CVE-2023-42754 : Exploit Details and Defense Strategies
Learn about CVE-2023-42754, a vulnerability in the Linux kernel ipv4 stack allowing a local user to crash the system. Explore impacted systems and mitigation steps.
A NULL pointer dereference flaw in the Linux kernel ipv4 stack has been identified as CVE-2023-42754. This vulnerability could allow a local user with CAP_NET_ADMIN privileges to crash the system.
Understanding CVE-2023-42754
This section will cover what CVE-2023-42754 is and its impact, technical details, and mitigation methods.
What is CVE-2023-42754?
CVE-2023-42754 is a vulnerability in the Linux kernel ipv4 stack, allowing a local user with specific privileges to crash the system due to a NULL pointer dereference flaw.
The Impact of CVE-2023-42754
The impact of this vulnerability could lead to a system crash if exploited by an attacker with CAP_NET_ADMIN privileges.
Technical Details of CVE-2023-42754
CVE-2023-42754 affects several Red Hat Enterprise Linux versions and the Fedora operating system. The vulnerability arises from an assumption related to the socket buffer (skb) before calling __ip_options_compile.
Vulnerability Description
A NULL pointer dereference flaw in the Linux kernel ipv4 stack may allow a local user to crash the system by exploiting certain privileges.
Affected Systems and Versions
Red Hat Enterprise Linux versions 6, 7, 8, and 9 are affected by CVE-2023-42754, along with the Fedora operating system.
Exploitation Mechanism
Exploitation involves rerouting the skb by ipvs, bypassing the assumption that the skb is associated with a device, potentially leading to a system crash.
Mitigation and Prevention
Users and administrators are advised to take immediate steps to address this vulnerability and ensure long-term security practices.
Immediate Steps to Take
Due to the lack of available mitigations meeting Red Hat Product Security criteria, immediate patching or system updates are crucial.
Long-Term Security Practices
Regularly updating systems, monitoring security mailing lists for patches, and following best security practices can help prevent exploitation of vulnerabilities.
Patching and Updates
Apply patches provided by Red Hat for affected versions of Red Hat Enterprise Linux and Fedora to mitigate the risk of exploitation.