CVE-2022-1304: E2fsprogs Out-of-Bounds RCE Vulnerability

CVE-2022-1304 Overview

An out-of-bounds read/write vulnerability was discovered in e2fsprogs version 1.46.5, a widely-used set of utilities for creating and maintaining ext2, ext3, and ext4 filesystems. This memory corruption flaw can lead to a segmentation fault and potentially arbitrary code execution when processing a specially crafted filesystem image.

Critical Impact

Attackers can exploit this vulnerability through malicious filesystem images to crash affected utilities or potentially execute arbitrary code on systems running vulnerable versions of e2fsprogs.

Affected Products

• e2fsprogs 1.46.5
• Red Hat Enterprise Linux 6.0, 7.0, and 8.0
• Fedora 35

Discovery Timeline

• April 14, 2022 - CVE-2022-1304 published to NVD
• April 23, 2025 - Last updated in NVD database

Technical Details for CVE-2022-1304

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-bounds Read), though the issue encompasses both out-of-bounds read and write operations. The flaw exists within the e2fsprogs filesystem utilities, which are fundamental tools for managing ext2, ext3, and ext4 filesystems on Linux systems. When these utilities process a specially crafted filesystem image, improper boundary validation allows memory access beyond allocated buffers.

The vulnerability requires local access and user interaction, meaning an attacker would need to convince a user to process a malicious filesystem image using affected e2fsprogs utilities such as e2fsck, mke2fs, or related tools. Successful exploitation can result in complete compromise of confidentiality, integrity, and availability on the affected system.

Root Cause

The root cause stems from insufficient bounds checking when parsing filesystem metadata structures. The e2fsprogs utilities fail to properly validate certain size or offset values within filesystem data structures before using them to access memory. When processing a maliciously crafted filesystem image containing specially manipulated metadata values, the utilities can be tricked into reading or writing beyond the boundaries of allocated memory buffers.

Attack Vector

The attack vector for this vulnerability is local, requiring an attacker to either have direct access to the target system or convince a legitimate user to process a malicious filesystem image. Common attack scenarios include:

• Distributing malicious disk images through file-sharing platforms or email attachments
• Exploiting automated filesystem checking routines that process untrusted storage media
• Targeting systems that automatically mount or inspect removable storage devices

When a user runs e2fsprogs utilities against the crafted filesystem, the out-of-bounds memory access occurs. Depending on the system's memory layout and the specific values in the malicious image, this can result in a crash (denial of service) or potentially achieve arbitrary code execution in the context of the user running the utility.

Detection Methods for CVE-2022-1304

Indicators of Compromise

• Unexpected segmentation faults or crashes when running e2fsprogs utilities (e2fsck, mke2fs, resize2fs, etc.)
• Core dumps generated by e2fsprogs processes during filesystem operations
• Unusual filesystem images or disk files with malformed ext filesystem metadata
• Process crash logs indicating memory access violations in e2fsprogs binaries

Detection Strategies

• Monitor for abnormal termination signals (SIGSEGV, SIGBUS) in e2fsprogs processes
• Implement file integrity monitoring on e2fsprogs binaries to detect tampering
• Review system logs for repeated crashes of filesystem utilities
• Scan for suspicious filesystem images in temporary directories or user download locations

Monitoring Recommendations

• Enable crash reporting and centralized log collection for filesystem utility executions
• Monitor for unusual patterns of filesystem utility invocations, especially on untrusted media
• Implement endpoint detection to track e2fsprogs binary execution and associated file access
• Review audit logs for filesystem operations performed by non-administrative users

How to Mitigate CVE-2022-1304

Immediate Actions Required

• Upgrade e2fsprogs to a patched version provided by your Linux distribution
• Avoid processing filesystem images from untrusted sources until patched
• Restrict access to e2fsprogs utilities to authorized administrators only
• Disable automatic filesystem checking on untrusted removable media

Patch Information

Organizations should apply vendor-provided security updates for e2fsprogs. Multiple vendors have released patches addressing this vulnerability:

• Red Hat has acknowledged this issue and tracked it in their bug tracking system
• Debian has released updates as documented in their LTS Announcement
• NetApp has published guidance in their Security Advisory

Check your distribution's package manager for available updates to e2fsprogs and apply them promptly.

Workarounds

• Implement strict access controls to prevent unauthorized users from running e2fsprogs utilities
• Configure systems to avoid automatic execution of filesystem tools on removable media
• Use sandboxing or containerization when processing untrusted filesystem images
• Run e2fsprogs utilities with reduced privileges where possible

# Check current e2fsprogs version
e2fsck -V

# Update e2fsprogs on RHEL/CentOS/Fedora
sudo dnf update e2fsprogs

# Update e2fsprogs on Debian/Ubuntu
sudo apt update && sudo apt upgrade e2fsprogs

# Verify updated version after patching
e2fsck -V