CVE-2025-25065
📋 TL;DR
This CVE describes a Server-Side Request Forgery (SSRF) vulnerability in Zimbra Collaboration's RSS feed parser. It allows attackers to redirect requests to internal network endpoints, potentially accessing sensitive internal services. Affected users are those running Zimbra Collaboration 9.0.0 before Patch 43, 10.0.x before 10.0.12, or 10.1.x before 10.1.4.
💻 Affected Systems
- Zimbra Collaboration
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, or pivot to other internal systems, potentially leading to full network compromise.
Likely Case
Unauthorized access to internal HTTP endpoints, information disclosure from internal services, or limited internal network reconnaissance.
If Mitigated
Limited impact if network segmentation restricts internal service access or if vulnerable component is not internet-facing.
🎯 Exploit Status
SSRF vulnerabilities typically have low exploitation complexity when the vulnerable endpoint is accessible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.0.0 Patch 43, 10.0.12, or 10.1.4
Vendor Advisory: https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Restart Required: Yes
Instructions:
1. Backup your Zimbra installation. 2. Download the appropriate patch from Zimbra's release pages. 3. Apply the patch following Zimbra's upgrade documentation. 4. Restart Zimbra services.
🔧 Temporary Workarounds
Disable RSS Feed Parser
linuxTemporarily disable the vulnerable RSS feed parser functionality.
zmprov mcf +zimbraFeatureRSSFeedsEnabled FALSE
zmmailboxdctl restart
Network Segmentation
linuxRestrict Zimbra server's outbound network access to internal services.
iptables -A OUTPUT -p tcp --dport 80 -j DROP
iptables -A OUTPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to limit Zimbra server's access to internal services.
- Deploy a web application firewall (WAF) with SSRF protection rules.
🔍 How to Verify
Check if Vulnerable:
Check Zimbra version: su - zimbra -c 'zmcontrol -v' and compare against affected versions.Check Version:
su - zimbra -c 'zmcontrol -v'Verify Fix Applied:
Verify version is 9.0.0 Patch 43 or higher, 10.0.12 or higher, or 10.1.4 or higher.📡 Detection & Monitoring
Log Indicators:
- Unusual RSS feed parsing requests
- Outbound HTTP requests from Zimbra to internal IP ranges
Network Indicators:
- HTTP requests from Zimbra server to internal services on non-standard ports
SIEM Query:
source="zimbra.log" AND "RSS" AND ("127.0.0.1" OR "192.168." OR "10." OR "172.16.")