CVE-2022-23097
📋 TL;DR
This vulnerability in Connman's DNS proxy allows attackers to read memory beyond intended boundaries due to improper string length handling. It affects systems running Connman through version 1.40, potentially exposing sensitive information or causing crashes. The vulnerability is particularly concerning for embedded systems and IoT devices that use Connman for network management.
💻 Affected Systems
- Connman
📦 What is this software?
Connman by Intel
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, though this would require additional vulnerabilities to be chained together.
Likely Case
Information disclosure through memory leaks, denial of service via application crashes, or potential privilege escalation in specific configurations.
If Mitigated
Limited impact with proper network segmentation and minimal exposure of affected services.
🎯 Exploit Status
The vulnerability is in DNS handling, making it remotely exploitable without authentication. Public details exist in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.40
Vendor Advisory: https://git.kernel.org/pub/scm/network/connman/connman.git/log/
Restart Required: Yes
Instructions:
1. Update Connman to version after 1.40 using your distribution's package manager. 2. For Debian: apt update && apt upgrade connman. 3. For Gentoo: emerge --sync && emerge -av connman. 4. Restart Connman service or reboot system.
🔧 Temporary Workarounds
Disable DNS proxy
linuxDisable Connman's DNS proxy functionality if not required
Edit /etc/connman/main.conf and set 'EnableDNSProxy=false'
systemctl restart connman
Network filtering
linuxBlock external DNS queries to Connman at network perimeter
iptables -A INPUT -p udp --dport 53 -j DROP
iptables -A INPUT -p tcp --dport 53 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems
- Deploy intrusion detection systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Connman version: connmand --version | grep -i versionCheck Version:
connmand --versionVerify Fix Applied:
Verify version is greater than 1.40: connmand --version📡 Detection & Monitoring
Log Indicators:
- Connman crash logs
- Unexpected memory access errors in system logs
- DNS query failures
Network Indicators:
- Unusual DNS traffic patterns to Connman service
- Malformed DNS packets
SIEM Query:
source="connman" AND (event="crash" OR event="segfault")🔗 References
- https://git.kernel.org/pub/scm/network/connman/connman.git/log/
- https://lists.debian.org/debian-lts-announce/2022/02/msg00009.html
- https://security.gentoo.org/glsa/202310-21
- https://www.debian.org/security/2022/dsa-5231
- https://www.openwall.com/lists/oss-security/2022/01/25/1
- https://git.kernel.org/pub/scm/network/connman/connman.git/log/
- https://lists.debian.org/debian-lts-announce/2022/02/msg00009.html
- https://security.gentoo.org/glsa/202310-21
- https://www.debian.org/security/2022/dsa-5231
- https://www.openwall.com/lists/oss-security/2022/01/25/1
