CVE-2006-3459 in libtiff
Summary
by MITRE
Multiple stack-based buffer overflows in the TIFF library (libtiff) before 3.8.2, as used in Adobe Reader 9.3.0 and other products, allow context-dependent attackers to execute arbitrary code or cause a denial of service via unspecified vectors, including a large tdir_count value in the TIFFFetchShortPair function in tif_dirread.c.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 01/02/2025
The vulnerability identified as CVE-2006-3459 represents a critical stack-based buffer overflow within the libtiff library version 3.8.1 and earlier, which was widely distributed and integrated into numerous commercial and open source applications including Adobe Reader 9.3.0. This flaw exists in the TIFFFetchShortPair function located in the tif_dirread.c source file, where the library fails to properly validate input parameters before processing them. The vulnerability is particularly concerning because it allows attackers to manipulate the tdir_count value, which controls the number of directory entries that the library attempts to read and process, leading to memory corruption when the value exceeds expected bounds. The flaw demonstrates a classic stack overflow condition where insufficient bounds checking enables attackers to overwrite adjacent stack memory locations, potentially allowing arbitrary code execution or system crashes.
The technical nature of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond the allocated buffer space. The exploitability of this flaw is context-dependent, meaning that attackers must craft specific malicious TIFF files that contain malformed directory entry counts to trigger the vulnerable code path. When the TIFF library processes such malformed input, the tdir_count parameter is used to determine how many short values to read from the directory, but without proper validation, the library continues to allocate stack space and read data beyond the intended buffer boundaries. This condition creates a scenario where attackers can manipulate the program execution flow by overwriting return addresses, function pointers, or other critical stack data structures. The vulnerability affects not just Adobe Reader but also numerous other applications that rely on the libtiff library for image processing, making the potential impact widespread across different software ecosystems.
From an operational perspective, this vulnerability presents significant risks to organizations that process untrusted TIFF files, particularly in environments where users can upload or receive image files from external sources. The potential for remote code execution means that attackers could compromise systems simply by enticing users to open maliciously crafted TIFF files, making this a particularly dangerous vulnerability for email attachments, web applications, or file sharing platforms. The denial of service aspect of this vulnerability can also be leveraged to disrupt operations, causing applications to crash or become unresponsive when processing the malformed files. Security analysts should note that this vulnerability was classified under the ATT&CK framework as part of the T1203 - Exploitation for Client Execution technique, where adversaries exploit vulnerabilities in software applications to execute malicious code on target systems. The impact extends beyond immediate exploitation to include potential privilege escalation scenarios where attackers could leverage the code execution capability to gain higher system privileges.
Mitigation strategies for CVE-2006-3459 should focus on immediate patching of the libtiff library to version 3.8.2 or later, which includes proper bounds checking and input validation for the tdir_count parameter. Organizations should also implement network-based and host-based security controls such as file type validation, content inspection, and sandboxing of TIFF file processing to prevent exploitation. Application developers should ensure that their applications properly validate all input parameters before passing them to library functions, implementing defensive programming practices that include bounds checking and input sanitization. Additionally, security monitoring should include detection of unusual file processing patterns or system crashes that could indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify any systems still running vulnerable versions of the library, while access control measures should limit user ability to process untrusted TIFF files without proper validation. The remediation process should also include updating all applications that depend on libtiff to ensure they are using patched versions of the library, as the vulnerability may be present in multiple software components across an organization's infrastructure.