CVE-2019-18609
📋 TL;DR
CVE-2019-18609 is an integer overflow vulnerability in rabbitmq-c library versions before 0.10.0 that allows a malicious AMQP server to trigger heap memory corruption in client applications. This affects any application using vulnerable rabbitmq-c versions to connect to untrusted AMQP servers. The vulnerability can lead to remote code execution or denial of service.
💻 Affected Systems
- rabbitmq-c library
- Applications using rabbitmq-c library
📦 What is this software?
Fedora by Fedoraproject
Fedora by Fedoraproject
Rabbitmq C by Rabbitmq C Project
Ubuntu Linux by Canonical
Ubuntu Linux by Canonical
Ubuntu Linux by Canonical
Ubuntu Linux by Canonical
Ubuntu Linux by Canonical
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on client systems when connecting to malicious AMQP servers, potentially leading to full system compromise.
Likely Case
Denial of service through application crashes when connecting to malicious or compromised AMQP servers.
If Mitigated
Limited impact if applications only connect to trusted AMQP servers with proper network segmentation.
🎯 Exploit Status
Exploitation requires control of an AMQP server that vulnerable clients connect to. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: rabbitmq-c 0.10.0 and later
Vendor Advisory: https://github.com/alanxz/rabbitmq-c/blob/master/ChangeLog.md
Restart Required: Yes
Instructions:
1. Update rabbitmq-c to version 0.10.0 or later. 2. Rebuild and redeploy any applications using rabbitmq-c. 3. Restart affected services.
🔧 Temporary Workarounds
Network segmentation
linuxRestrict client applications to connect only to trusted AMQP servers within controlled network segments.
iptables -A OUTPUT -p tcp --dport 5672 -d trusted_server_ip -j ACCEPT
iptables -A OUTPUT -p tcp --dport 5672 -j DROP
🧯 If You Can't Patch
- Implement strict network controls to ensure applications only connect to trusted AMQP servers
- Monitor for unusual connection attempts or application crashes related to AMQP connections
🔍 How to Verify
Check if Vulnerable:
Check rabbitmq-c library version: ldd /path/to/application | grep rabbitmq-c, then check version in library metadataCheck Version:
pkg-config --modversion rabbitmq-cVerify Fix Applied:
Verify rabbitmq-c version is 0.10.0 or later: rabbitmq-c-config --version or check library version📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults when connecting to AMQP servers
- Memory corruption errors in application logs
Network Indicators:
- Connections to unexpected or unauthorized AMQP servers
- Unusual AMQP protocol traffic patterns
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "heap corruption") AND "rabbitmq"🔗 References
- https://github.com/alanxz/rabbitmq-c/blob/master/ChangeLog.md
- https://github.com/alanxz/rabbitmq-c/commit/fc85be7123050b91b054e45b91c78d3241a5047a
- https://lists.debian.org/debian-lts-announce/2019/12/msg00004.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WA7CPNVYMF6OQNIYNLWUY6U2GTKFOKH3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQER6XTKYMHNQR7QTHW7DJAH645WQROU/
- https://news.ycombinator.com/item?id=21681976
- https://security.gentoo.org/glsa/202003-07
- https://usn.ubuntu.com/4214-1/
- https://usn.ubuntu.com/4214-2/
- https://github.com/alanxz/rabbitmq-c/blob/master/ChangeLog.md
- https://github.com/alanxz/rabbitmq-c/commit/fc85be7123050b91b054e45b91c78d3241a5047a
- https://lists.debian.org/debian-lts-announce/2019/12/msg00004.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WA7CPNVYMF6OQNIYNLWUY6U2GTKFOKH3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQER6XTKYMHNQR7QTHW7DJAH645WQROU/
- https://news.ycombinator.com/item?id=21681976
- https://security.gentoo.org/glsa/202003-07
- https://usn.ubuntu.com/4214-1/
- https://usn.ubuntu.com/4214-2/
