CVE-2012-3401 in LibTIFF
Summary
by MITRE
The t2p_read_tiff_init function in tiff2pdf (tools/tiff2pdf.c) in LibTIFF 4.0.2 and earlier does not properly initialize the T2P context struct pointer in certain error conditions, which allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted TIFF image that triggers a heap-based buffer overflow.
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Analysis
by VulDB Data Team • 12/07/2021
The vulnerability identified as CVE-2012-3401 resides within the LibTIFF library version 4.0.2 and earlier, specifically within the tiff2pdf utility's t2p_read_tiff_init function. This flaw represents a critical security issue that demonstrates poor memory management practices and inadequate error handling within the TIFF to PDF conversion process. The vulnerability occurs when the function fails to properly initialize a T2P context structure pointer under specific error conditions, creating a dangerous state where uninitialized memory pointers can be dereferenced during subsequent operations.
The technical exploitation of this vulnerability involves a heap-based buffer overflow scenario that arises from improper memory initialization. When a maliciously crafted TIFF image is processed by the tiff2pdf utility, the uninitialized T2P context pointer can lead to unpredictable memory access patterns. This condition creates a situation where attackers can manipulate the memory layout to cause either a denial of service through application crashes or potentially achieve arbitrary code execution. The root cause aligns with CWE-457: Use of Uninitialized Variable, which specifically addresses scenarios where variables are used without proper initialization, leading to undefined behavior and potential security exploits.
The operational impact of this vulnerability extends beyond simple service disruption to encompass potential system compromise. When exploited, the vulnerability can cause the tiff2pdf utility to crash, resulting in denial of service for legitimate users who rely on this tool for document conversion. However, the more concerning aspect involves the potential for arbitrary code execution, which could allow attackers to gain control over systems running vulnerable versions of LibTIFF. This vulnerability particularly affects systems that process untrusted TIFF files through the tiff2pdf utility, making it a significant concern for document processing servers, automated conversion systems, and any environment where TIFF file handling occurs.
The exploitation pathway follows ATT&CK technique T1203: Exploitation for Client Execution, where attackers craft malicious TIFF files to trigger the uninitialized pointer dereference. This vulnerability also aligns with ATT&CK technique T1059: Command and Scripting Interpreter, as successful exploitation could enable attackers to execute arbitrary commands on the affected system. The attack surface is particularly broad given that LibTIFF is widely used across various applications and operating systems, making it a prime target for exploitation. Organizations using vulnerable versions of LibTIFF should consider implementing input validation, sandboxing of document processing, and immediate patching of affected systems to prevent exploitation.
Mitigation strategies for this vulnerability require immediate attention through patching the LibTIFF library to version 4.0.3 or later, which contains the necessary fixes for the uninitialized pointer issue. Additionally, organizations should implement strict input validation for TIFF files, particularly when processing untrusted content through tiff2pdf or other LibTIFF-dependent utilities. Network segmentation and access controls can help limit the potential impact of exploitation, while monitoring systems should be configured to detect unusual patterns in document processing activities. The fix implemented in subsequent versions addresses the core issue by ensuring proper initialization of the T2P context pointer before any operations that might dereference it, thereby preventing the heap-based buffer overflow condition that enabled the vulnerability.