CVE-2021-27365 : What You Need to Know
Learn about CVE-2021-27365, a Linux kernel vulnerability allowing unauthorized users to exploit iSCSI data structures. Find details, impact, and mitigation strategies here.
An issue was discovered in the Linux kernel through version 5.11.3 where certain iSCSI data structures lack appropriate length constraints, allowing an unprivileged user to send a Netlink message with a length exceeding the PAGE_SIZE value.
Understanding CVE-2021-27365
This section will provide insights into the impact, technical details, and mitigation strategies for CVE-2021-27365.
What is CVE-2021-27365?
CVE-2021-27365 is a vulnerability found in the Linux kernel, allowing unprivileged users to exploit iSCSI data structures by sending Netlink messages of excessive length.
The Impact of CVE-2021-27365
The vulnerability enables unauthorized users to manipulate iSCSI data structures, potentially leading to privilege escalation or unauthorized access to sensitive information.
Technical Details of CVE-2021-27365
Let's dive deeper into the specifics of the vulnerability.
Vulnerability Description
Certain iSCSI data structures lack proper length constraints, enabling malicious users to send Netlink messages of excessive length, compromising system security.
Affected Systems and Versions
The Linux kernel through version 5.11.3 is impacted by this vulnerability, potentially affecting systems with iSCSI configurations.
Exploitation Mechanism
An unprivileged user can exploit the flawed iSCSI data structures by sending a crafted Netlink message exceeding the PAGE_SIZE value.
Mitigation and Prevention
Discover the necessary steps to secure your systems against CVE-2021-27365.
Immediate Steps to Take
It is recommended to apply vendor patches promptly to mitigate the vulnerability. Additionally, adopting the principle of least privilege can reduce the risk of exploitation.
Long-Term Security Practices
Regularly update your systems, monitor security advisories, and educate users about safe computing practices to enhance overall security posture.
Patching and Updates
Stay current with Linux kernel security updates and ensure that the patched versions are deployed across all relevant systems to prevent potential exploitation.