CVE-2018-1093 : Security Advisory and Response

The Linux kernel through version 4.15 is vulnerable to a denial of service attack due to an out-of-bounds read in the ext4_valid_block_bitmap function.

Understanding CVE-2018-1093

This CVE involves a vulnerability in the Linux kernel that can be exploited for a denial of service attack.

What is CVE-2018-1093?

The ext4_valid_block_bitmap function in fs/ext4/balloc.c within the Linux kernel is prone to a denial of service attack. By using a manipulated ext4 image, attackers can trigger an out-of-bounds read, leading to a system crash.

The Impact of CVE-2018-1093

The vulnerability allows attackers to crash systems by exploiting the out-of-bounds read in the Linux kernel, affecting system availability and potentially causing disruptions.

Technical Details of CVE-2018-1093

This section provides more technical insights into the CVE-2018-1093 vulnerability.

Vulnerability Description

The root cause of the vulnerability lies in the ext4_valid_block_bitmap function in fs/ext4/balloc.c, where improper verification of bitmap block numbers occurs, making the system susceptible to the exploit.

Affected Systems and Versions

Product: Linux kernel through version 4.15
Vendor: n/a

Exploitation Mechanism

Attackers can exploit this vulnerability by using a manipulated ext4 image, triggering an out-of-bounds read that leads to a system crash.

Mitigation and Prevention

Protecting systems from CVE-2018-1093 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant security patches provided by the Linux kernel maintainers.
Monitor official sources for updates and advisories related to this vulnerability.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.
Implement secure coding practices to prevent similar out-of-bounds read issues.

Patching and Updates

Refer to vendor advisories and official sources for patches and updates related to CVE-2018-1093.