Denial of Service Vulnerability in Linux Kernel - CVE-2018-5703
Summary
CVE-2018-5703: The tcp_v6_syn_recv_sock function in net/ipv6/tcp_ipv6.c in the Linux kernel through 4.14.11 allows attackers to cause a denial of service (slab out-of-bounds write) or possibly have unspecified other impact via vectors... Affects linux versions < 4.15.11-1. Fixed in 4.15.11-1. How to fix ↓
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Background
The Linux kernel is a core component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's networking stack, particularly the TCP/IP implementation, is crucial for handling network communications. This vulnerability affects the IPv6 TCP stack, specifically the tcp_v6_syn_recv_sock function, which can lead to severe security implications.
Vulnerability Detail
CVE-2018-5703 is a vulnerability in the Linux kernel that allows attackers to exploit the tcp_v6_syn_recv_sock function, leading to a denial of service through a slab out-of-bounds write. This can potentially allow attackers to crash the system or execute arbitrary code, resulting in significant disruption and security risks. The vulnerability arises from improper handling of certain TLS vectors, making it critical for users to address it promptly.
How To Fix
Minimum fixed version
4.15.11-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can disable IPv6 on their systems to mitigate the risk of exploitation until they can apply the necessary updates. This can be done by adding the following lines to the /etc/sysctl.conf file:
net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1
After making these changes, run the command:
sudo sysctl -p
to apply the new settings.
Conclusion
CVE-2018-5703 is a critical vulnerability in the Linux kernel that poses significant risks to system stability and security. Users are strongly advised to upgrade their kernel to the latest version to mitigate these risks. Additionally, temporary workarounds can help reduce exposure until a full fix is applied.
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FAQ
CVE-2018-5703 is a vulnerability in the Linux kernel that can lead to denial of service through an out-of-bounds write in the TCP/IP stack.
This vulnerability can cause your system to crash or become unresponsive, potentially allowing attackers to execute arbitrary code.
The vulnerability affects Linux kernel versions up to 4.14.11. Users should upgrade to version 4.15.11-1 or later.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without needing to sign up.
If an immediate upgrade is not possible, consider disabling IPv6 as a temporary workaround until you can apply the necessary updates.
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