CVE-2019-9621 is a high-severity Server-Side Request Forgery (SSRF) vulnerability that affects the Synacor Zimbra Collaboration Suite (ZCS). This vulnerability allows attackers to exploit the ProxyServlet component, leading to unauthorized access to internal systems. The CVSS score for this vulnerability is 7.5, indicating a significant risk to affected organizations.
Organizations using Zimbra Collaboration Suite versions prior to 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 are vulnerable. The urgency for defenders cannot be overstated, as this type of vulnerability can lead to further internal exploitation.
The vulnerability was published on April 30, 2019, and has been analyzed thoroughly. As of now, it is actively included in the KEV catalog, indicating ongoing concern and attention from security agencies.
Organizations should prioritize patching immediately, as the potential for exploitation is significant. The vulnerability has a high exploitability rating, and steps should be taken to mitigate any risks associated.
Vulnerability Details
Zimbra Collaboration Suite before 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 allows SSRF via the ProxyServlet component. This vulnerability is classified as CWE-918, indicating that it can lead to unintended access to internal resources.
The CVSS score of 7.5 signifies a high severity level, with the attack vector being network-based, low attack complexity, and no privileges required for exploitation. Additionally, the confidentiality impact is rated as high.
Technical Analysis
The root cause of CVE-2019-9621 lies in the inadequate validation of user inputs by the ProxyServlet component, allowing attackers to send crafted requests to internal services. The attack vector is network-based, requiring no user interaction, and can be executed remotely.
The attack complexity is low, and attackers can exploit this vulnerability without needing any special privileges. The impact on confidentiality is high, while integrity and availability remain unaffected.
Risk & Impact Analysis
Risk to organizations includes unauthorized access to internal systems, potentially leading to data breaches or further exploitation. The vulnerability's inclusion in the KEV catalog emphasizes the urgency for organizations to act.
The blast radius for this vulnerability can be significant, particularly for organizations that rely heavily on Zimbra Collaboration Suite for communication and collaboration. Given the high CVSS score and exploitability, organizations should address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of Zimbra Collaboration Suite prior to the following patches: 8.6 patch 13, 8.7.11 patch 10, 8.8.10 patch 7, and 8.8.11 patch 3.
Mitigation & Remediation
To mitigate CVE-2019-9621, organizations should apply the latest patches provided by Synacor. If immediate patching is not feasible, organizations may consider implementing network controls to limit access to the vulnerable ProxyServlet component.
Further guidance can be found in the vendor's documentation, and organizations should consider engaging in penetration testing to validate their security posture.
Detection Guidance
Organizations should monitor logs for unusual requests directed at the ProxyServlet component. Behavioral anomalies and unexpected internal requests can serve as indicators of potential exploitation.
AppSecure Threat Intelligence Insight
The ongoing concern surrounding CVE-2019-9621 exemplifies the importance of regular security assessments and updates to mitigate vulnerabilities in critical systems.
Security teams should take note of this vulnerability as a pattern indicative of broader SSRF threats. Continuous monitoring and proactive assessment strategies are essential to maintain a robust security posture.
For further reading on related security practices, organizations may refer to penetration testing methodology, vulnerability management program design, and cloud penetration testing resources.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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