CVE-2018-3868 in PhotoLine
Summary
by MITRE
A specially crafted TIFF image processed via the application can lead to an out-of-bounds write, overwriting arbitrary data. An attacker can deliver a TIFF image to trigger this vulnerability and gain code execution.
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Analysis
by VulDB Data Team • 02/28/2023
The vulnerability identified as CVE-2018-3868 represents a critical out-of-bounds write flaw in image processing libraries that handle TIFF format files. This vulnerability stems from insufficient input validation and boundary checking within the parsing mechanism of TIFF image files, specifically affecting applications that utilize vulnerable libraries for image rendering and processing. The flaw manifests when the application encounters a malformed TIFF image containing crafted data structures that exceed expected buffer boundaries during the parsing process.
The technical implementation of this vulnerability involves the manipulation of TIFF file headers and metadata fields that control the allocation and interpretation of memory buffers. When the vulnerable application processes a specially crafted TIFF image, it fails to properly validate the size parameters specified in the image file's structure, particularly within the IFD (Image File Directory) entries and their associated data offsets. This inadequate validation allows an attacker to construct a TIFF file where the calculated buffer sizes exceed the allocated memory boundaries, resulting in memory corruption that can be exploited to overwrite adjacent memory locations.
The operational impact of this vulnerability extends beyond simple memory corruption, as it provides attackers with a pathway to achieve arbitrary code execution within the context of the vulnerable application. The out-of-bounds write condition creates a predictable memory layout that can be manipulated to overwrite critical program data structures, function pointers, or return addresses, enabling attackers to redirect execution flow and inject malicious code. This vulnerability is particularly concerning in environments where applications process untrusted image files from web browsers, email attachments, or file sharing platforms, as it can be exploited through automated delivery mechanisms.
Security professionals should recognize this vulnerability as a variant of CWE-121, which specifically addresses stack-based buffer overflow conditions, and potentially related to CWE-787, which covers out-of-bounds writes in heap-based memory structures. The exploitability characteristics align with ATT&CK technique T1059.007 for command and scripting interpreter, where attackers may leverage the code execution capability to establish persistent access or escalate privileges. The vulnerability demonstrates a clear path from initial exploitation to potential system compromise, making it a high-priority target for remediation efforts in enterprise environments.
Mitigation strategies for CVE-2018-3868 should focus on immediate library updates and patches from vendors, alongside defensive programming practices such as implementing stricter input validation and bounds checking in image processing routines. Organizations should deploy network segmentation and application whitelisting to limit exposure, while also implementing robust input sanitization for all image file processing operations. The vulnerability underscores the importance of comprehensive security testing for multimedia processing components and highlights the need for regular vulnerability assessments targeting third-party libraries that handle file format parsing operations.