Zimbra Collaboration Suite Server-Side-Request-Forgery (SSRF) Scanner

Zimbra Collaboration Suite is a widely used communication platform that offers a collaboration solution for email, calendaring, tasks, and more. It's primarily used by enterprises, educational institutions, and service providers for seamless communication across their networks. The software integrates well with various third-party services, making it a flexible option for different organizational needs. With its extensive user base, Zimbra is a trusted choice for managing organizational communication. The platform is known for offering robust security features to protect sensitive information. However, vulnerabilities can affect its performance and security, requiring careful management and regular updates.

Server-Side Request Forgery (SSRF) is a vulnerability that allows an attacker to manipulate server-side HTTP requests. In the context of Zimbra Collaboration Suite, this vulnerability can be triggered by remote unauthenticated attackers. By exploiting SSRF, attackers can potentially access internal systems and third-party services via the vulnerable server. This manipulation may lead to unauthorized data access or the introduction of malicious code. The severity of SSRF lies in its capability to bypass server-side access controls, potentially exposing sensitive data or configurations. The impact of SSRF can vary based on the server's architecture and the availability of internal resources.

The vulnerability in Zimbra Collaboration Suite is identified in the endpoint "/service/error/sfdc_preauth.jsp." The parameter "server" is the vector through which the SSRF can be executed. Attackers can exploit this by including a URL in the server parameter that points to a resource they control. This could potentially allow the attacker to retrieve sensitive data or induce unnecessary network traffic. When interacted with a server, HTTP interaction confirms the presence of SSRF. Attackers utilize this weakness to redirect or extract information, posing a serious security threat. Ensuring that input validation is strict and thorough can help mitigate such vulnerabilities.

If exploited, this vulnerability can have severe consequences, including unauthorized access to internal servers and sensitive data. An attacker could manipulate requests to interact with unsecured internal services, potentially leading to data breaches. Unauthorized data extraction, data manipulation, and server compromise are possible outcomes. Additionally, attackers could use the SSRF vulnerability to facilitate further attack vectors, such as pivoting to attack other systems inside the network. Exploitation of SSRF could ultimately result in downtime, reputational damage, and financial loss for affected organizations. It is imperative to address such vulnerabilities swiftly to prevent exploitation.

REFERENCES

• https://www.adminxe.com/2183.html
• https://nvd.nist.gov/vuln/detail/CVE-2020-7796
• https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P7