CVE-2022-1355: Libtiff Buffer Overflow Vulnerability

CVE-2022-1355 Overview

A stack buffer overflow vulnerability was discovered in LibTIFF's tiffcp.c file within the main() function. This flaw allows an attacker to pass a specially crafted TIFF file to the tiffcp command-line tool, triggering a stack buffer overflow that can corrupt memory and cause the application to crash, resulting in a denial of service condition.

Critical Impact

Attackers can exploit this vulnerability by providing malicious TIFF files to the tiffcp utility, potentially causing application crashes and denial of service on systems that process untrusted TIFF images.

Affected Products

• LibTIFF (all vulnerable versions)
• Fedora 34, 35, 36
• Red Hat Enterprise Linux 7.0, 8.0, 9.0
• NetApp ONTAP Select Deploy Administration Utility
• Debian Linux 10.0, 11.0

Discovery Timeline

• August 31, 2022 - CVE-2022-1355 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-1355

Vulnerability Analysis

This vulnerability is classified as a stack buffer overflow (CWE-121) and improper restriction of operations within the bounds of a memory buffer (CWE-119). The flaw resides in LibTIFF's tiffcp utility, a command-line tool used for copying and converting TIFF files. When processing a maliciously crafted TIFF file, the main() function in tiffcp.c fails to properly validate input boundaries, leading to a stack-based buffer overflow condition.

The attack requires local access and user interaction, as an attacker must convince a user to process a malicious TIFF file using the tiffcp tool. While the vulnerability does not allow direct code execution based on the current analysis, it can corrupt memory and cause the application to crash, leading to denial of service. In certain configurations, memory corruption vulnerabilities of this nature could potentially be leveraged for more severe attacks.

Root Cause

The root cause of this vulnerability is improper bounds checking in the main() function of tiffcp.c. When processing TIFF file metadata and image data, the code writes data to a stack-allocated buffer without adequately verifying that the data fits within the buffer's allocated size. This allows specially crafted TIFF files with oversized or malformed data fields to overflow the buffer, overwriting adjacent stack memory.

Attack Vector

The attack vector is local and requires user interaction. An attacker must craft a malicious TIFF file designed to exploit the buffer overflow condition and then convince a victim to process the file using the tiffcp command-line utility. Attack scenarios include:

• Distributing malicious TIFF files via email attachments
• Hosting malicious TIFF files on websites for download
• Placing malicious files in shared directories or network shares
• Compromising image processing pipelines that use tiffcp for automated TIFF conversion

When the victim executes tiffcp against the malicious file, the overflow occurs during file parsing, corrupting the stack and causing a crash. The vulnerability primarily results in denial of service through application crashes, though memory corruption could potentially be leveraged for additional exploitation in certain environments.

Detection Methods for CVE-2022-1355

Indicators of Compromise

• Unexpected crashes or core dumps from the tiffcp utility or applications using LibTIFF
• Presence of unusually large or malformed TIFF files in processing queues or user directories
• Log entries indicating segmentation faults or memory access violations in LibTIFF-dependent processes

Detection Strategies

• Monitor system logs for crash reports involving tiffcp or LibTIFF library functions
• Implement file integrity monitoring on directories where TIFF files are processed
• Deploy application-level monitoring to detect abnormal termination of image processing utilities
• Use memory corruption detection tools such as AddressSanitizer during development and testing

Monitoring Recommendations

• Enable core dump collection and analysis for LibTIFF-dependent applications
• Configure system auditing to log execution of tiffcp and related TIFF processing tools
• Implement alerting on repeated crashes of image processing services
• Review incoming TIFF files for anomalous characteristics before processing in production environments

How to Mitigate CVE-2022-1355

Immediate Actions Required

• Update LibTIFF to the latest patched version available from your distribution
• Restrict execution of tiffcp to trusted users and trusted input files only
• Implement input validation for TIFF files before processing with tiffcp
• Consider using containerization or sandboxing for image processing utilities

Patch Information

The LibTIFF project has addressed this vulnerability through GitLab Merge Request #323. Users should update to patched versions provided by their respective distributions. Major distributions have released security updates:

• Red Hat: Security advisory available at Red Hat CVE-2022-1355 Advisory
• Debian: Updates available via DSA-5333 and Debian LTS Advisory
• Gentoo: Updates available via GLSA 202210-10
• NetApp: Advisory available at NTAP-20221014-0007

Workarounds

• Avoid processing TIFF files from untrusted sources using tiffcp until patching is complete
• Implement file type validation and sanitization before processing TIFF files
• Run tiffcp in a restricted environment such as a container with limited privileges
• Use alternative TIFF processing tools that are not affected by this vulnerability

# Example: Update LibTIFF on Debian/Ubuntu systems
sudo apt update
sudo apt upgrade libtiff-tools libtiff5

# Example: Update LibTIFF on Red Hat/CentOS systems
sudo yum update libtiff libtiff-tools

# Example: Verify installed LibTIFF version
tiffcp -v 2>&1 | head -1