CVE-2023-53333
📋 TL;DR
A stack-based buffer overflow vulnerability in the Linux kernel's netfilter DCCP conntrack module allows reading beyond allocated stack memory bounds. This affects Linux systems with DCCP protocol support enabled in netfilter conntrack. Attackers could potentially leak kernel memory or cause denial of service.
💻 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...
Learn more about Linux Kernel →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...
Learn more about Linux Kernel →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...
Learn more about Linux Kernel →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...
Learn more about Linux Kernel →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...
Learn more about Linux Kernel →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...
Learn more about Linux Kernel →⚠️ Risk & Real-World Impact
Worst Case
Kernel memory disclosure leading to information leakage, potential privilege escalation, or system crash/panic.
Likely Case
Denial of service through kernel panic or system instability when processing malicious DCCP packets.
If Mitigated
Limited impact if DCCP is not used or netfilter rules block DCCP traffic.
🎯 Exploit Status
Exploitation requires sending specially crafted DCCP packets to trigger the out-of-bounds read. The vulnerability was discovered through syzkaller fuzzing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel branches via provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/26bd1f210d3783a691052c51d76bb8a8bbd24c67
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable DCCP conntrack support
linuxRemove DCCP protocol from netfilter connection tracking
sudo modprobe -r nf_conntrack_dccp
echo 'blacklist nf_conntrack_dccp' | sudo tee /etc/modprobe.d/blacklist-dccp.conf
Block DCCP traffic at firewall
linuxPrevent DCCP packets from reaching vulnerable systems
sudo iptables -A INPUT -p dccp -j DROP
sudo iptables -A FORWARD -p dccp -j DROP
🧯 If You Can't Patch
- Disable DCCP kernel module if not needed
- Implement network filtering to block all DCCP traffic at perimeter
🔍 How to Verify
Check if Vulnerable:
Check if DCCP conntrack module is loaded: lsmod | grep nf_conntrack_dccpCheck Version:
uname -rVerify Fix Applied:
Check kernel version against patched versions from distribution vendor📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- KASAN stack-out-of-bounds error messages in dmesg
Network Indicators:
- Unusual DCCP traffic patterns
- DCCP packets with malformed headers
SIEM Query:
source="kernel" AND "KASAN" AND "stack-out-of-bounds" AND "nf_conntrack_dccp"🔗 References
- https://git.kernel.org/stable/c/26bd1f210d3783a691052c51d76bb8a8bbd24c67
- https://git.kernel.org/stable/c/337fdce450637ea663bc816edc2ba81e5cdad02e
- https://git.kernel.org/stable/c/5c618daa5038712c4a4ef8923905a2ea1b8836a1
- https://git.kernel.org/stable/c/8c0980493beed3a80d6329c44ab293dc8c032927
- https://git.kernel.org/stable/c/9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8
- https://git.kernel.org/stable/c/c052797ac36813419ad3bfa54cb8615db4b41f15
- https://git.kernel.org/stable/c/ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30
