CVE-2023-3618 in LibTIFF
Summary
by MITRE • 07/12/2023
A flaw was found in libtiff. A specially crafted tiff file can lead to a segmentation fault due to a buffer overflow in the Fax3Encode function in libtiff/tif_fax3.c, resulting in a denial of service.
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Analysis
by VulDB Data Team • 04/25/2025
The vulnerability identified as CVE-2023-3618 represents a critical buffer overflow flaw within the libtiff library's Fax3Encode function located in the file tif_fax3.c. This issue arises from insufficient input validation when processing specially crafted TIFF files, creating a scenario where maliciously formatted data can trigger memory corruption. The flaw specifically manifests as a segmentation fault during the encoding process, which fundamentally disrupts the normal operation of applications relying on libtiff for image processing tasks. The vulnerability falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows attackers to write beyond allocated memory boundaries. This type of vulnerability is particularly dangerous in environments where libtiff is used to process untrusted input from network sources or file uploads, as it provides a clear path for remote code execution or system compromise through carefully constructed malicious files.
The operational impact of this vulnerability extends far beyond simple denial of service, as it creates potential attack vectors for sophisticated exploitation techniques. When applications utilizing libtiff encounter malformed TIFF files, the buffer overflow can cause unpredictable behavior including application crashes, memory corruption, or even complete system instability. The Fax3Encode function specifically handles fax compression algorithms, making this vulnerability particularly concerning for document management systems, scanning applications, and any software processing fax-related image data. Attackers can leverage this flaw by crafting TIFF files that contain malicious data structures designed to overflow the buffer during encoding operations, effectively triggering the segmentation fault. This vulnerability directly maps to ATT&CK technique T1203, which involves exploiting software vulnerabilities to gain unauthorized access or cause system disruption, and represents a classic example of how input validation failures can lead to critical system compromise.
Mitigation strategies for CVE-2023-3618 should prioritize immediate patching of affected libtiff versions, as the vulnerability exists in the core image processing library used by numerous applications across different platforms. Organizations must implement comprehensive input validation measures for all TIFF file processing workflows, including strict file format validation and size limitations to prevent exploitation. The recommended approach involves upgrading to patched versions of libtiff where the buffer overflow has been addressed through proper bounds checking and memory management practices. Network segmentation and application whitelisting can provide additional defense-in-depth measures, ensuring that only trusted applications can process TIFF files and limiting the potential impact of successful exploitation attempts. Security monitoring should include detection of unusual segmentation fault patterns and memory access violations that may indicate exploitation attempts. System administrators should also consider implementing automated vulnerability scanning tools that can identify systems running vulnerable versions of libtiff and prioritize remediation efforts based on risk assessment. The remediation process should include thorough testing of patched libraries to ensure compatibility with existing applications while maintaining the security improvements necessary to prevent exploitation of this critical buffer overflow vulnerability.