CVE-2019-16714
📋 TL;DR
This vulnerability in the Linux kernel allows attackers to read uninitialized kernel stack memory, potentially exposing sensitive information like encryption keys or passwords. It affects Linux systems running kernels before version 5.2.14. The risk is highest for systems using RDS (Reliable Datagram Sockets) networking.
💻 Affected Systems
- Linux kernel
📦 What is this software?
Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
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Ubuntu Linux by Canonical
Ubuntu Linux by Canonical
⚠️ Risk & Real-World Impact
Worst Case
Attackers could extract sensitive kernel memory contents including encryption keys, passwords, or other privileged data, potentially leading to full system compromise.
Likely Case
Information disclosure of kernel memory contents, which could aid in further attacks or expose system configuration details.
If Mitigated
Limited information exposure with minimal impact if proper network segmentation and access controls are in place.
🎯 Exploit Status
Exploitation requires network access to RDS services and ability to trigger the vulnerable code path. Proof-of-concept code exists in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel 5.2.14 and later
Vendor Advisory: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.14
Restart Required: Yes
Instructions:
1. Update Linux kernel to version 5.2.14 or later. 2. Reboot system. 3. Verify kernel version with 'uname -r'. 4. Check if RDS module is loaded with 'lsmod | grep rds'.
🔧 Temporary Workarounds
Disable RDS module
linuxPrevent loading of the vulnerable RDS kernel module
echo 'install rds /bin/true' >> /etc/modprobe.d/disable-rds.conf
rmmod rds 2>/dev/null || true
Block RDS network traffic
linuxiptables -A INPUT -p rds -j DROP
iptables -A OUTPUT -p rds -j DROP
🧯 If You Can't Patch
- Disable RDS kernel module if not required for your environment
- Implement strict network segmentation to limit access to systems using RDS
🔍 How to Verify
Check if Vulnerable:
Check kernel version with 'uname -r' and verify it's below 5.2.14, then check if RDS is loaded with 'lsmod | grep rds'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is 5.2.14 or higher with 'uname -r' and ensure RDS is either not loaded or updated📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages related to RDS
- Unusual network connections to RDS ports (default 1541)
Network Indicators:
- Unexpected RDS protocol traffic
- Multiple connection attempts to RDS services
SIEM Query:
source="kernel" AND "rds" AND ("panic" OR "oops" OR "BUG")🔗 References
- http://www.openwall.com/lists/oss-security/2019/09/24/2
- http://www.openwall.com/lists/oss-security/2019/09/25/1
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.14
- https://github.com/torvalds/linux/commit/7d0a06586b2686ba80c4a2da5f91cb10ffbea736
- https://security.netapp.com/advisory/ntap-20191031-0005/
- https://support.f5.com/csp/article/K48351130?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4157-1/
- https://usn.ubuntu.com/4157-2/
- http://www.openwall.com/lists/oss-security/2019/09/24/2
- http://www.openwall.com/lists/oss-security/2019/09/25/1
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.14
- https://github.com/torvalds/linux/commit/7d0a06586b2686ba80c4a2da5f91cb10ffbea736
- https://security.netapp.com/advisory/ntap-20191031-0005/
- https://support.f5.com/csp/article/K48351130?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4157-1/
- https://usn.ubuntu.com/4157-2/
