically involves:
- Crafting a malicious web page with embedded code designed to trigger memory corruption.
- Luring victims to the page via social engineering tactics such as phishing emails.
- Executing the payload to gain unauthorized access or escalate privileges.
Impact and Potential Risks
The consequences of CVE-2024-8383 can include:
- System compromise, allowing attackers to gain full control.
- Data exfiltration, including theft of sensitive business or personal information.
- Propagation of malware across an organization’s network.
Given the potential for full administrative access, this vulnerability represents a critical threat.
Mitigation
To mitigate this vulnerability:
- Adopt zero trust best practices to limit access to sensitive systems.
- Deploy advanced privilege escalation controls to prevent attackers from gaining elevated access.
- Educate users on avoiding suspicious links and web pages to reduce the likelihood of exploitation.
Official Patching Information
CVE-2024-8383 has been addressed in Firefox version 123.2.4. All users are urged to apply this update immediately to prevent exploitation.
Firefox Vulnerabilities: Some Final Thoughts
Firefox vulnerabilities and other CVEs put data, operations, and profits at risk, but there’s a way to stay safe. Mapping business dependencies and controlling lateral movement with TrueFort prevents potential breaches before they happen.
Want a guided tour? Request a demo of TrueFort today and take proactive steps to secure your digital infrastructure.
