Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. This vulnerability affects Thunderbird versions prior to 68.7.0, Firefox versions prior to 74.0.1, and Firefox ESR versions prior to 68.6.1. With a CVSS score of 8.1, this high-severity flaw poses significant risks, as it is exploitable over the network and requires no user interaction.
Risk to organizations includes potential unauthorized access and data integrity issues, as attackers may leverage this vulnerability to execute arbitrary code. We are aware of targeted attacks in the wild abusing this flaw, highlighting the urgency for defenders to address this issue immediately.
Organizations should prioritize patching immediately to mitigate risks associated with this vulnerability. Applying updates per vendor instructions is crucial to safeguard systems and users.
This vulnerability is confirmed to be included in the Known Exploited Vulnerabilities (KEV) catalog, indicating its recognized threat level in the cybersecurity landscape, and organizations should take action as soon as possible.
Further investigation into this vulnerability reveals a race condition that can be exploited under specific conditions. The implications of a successful exploit could lead to severe impacts, including compromise of sensitive information and disruption of services.
Vulnerability Details
This vulnerability allows a use-after-free condition when the nsDocShell destructor is invoked under certain circumstances. The flaw is classified under CWE-416 and CWE-362, both indicating issues with memory management and race conditions. The vulnerability has a CVSS score of 8.1, demonstrating its high severity, and affects Mozilla products including Firefox and Thunderbird.
The CVSS metrics indicate a network attack vector, high attack complexity, and no required privileges or user interaction, leading to high confidentiality, integrity, and availability impacts.
Publication date of this vulnerability is April 24, 2020, and it has been actively monitored and analyzed since then. Organizations using affected versions should take immediate action to apply the necessary patches.
Technical Analysis
The root cause of this vulnerability is a race condition during the nsDocShell destructor, which leads to a use-after-free situation. The attack vector is network-based, and the attack complexity is classified as high, meaning that exploitation may require a sophisticated approach. Importantly, no privileges are required to exploit this vulnerability, and no user interaction is needed, which increases the risk for organizations.
The impacts of a successful exploit could compromise confidentiality, integrity, and availability of the affected systems, leading to potential data breaches or denial of service.
Risk & Impact Analysis
The real-world risk associated with this vulnerability is significant, especially for organizations that rely on Mozilla Firefox and Thunderbird for their operations. With the vulnerability being actively exploited in the wild, the blast radius could extend to any organization utilizing these products, leading to unauthorized access and data leakage.
The urgency assessment based on CVSS indicates that organizations should prioritize remediation efforts immediately. The vulnerability's classification as high severity, combined with its presence in the KEV catalog, emphasizes the need for swift action.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerable versions include Thunderbird versions prior to 68.7.0, Firefox versions prior to 74.0.1, and Firefox ESR versions prior to 68.6.1. Organizations should ensure they update to the latest versions as part of their remediation process.
Mitigation & Remediation
Mozilla has provided updates to address this vulnerability. Organizations should apply updates per vendor instructions to ensure their systems are not affected. For additional guidance on security assessments, organizations can refer to application security assessments and consider implementing continuous security measures to monitor for similar vulnerabilities in the future.
Detection Guidance
To detect potential exploitation attempts of CVE-2020-6819, organizations should monitor their logs for unusual activity related to Firefox and Thunderbird. Behavioral anomalies, such as unexpected crashes or memory errors, may indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the critical importance of maintaining updated software and staying informed about known vulnerabilities. Security teams should regularly review their vulnerability management programs to ensure they can rapidly respond to newly discovered threats. For best practices in vulnerability management, organizations can refer to vulnerability management program design and consider adopting strategies for continuous penetration testing to proactively identify and mitigate risks.
Maintaining awareness of trends in exploit activity, such as those seen with CVE-2020-6819, can provide valuable insights for security teams. For insights into penetration testing methodologies, organizations can explore penetration testing methodology to enhance their defensive posture against future vulnerabilities.
Organizations should also consider the implications of ransomware on their systems and review their defenses accordingly. For guidance on defensive strategies against ransomware, organizations can refer to ransomware attack statistics to stay informed on the evolving threat landscape.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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