CVE-2020-25694
📋 TL;DR
This PostgreSQL vulnerability allows man-in-the-middle attacks when client applications reuse basic connection parameters while dropping security parameters like SSL/TLS settings. Attackers could intercept or modify database communications, potentially accessing sensitive data. Affects PostgreSQL versions before 13.1, 12.5, 11.10, 10.15, 9.6.20, and 9.5.24.
💻 Affected Systems
- PostgreSQL
📦 What is this software?
Postgresql by Postgresql
Postgresql by Postgresql
Postgresql by Postgresql
Postgresql by Postgresql
Postgresql by Postgresql
Postgresql by Postgresql
⚠️ Risk & Real-World Impact
Worst Case
Full database compromise including data theft, data manipulation, and denial of service through intercepted administrative commands.
Likely Case
Credential theft and data exfiltration from intercepted database connections.
If Mitigated
Limited impact if proper network segmentation and encrypted connections are enforced.
🎯 Exploit Status
Requires MITM position and vulnerable client application behavior. No public exploit code identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 13.1, 12.5, 11.10, 10.15, 9.6.20, 9.5.24
Vendor Advisory: https://www.postgresql.org/support/security/
Restart Required: Yes
Instructions:
1. Backup database. 2. Stop PostgreSQL service. 3. Upgrade to patched version. 4. Restart PostgreSQL service. 5. Verify connection security parameters.
🔧 Temporary Workarounds
Enforce SSL/TLS connections
allConfigure PostgreSQL to require SSL/TLS for all connections
# In postgresql.conf: ssl = on
# In pg_hba.conf: hostssl all all 0.0.0.0/0 md5
Update client applications
allEnsure client applications properly preserve all security parameters when creating connections
🧯 If You Can't Patch
- Enforce network segmentation to isolate PostgreSQL from untrusted networks
- Implement VPN or encrypted tunnels for all database connections
🔍 How to Verify
Check if Vulnerable:
Check PostgreSQL version: SELECT version(); and compare with affected versions list.Check Version:
psql -c 'SELECT version();'Verify Fix Applied:
Verify version is patched: SELECT version(); should show 13.1, 12.5, 11.10, 10.15, 9.6.20, 9.5.24 or later.📡 Detection & Monitoring
Log Indicators:
- Unusual connection patterns
- Failed SSL/TLS handshakes
- Connection attempts without encryption
Network Indicators:
- Unencrypted PostgreSQL traffic (port 5432)
- MITM attack signatures in network monitoring
SIEM Query:
source="postgresql.log" AND ("SSL negotiation" OR "connection without encryption")🔗 References
- https://bugzilla.redhat.com/show_bug.cgi?id=1894423
- https://lists.debian.org/debian-lts-announce/2020/12/msg00005.html
- https://security.gentoo.org/glsa/202012-07
- https://security.netapp.com/advisory/ntap-20201202-0003/
- https://www.postgresql.org/support/security/
- https://bugzilla.redhat.com/show_bug.cgi?id=1894423
- https://lists.debian.org/debian-lts-announce/2020/12/msg00005.html
- https://security.gentoo.org/glsa/202012-07
- https://security.netapp.com/advisory/ntap-20201202-0003/
- https://www.postgresql.org/support/security/
