CVE-2021-25329 addresses a critical vulnerability in Apache Tomcat, specifically related to an incomplete fix for CVE-2020-9484. This vulnerability allows potential attackers to exploit the Apache Tomcat server under specific configurations that, while considered edge cases, remain critical for organizations to address. With a CVSS score of 7, this vulnerability is classified as high severity, indicating a significant risk to affected systems.
The vulnerability primarily affects versions of Apache Tomcat between 7.0.0 and 7.0.107, 8.5.0 and 8.5.61, 9.0.0-M1 and 9.0.41, as well as the 10.0.0-M1 to 10.0.0 range. Organizations should pay close attention to their deployment configurations, as the attack vector is classified as local, requiring low privileges and exhibiting high attack complexity.
Risk to organizations includes unauthorized access to sensitive data, potential service disruptions, and exploitation of system vulnerabilities. Given the potential impact and the fact that this issue is linked to a previously known vulnerability, organizations should prioritize patching immediately.
As of the latest updates, there is no known public exploit for this vulnerability, but the presence of an incomplete fix heightens the urgency for organizations to assess their systems and implement necessary mitigations.
Vulnerability Details
The described vulnerability allows attackers to exploit an incomplete fix from CVE-2020-9484 under certain conditions in Apache Tomcat. The specific configurations that leave systems vulnerable are rare, but the issues are nonetheless significant. The CVSS score of 7 indicates a high severity level, emphasizing the importance of addressing this issue.
The vulnerability affects the following versions of Apache Tomcat: 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61, and 7.0.0 to 7.0.107. The publication date of this CVE was March 1, 2021. There is currently no CWE classification available for this vulnerability.
Technical Analysis
The root cause of CVE-2021-25329 stems from an inadequate resolution to the issues identified in CVE-2020-9484. Attackers may leverage this vulnerability in local environments where they have low privileges to gain unauthorized access to sensitive information. The attack complexity is rated as high, indicating that specific conditions must be met to exploit this vulnerability, thereby increasing the difficulty for potential attackers.
In terms of impact, the confidentiality, integrity, and availability of data are all at risk due to the nature of the vulnerability. Organizations need to consider the potential damage that could result from exploitation, including data breaches and system outages. User interaction is not required, making the exploitability of this vulnerability even more concerning.
Risk & Impact Analysis
The risk to organizations includes unauthorized access to sensitive data, potential service disruptions, and exploitation of system vulnerabilities. With a CVSS score of 7, organizations should address this vulnerability in their priority patch cycle. The potential for exploitation in local environments, combined with the high attack complexity, underscores the importance of strict access controls and monitoring.
Organizations should also consider the potential blast radius of this vulnerability, as multiple configurations and versions are affected. The urgency for remediation is high, and organizations should plan to implement fixes as soon as possible.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Apache Tomcat include: 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61, and 7.0.0 to 7.0.107. If specific version information is missing, organizations should assume that all versions prior to the vendor patch are affected.
Mitigation & Remediation
Organizations should prioritize patching immediately to prevent exploitation. The recommended actions include upgrading to the latest version of Apache Tomcat and ensuring all dependencies are also updated. For organizations unable to apply the patch immediately, consider implementing strict access controls and monitoring for unusual activities.
For further assistance with security measures, organizations can engage in penetration testing to identify potential vulnerabilities and weaknesses in their systems.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor logs for unusual access patterns, particularly from local users. Behavioral anomalies and any unauthorized changes to system configurations should also be flagged for investigation.
AppSecure Threat Intelligence Insight
This vulnerability highlights the significance of thorough testing and validation of security patches. Organizations should ensure that any updates applied are effective in mitigating known vulnerabilities.
The incomplete fix for CVE-2020-9484 serves as a reminder that vigilance is paramount in cybersecurity. Regular assessments and audits can help identify gaps in defenses. For comprehensive security strategies, organizations can refer to our vulnerability management program and consider adopting best practices from our penetration testing methodology resources.
Understanding the patterns of vulnerabilities, like the one presented in CVE-2021-25329, can significantly enhance an organization's defensive posture. Investing in red teaming exercises can provide insights into threat modeling and enhance awareness of potential exploitation techniques.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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