CVE-2025-50340
📋 TL;DR
An authenticated SOGo Webmail user can send emails impersonating other users by manipulating sender identifiers in email requests. This IDOR vulnerability affects SOGo Webmail versions through 5.6.0. The vendor disputes this is a valid vulnerability, arguing sender verification should occur at the SMTP server level.
💻 Affected Systems
- SOGo Webmail
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could send phishing emails, impersonate executives or administrators, conduct business email compromise attacks, or spread malware using trusted user identities.
Likely Case
Internal users sending unauthorized emails on behalf of colleagues, potentially causing confusion, minor reputation damage, or policy violations.
If Mitigated
With proper SMTP server controls and monitoring, impact is limited to failed email attempts or logged suspicious activity.
🎯 Exploit Status
Exploitation requires understanding of SOGo's email sending API and authenticated access. No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 5.6.0 (check vendor for specific version)
Vendor Advisory: https://www.sogo.nu/
Restart Required: No
Instructions:
1. Check SOGo version with 'sogo-tool' command. 2. Update to latest version via package manager. 3. Verify update with version check. 4. Monitor for any email sending anomalies.
🔧 Temporary Workarounds
SMTP Server Sender Verification
allConfigure SMTP server to verify sender addresses match authenticated user identities
# Configure SMTP server (Postfix example):
# smtpd_sender_restrictions = reject_authenticated_sender_login_mismatch
# smtpd_sender_login_maps = hash:/etc/postfix/sender_login_maps
SOGo Configuration Restriction
allRestrict SOGo to only allow sending from authenticated user's own addresses
# In SOGo configuration (sogo.conf):
# SOGoMailForceExternalSenderAndReplyTo = YES;
# SOGoMailCustomFromEnabled = NO;
🧯 If You Can't Patch
- Implement strict SMTP server sender verification policies
- Enable detailed logging of all email sending attempts and monitor for anomalies
🔍 How to Verify
Check if Vulnerable:
Test authenticated email sending with manipulated sender field. If email sends successfully with unauthorized sender address, system is vulnerable.Check Version:
sogo-tool version | grep VersionVerify Fix Applied:
Attempt same test after patching - should receive error or email should only send from authenticated user's address.📡 Detection & Monitoring
Log Indicators:
- SOGo logs showing email sending with mismatched sender/authenticated user
- SMTP server logs showing emails from unexpected sender addresses
Network Indicators:
- Email traffic with From: headers not matching authenticated users
- Unusual email sending patterns from single authenticated sessions
SIEM Query:
source="SOGo" AND (sender_email != authenticated_user) OR source="mail" AND (smtp_from != smtp_auth)