CVE-2021-3348 : Security Advisory and Response
Learn about CVE-2021-3348, a critical Linux kernel vulnerability (nbd_add_socket) allowing local attackers to trigger a use-after-free issue. Find out about impact, affected systems, exploitation, and mitigation strategies.
A vulnerability with CVE ID CVE-2021-3348 was published on February 1, 2021, affecting Linux kernel versions up to 5.10.12. This vulnerability, known as nbd_add_socket in drivers/block/nbd.c, involves an ndb_queue_rq use-after-free issue that could be exploited by local attackers with access to the nbd device during device setup.
Understanding CVE-2021-3348
This section will cover the essential details regarding CVE-2021-3348.
What is CVE-2021-3348?
The CVE-2021-3348 vulnerability, found in the Linux kernel, allows local attackers with nbd device access to trigger an ndb_queue_rq use-after-free scenario during device setup.
The Impact of CVE-2021-3348
The impact of this vulnerability is significant as it provides an opportunity for local attackers to exploit the use-after-free issue and potentially execute malicious actions.
Technical Details of CVE-2021-3348
Providing in-depth technical information related to CVE-2021-3348.
Vulnerability Description
The specific vulnerability involves the nbd_add_socket function in the Linux kernel's nbd.c file, up to version 5.10.12, leading to a use-after-free condition triggered by I/O requests.
Affected Systems and Versions
All Linux kernel versions up to 5.10.12 are vulnerable to CVE-2021-3348.
Exploitation Mechanism
Local attackers with access to the nbd device can exploit this vulnerability via a strategically timed I/O request during the device setup process.
Mitigation and Prevention
Exploring the strategies to mitigate and prevent the exploitation of CVE-2021-3348.
Immediate Steps to Take
Users and administrators are advised to apply security patches promptly to safeguard the affected systems against potential attacks exploiting this vulnerability.
Long-Term Security Practices
Implementing security best practices and regular system updates can enhance overall security posture and prevent successful exploitation of known vulnerabilities.
Patching and Updates
Regularly monitoring for security updates from Linux kernel maintainers and promptly applying patches is crucial to address vulnerabilities like CVE-2021-3348.