CVE-2022-28733 : Security Advisory and Response

Integer underflow vulnerability in grub_net_recv_ip4_packets in GNU GRUB allows attackers to trigger an integer underflow via a crafted IP packet, potentially leading to buffer overflow.

Understanding CVE-2022-28733

This vulnerability, with a CVSS base score of 8.1 (High), affects GNU GRUB on Linux platforms and can result in high impacts on confidentiality, integrity, and availability.

What is CVE-2022-28733?

CVE-2022-28733 is an integer underflow vulnerability in the

grub_net_recv_ip4_packets

function of GNU GRUB. An attacker can exploit this by sending a maliciously crafted IP packet, causing the total length value to wrap around to a small integer, leading to memory allocation issues and potential buffer overflow.

The Impact of CVE-2022-28733

This vulnerability can be exploited to write beyond the allocated buffer, potentially allowing attackers to execute arbitrary code, crash the system, or obtain sensitive information.

Technical Details of CVE-2022-28733

This section delves deeper into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises due to an integer underflow in the

grub_net_recv_ip4_packets

function. By manipulating the

total_len

value, an attacker can trigger a buffer overflow scenario.

Affected Systems and Versions

GNU GRUB versions less than 2.06-3 on Linux platforms are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit CVE-2022-28733 by sending a malicious IP packet, causing the

total_len

value to wrap around and trigger an integer underflow, potentially leading to buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2022-28733 requires immediate action and long-term security practices.

Immediate Steps to Take

Update GNU GRUB to version 2.06-3 or later to mitigate the vulnerability.
Monitor network traffic for any signs of exploitation attempts.

Long-Term Security Practices

Implement network segmentation to contain potential attacks.
Educate users about safe browsing habits and cybersecurity awareness.

Patching and Updates

Regularly apply security patches and updates to all software components to prevent known vulnerabilities.