Integer Overflow Vulnerability in Das U-Boot Affects SquashFS Filesystem Processing

CVE-2024-57254

What is CVE-2024-57254?

CVE-2024-57254 is a critical vulnerability found in Das U-Boot, a widely used open-source bootloader for embedded devices. This specific vulnerability arises from an integer overflow issue during the processing of the SquashFS filesystem, particularly affecting the calculation of symlink sizes. If exploited, this vulnerability could lead to severe disruptions in device boot processes, potentially allowing attackers to manipulate system behavior, causing instability, or executing arbitrary code. Organizations relying on Das U-Boot for device initialization and management are at risk of significant operational setbacks due to this flaw.

Technical Details

The vulnerability exists in the sqfs_inode_size function within Das U-Boot, previous to the version 2025.01-rc1. The flaw is triggered when a crafted SquashFS filesystem is processed, resulting in an integer overflow during symlink size calculations. This issue can be exploited through specially crafted filesystems that induce incorrect calculations, leading to memory corruption or unexpected program behavior.

Potential Impact of CVE-2024-57254

1. System Instability: Exploitation of this vulnerability can lead to instability in the boot process of affected devices, possibly rendering them inoperable and disrupting service delivery.
2. Arbitrary Code Execution: Attackers could potentially execute arbitrary code at boot time, compromising the integrity of the systems relying on Das U-Boot.
3. Unauthorized Access and Control: Malicious actors could manipulate device operations, allowing unauthorized access to critical systems and potentially facilitating further exploits within the network.

References