CVE-2022-0924: Libtiff Out-of-Bounds Read DOS Vulnerability

CVE-2022-0924 Overview

CVE-2022-0924 is an Out-of-bounds Read vulnerability affecting the tiffcp utility in libtiff version 4.3.0. This memory corruption flaw allows attackers to cause a denial-of-service condition by processing a specially crafted TIFF file. The vulnerability stems from improper boundary checks when handling TIFF image data, leading to reads beyond allocated memory regions.

Critical Impact

Attackers can crash applications using libtiff by supplying maliciously crafted TIFF files, causing service disruption in image processing pipelines and applications that rely on the library.

Affected Products

• libtiff 4.3.0
• Debian Linux 10.0 and 11.0
• Fedora 35 and 36
• NetApp ONTAP Select Deploy Administration Utility

Discovery Timeline

• 2022-03-11 - CVE-2022-0924 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-0924

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-bounds Read), a memory safety issue that occurs when the tiffcp utility reads data from a location outside the intended buffer boundaries. When processing malformed TIFF files, the application fails to properly validate input boundaries before accessing memory, resulting in reading data from unintended memory locations.

The attack requires local access and user interaction, meaning an attacker must convince a user to process a malicious TIFF file using the vulnerable tiffcp utility or an application that incorporates the affected libtiff library. While this vulnerability does not lead to code execution or data modification, the out-of-bounds read can cause application crashes, resulting in denial of service for systems that process untrusted TIFF images.

Root Cause

The root cause lies in insufficient bounds checking within the tiffcp utility when parsing TIFF file structures. When the utility encounters specially crafted TIFF metadata or image data sections, it fails to validate that the requested read operations remain within the bounds of allocated memory buffers. This oversight allows memory reads to extend beyond the legitimate data boundaries, triggering memory access violations and application crashes.

Attack Vector

The attack vector is local with required user interaction. An attacker must craft a malicious TIFF file containing manipulated headers or data structures designed to trigger the out-of-bounds read condition. The attack succeeds when a victim processes this file using tiffcp or applications linked against the vulnerable libtiff library. The crafted file exploits the missing boundary validation to cause reads into invalid memory regions, leading to application termination.

The vulnerability affects systems that process TIFF images from untrusted sources, including document processing systems, image conversion utilities, and web applications that accept user-uploaded images in TIFF format.

Detection Methods for CVE-2022-0924

Indicators of Compromise

• Unexpected crashes of tiffcp or applications using libtiff when processing TIFF files
• Segmentation fault errors in system logs associated with libtiff operations
• Memory access violation errors during TIFF file processing operations

Detection Strategies

• Monitor for process crashes involving tiffcp or libtiff-dependent applications with memory access error signatures
• Implement file integrity monitoring for TIFF files in upload directories to detect potentially malicious files
• Deploy static analysis scanning to identify libtiff version 4.3.0 installations across the environment

Monitoring Recommendations

• Enable crash dump collection for applications using libtiff to identify exploitation attempts
• Monitor system logs for repeated segmentation faults associated with image processing services
• Track libtiff library versions across systems using software inventory tools to ensure timely patching

How to Mitigate CVE-2022-0924

Immediate Actions Required

• Update libtiff to a patched version incorporating commit 408976c4 or later
• Apply security updates from your Linux distribution (Debian DSA-5108, Fedora, or Gentoo GLSA 202210-10)
• Review and restrict processing of untrusted TIFF files until patches are applied

Patch Information

The fix is available in commit 408976c4 for users compiling libtiff from source. For distribution packages, apply the relevant security updates:

• Debian: Install updates from DSA-5108
• Fedora: Update via official package announcements for Fedora 35 and 36
• Gentoo: Apply GLSA 202210-10
• NetApp: Refer to NetApp Security Advisory

The official merge request with the fix is available at GitLab Merge Request #311.

Workarounds

• Restrict tiffcp and libtiff-dependent applications from processing files from untrusted sources
• Implement input validation and sandboxing for TIFF file processing workflows
• Use alternative image processing libraries for untrusted content until patching is complete

# Check current libtiff version
tiffcp -v 2>&1 | head -1

# For Debian/Ubuntu systems, update libtiff
sudo apt update && sudo apt upgrade libtiff-tools libtiff5

# For Fedora systems
sudo dnf update libtiff