CVE-2022-32294
📋 TL;DR
Zimbra Collaboration Open Source 8.8.15 logs randomly generated initial login passwords in cleartext via syslog on UDP port 514. This allows attackers with network access to intercept these temporary credentials, potentially gaining unauthorized access to Zimbra administrative functions. Organizations running Zimbra 8.8.15 with default syslog configuration are affected.
💻 Affected Systems
- Zimbra Collaboration Open Source
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers intercept cleartext passwords and gain administrative access to Zimbra, leading to complete compromise of email systems, data exfiltration, and lateral movement within the network.
Likely Case
Attackers capture temporary passwords and gain initial access to Zimbra systems, potentially escalating privileges or accessing sensitive email data.
If Mitigated
With proper network segmentation and syslog encryption, impact is limited to internal network segments only.
🎯 Exploit Status
Exploitation requires network access to UDP 514 and monitoring of syslog traffic. Public GitHub repository contains vulnerability details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.8.15 Patch 31 or later
Vendor Advisory: https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Restart Required: Yes
Instructions:
1. Check current Zimbra version. 2. Apply Zimbra patch 31 or later. 3. Restart Zimbra services. 4. Verify syslog no longer contains cleartext passwords.
🔧 Temporary Workarounds
Disable syslog on UDP 514
linuxDisable cleartext syslog transmission on vulnerable port
sudo systemctl stop rsyslog
sudo ufw deny 514/udp
Comment out UDP syslog lines in /etc/rsyslog.conf
Encrypt syslog traffic
linuxConfigure syslog to use encrypted transport (TCP/TLS)
Configure rsyslog TLS: https://www.rsyslog.com/doc/v8-stable/tutorials/tls_cert_summary.html
🧯 If You Can't Patch
- Implement network segmentation to restrict access to UDP port 514
- Monitor syslog traffic for password leakage and implement alerting
🔍 How to Verify
Check if Vulnerable:
Run 'zmprove ca' command and check if generated password appears in cleartext in /var/log/syslog or via network capture on UDP 514Check Version:
zmcontrol -vVerify Fix Applied:
After patching, run 'zmprove ca' and verify passwords no longer appear in cleartext in syslog📡 Detection & Monitoring
Log Indicators:
- Cleartext password strings in syslog following 'zmprove ca' execution
- Unauthorized login attempts using temporary passwords
Network Indicators:
- UDP 514 traffic containing password strings
- Network sniffing on syslog port
SIEM Query:
source="syslog" AND "password" AND "zmprove"🔗 References
- https://github.com/soheilsamanabadi/vulnerabilitys/blob/main/Zimbra%208.8.15%20zmprove%20ca%20command
- https://github.com/soheilsamanabadi/vulnerabilitys/pull/1
- https://medium.com/%40soheil.samanabadi/zimbra-8-8-15-zmprove-ca-command-incorrect-access-control-8088032638e
- https://wiki.zimbra.com/wiki/Security_Center
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- https://github.com/soheilsamanabadi/vulnerabilitys/blob/main/Zimbra%208.8.15%20zmprove%20ca%20command
- https://github.com/soheilsamanabadi/vulnerabilitys/pull/1
- https://medium.com/%40soheil.samanabadi/zimbra-8-8-15-zmprove-ca-command-incorrect-access-control-8088032638e
- https://wiki.zimbra.com/wiki/Security_Center
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
