CVE-2010-4533
📋 TL;DR
CVE-2010-4533 is a vulnerability in offlineimap where SSL v2 protocol support remains enabled despite known security flaws in that protocol. This allows man-in-the-middle attackers to intercept or manipulate email synchronization traffic. Users of offlineimap versions before 6.3.4 are affected.
💻 Affected Systems
- offlineimap
📦 What is this software?
Offlineimap by Offlineimap
⚠️ Risk & Real-World Impact
Worst Case
Complete interception and decryption of email synchronization traffic, credential theft, and email content exposure.
Likely Case
Man-in-the-middle attacks on unsecured networks allowing email interception and potential credential harvesting.
If Mitigated
Limited impact if SSL v2 is disabled or proper certificate validation is enforced.
🎯 Exploit Status
SSL v2 protocol weaknesses are well-documented and exploitation tools exist. Attack requires man-in-the-middle position.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.3.4 and later
Vendor Advisory: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=606962
Restart Required: Yes
Instructions:
1. Update offlineimap to version 6.3.4 or later using your package manager. 2. Restart any running offlineimap processes. 3. Verify SSL v2 is disabled in configuration.
🔧 Temporary Workarounds
Disable SSL v2 in configuration
linuxManually configure offlineimap to disable SSL v2 protocol support
Edit ~/.offlineimaprc and add: ssl_version = tls1
Or use: ssl_version = tls1_2
🧯 If You Can't Patch
- Use VPN or secure tunnel for all email synchronization traffic
- Configure IMAP servers to reject SSL v2 connections
🔍 How to Verify
Check if Vulnerable:
Check offlineimap version with: offlineimap --version | grep -i versionCheck Version:
offlineimap --versionVerify Fix Applied:
Verify version is 6.3.4 or higher and check configuration for SSL v2 settings📡 Detection & Monitoring
Log Indicators:
- SSL v2 handshake attempts in network logs
- Certificate validation failures
Network Indicators:
- SSL v2 protocol negotiation on port 993 (IMAPS)
- Weak cipher suites in SSL/TLS handshakes
SIEM Query:
network.protocol:ssl AND ssl.version:2 AND destination.port:993🔗 References
- https://access.redhat.com/security/cve/cve-2010-4533
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=606962
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4533
- https://security-tracker.debian.org/tracker/CVE-2010-4533
- https://www.openwall.com/lists/oss-security/2010/12/23/2
- https://access.redhat.com/security/cve/cve-2010-4533
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=606962
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4533
- https://security-tracker.debian.org/tracker/CVE-2010-4533
- https://www.openwall.com/lists/oss-security/2010/12/23/2
