CVE-2021-39172 is a high-severity vulnerability found in Cachet, an open source status page system. This vulnerability allows authenticated users, regardless of their privileges (User or Admin), to exploit a new line injection in the configuration edition feature, specifically in mail settings, leading to arbitrary code execution on the server. The CVSS score of this vulnerability is 8.8, indicating a high level of risk. Organizations should prioritize patching immediately.
The vulnerability was publicly disclosed on August 27, 2021, and has been addressed in version 2.5.1 of Cachet. This update improved the UpdateConfigCommandHandler and prevented the use of new line characters in configuration values. With the potential for attackers to gain significant control over affected systems, the urgency for defenders to apply the patch cannot be overstated.
Risk to organizations includes unauthorized access to sensitive data and system integrity breaches. Organizations using vulnerable versions of Cachet must act swiftly to mitigate these risks. Failure to do so may result in severe consequences, including data breaches and operational disruptions.
To further enhance security, it is recommended to restrict access to the administration dashboard to trusted source IP addresses as a temporary workaround until the patch is applied.
Vulnerability Details
Cachet prior to version 2.5.1 is affected by this vulnerability. The official description states that it allows arbitrary code execution due to a new line injection in configuration settings. The vulnerability is classified as CWE-93 (Improper Neutralization of CRLF Sequences in HTTP Headers).
The vulnerability exhibits a CVSS score of 8.8, indicating high severity. The attack vector is network-based, with low complexity and low privileges required. No user interaction is necessary for exploitation.
The vulnerability was published on August 27, 2021, and the affected version is all versions prior to 2.5.1. The issue has a significant confidentiality, integrity, and availability impact, all rated high.
Technical Analysis
The root cause of CVE-2021-39172 lies in the handling of user input within the configuration edition feature of Cachet. Specifically, the system fails to properly validate and sanitize input, allowing malicious users to inject new line characters into configuration settings. This can lead to arbitrary code execution, as attackers can manipulate the server's configuration to execute harmful commands.
The attack vector is network-based, meaning that an attacker can exploit the vulnerability remotely, making it particularly dangerous. The complexity of the attack is low, as it requires minimal effort and low privileges for an authenticated user to exploit the vulnerability. No user interaction is required, which further increases the risk associated with this vulnerability.
Given the high impact on confidentiality, integrity, and availability, organizations using affected versions of Cachet must take immediate action to mitigate this risk.
Risk & Impact Analysis
Real-world deployment of this vulnerability poses significant risks to organizations. Exploitation could allow attackers to gain control over the server, leading to unauthorized access, data manipulation, and service disruptions. The potential blast radius is substantial, impacting not just the affected server but potentially other interconnected systems.
Organizations should assess their exposure to this vulnerability and prioritize remediation based on their risk profile. The urgency for addressing this issue is underscored by the high CVSS score and the confirmed presence of known exploits.
Given that the EPS score is at 0.5554, which places it in the 98th percentile, it indicates a high likelihood of exploitation in the wild. Organizations must act to patch this vulnerability promptly.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch (version 2.5.1) are affected. Organizations running Cachet should ensure they are on the latest version to avoid potential exploitation.
Mitigation & Remediation
Organizations should upgrade to Cachet version 2.5.1 or later to mitigate this vulnerability. If immediate patching is not possible, restrict access to the administration dashboard by allowing only trusted source IP addresses. Regularly review and update security configurations and monitor logs for any suspicious activity.
For further guidance on securing your applications, consider reviewing our resources on application security assessments and implementing comprehensive monitoring solutions.
Detection Guidance
To effectively detect potential exploitation attempts, organizations should monitor logs for unusual patterns, such as unauthorized configuration changes or unexpected access to the administration interface. Additionally, behavioral anomalies should be tracked to identify any irregular activities that could indicate an attempted exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-39172 lies in the increasing trend of misconfigurations leading to severe vulnerabilities, especially in web applications. Security teams should learn from this incident and implement strict validation controls on user inputs, particularly in configuration settings.
This vulnerability serves as a reminder to regularly review and enhance application security measures. For more insights on penetration testing strategies, see our guide on penetration testing methodology and the importance of maintaining a proactive security posture.
Organizations should also consider adopting a comprehensive risk management framework to address vulnerabilities effectively. For detailed assessments, our vulnerability management program can provide valuable insights in identifying and mitigating risks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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