CVE-2017-16651 is a high-severity vulnerability affecting Roundcube Webmail versions prior to 1.1.10, 1.2.x before 1.2.7, and 1.3.x before 1.3.3. This vulnerability allows unauthorized access to arbitrary files on the host's filesystem, including configuration files. The exploit was observed in the wild in November 2017, highlighting the critical nature of this vulnerability. Attackers must authenticate with valid credentials to initiate the attack, which requires an active session.
The vulnerability is associated with file-based attachment plugins and specific requests (_task=settings&_action=upload-display&_from=timezone). Given the sensitivity of the files that may be accessed, organizations using affected versions of Roundcube Webmail are at significant risk.
The CVSS score of 7.8 indicates a high level of risk, with impacts on confidentiality, integrity, and availability. Organizations should prioritize patching immediately to prevent unauthorized access and potential data breaches.
Remediation involves upgrading to the latest versions of Roundcube Webmail, as outlined in vendor advisories. Organizations should ensure that they have applied all necessary patches to mitigate the risks associated with this vulnerability.
Vulnerability Details
The official description of CVE-2017-16651 states that Roundcube Webmail versions prior to 1.1.10, 1.2.x before 1.2.7, and 1.3.x before 1.3.3 allow unauthorized access to arbitrary files on the host's filesystem, including configuration files. This issue arises due to insufficient input validation, particularly in conjunction with file-based attachment plugins.
The CVSS score assigned to this vulnerability is 7.8, categorized as high severity. The vulnerability impacts confidentiality, integrity, and availability, making it a critical concern for organizations using affected versions of Roundcube Webmail.
Technical Analysis
The root cause of CVE-2017-16651 is related to insufficient input validation in the file-based attachment plugins. Attackers can exploit this vulnerability by sending specially crafted requests that leverage the plugin's functionality to access unauthorized files.
The attack vector is local, requiring the attacker to have authenticated access to the target system. The attack complexity is low, with attackers needing only to be able to authenticate with valid credentials. There is no user interaction needed for the attack to succeed.
The vulnerability's impact is significant, with high implications for confidentiality, integrity, and availability. Organizations must understand these risks to take appropriate action.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive configuration files and personal data, which could lead to data breaches and further exploitation. The vulnerability's exploitation could result in significant reputational damage and legal implications.
Given the CVSS score of 7.8 and its classification as high severity, organizations should address this vulnerability in their priority patch cycle. The impact on business operations can be severe if left unremediated.
The urgency for remediation is critical, especially considering that the vulnerability was actively exploited in the wild. Organizations must act swiftly to apply necessary patches and updates to safeguard their systems.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The following versions of Roundcube Webmail are affected by CVE-2017-16651:
All versions prior to 1.1.10, 1.2.x before 1.2.7, and 1.3.x before 1.3.3 are vulnerable. Organizations must ensure they upgrade to the patched versions to mitigate the risk.
Mitigation & Remediation
To remediate CVE-2017-16651, organizations should apply the following mitigations:
1. Upgrade to Roundcube Webmail version 1.1.10 or later, 1.2.7 or later, or 1.3.3 or later.
2. Review and harden the configuration settings for file-based attachment plugins to limit access to sensitive files.
3. Implement network controls to restrict access to the webmail service, ensuring only authorized users can authenticate.
Organizations should validate remediation effectiveness through penetration testing to identify similar weaknesses.
Detection Guidance
To detect potential exploitation of CVE-2017-16651, organizations should monitor for the following indicators:
1. Unusual access patterns to sensitive files or configuration files in the Roundcube Webmail directory.
2. Logs indicating multiple failed authentication attempts followed by successful logins.
3. Alerts for any changes to user permissions that may indicate unauthorized access.
AppSecure Threat Intelligence Insight
CVE-2017-16651 highlights the ongoing challenges organizations face in securing web applications, particularly those that rely on user authentication. The exploitation of this vulnerability demonstrates the need for robust input validation and regular updates to prevent unauthorized file access.
Security teams should take note of the trends in vulnerabilities related to file disclosure, as they can provide insights into potential weaknesses in their own applications. To mitigate risks, implementation of comprehensive security measures and regular penetration testing is essential.
Organizations can enhance their security posture by adopting a proactive approach to vulnerability management, ensuring they are not only responding to known vulnerabilities but also anticipating and addressing potential threats.
For further reading on best practices in application security, organizations should explore resources such as penetration testing methodology and vulnerability management program design to ensure they stay ahead of threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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