A server-side request forgery (SSRF) vulnerability has been discovered in Zimbra Collaboration, an open-source email and collaboration platform. This vulnerability can lead to unauthorized redirection to internal network endpoints, potentially exposing sensitive information. In this blog post, we will dive deep into the details of the CVE-2025-25065 vulnerability, including how it works, its impact, and what you can do to protect your systems.
Affected Versions
Zimbra Collaboration versions 9.. before Patch 43, 10..x before 10..12, and 10.1.x before 10.1.4 are susceptible to this vulnerability.
Overview of SSRF
Server-side request forgery (SSRF) is a type of vulnerability that enables an attacker to make requests from a vulnerable server to internal network resources. In essence, SSRF allows an attacker to target internal systems by making the victim server act as a proxy. This can lead to the disclosure of information or even remote code execution in some cases.
The Vulnerability (CVE-2025-25065)
The SSRF vulnerability in Zimbra Collaboration is present in the platform's RSS feed parser. When an attacker submits an RSS feed URL with a maliciously crafted payload, Zimbra's server can be tricked into issuing requests to internal network resources, potentially exposing sensitive information or causing service disruptions.
Here's a code snippet demonstrating a possible exploit
GET /service/extension/proxy?url=http://web.internal/ HTTP/1.1
Host: zimbra.example.com
User-Agent: Mozilla/5. (X11; Ubuntu; Linux x86_64; rv:92.) Gecko/20100101 Firefox/92.
Accept: text/html,application/xhtml+xml,application/xml;q=.9,image/webp,*/*;q=.8
Accept-Language: en-US,en;q=.5
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Pragma: no-cache
Cache-Control: no-cache
In the example URL above ('http://web.internal/'), 'web.internal' represents an internal resource that the attacker wishes to obtain information from.
Original References
For in-depth technical details of the vulnerability and patches, refer to Zimbra's official security advisory:
- Zimbra XSS and SSRF Vulnerabilities Patched in 9.. P27
You can find the CVE information here
Mitigation and Remediation
To remediate this vulnerability, Zimbra users are advised to update their Zimbra Collaboration installations to the latest patched versions as follows:
Zimbra 10.1.x users: Update to version 10.1.4 or later
It is also crucial for organizations using Zimbra Collaboration to conduct regular security assessments, implement least privilege principles, and follow best practices for securing web applications.
Conclusion
The CVE-2025-25065 SSRF vulnerability in Zimbra Collaboration highlights the importance of staying up-to-date on security patches and following best practices to guard against emerging threats. By understanding the nature of this vulnerability and taking appropriate remediation measures, you can ensure that your Zimbra infrastructure remains safe and secure.
Timeline
Published on: 02/03/2025 20:15:37 UTC
Last modified on: 03/13/2025 21:15:43 UTC