CVE-2021-34305 in JT2Go
Summary
by MITRE • 07/13/2021
A vulnerability has been identified in JT2Go (All versions < V13.2), Teamcenter Visualization (All versions < V13.2). The Gif_loader.dll library in affected applications lacks proper validation of user-supplied data when parsing GIF files. This could result in an out of bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-13340)
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Analysis
by VulDB Data Team • 07/16/2021
This vulnerability exists within the gif_loader.dll library component of JT2Go and Teamcenter Visualization applications, affecting all versions prior to V13.2. The flaw represents a critical security weakness that stems from insufficient input validation during GIF file parsing operations, creating a pathway for arbitrary code execution. The vulnerability manifests as an out-of-bounds write condition that occurs when the library processes malformed GIF data structures, specifically when handling user-supplied input that is not properly sanitized before being processed. This type of vulnerability falls under the category of buffer overflow conditions and is classified as CWE-121, which describes heap-based buffer overflow scenarios. The issue is particularly concerning because it operates at the core level of multimedia file processing, where applications must handle diverse and potentially malicious input formats from untrusted sources.
The technical exploitation of this vulnerability requires an attacker to craft a specially malformed GIF file that triggers the unsafe memory access pattern within the gif_loader.dll module. When the affected application processes this malicious file, the improper validation allows memory corruption to occur beyond the bounds of allocated structures, potentially overwriting adjacent memory locations. This memory corruption can be leveraged to redirect execution flow, enabling attackers to inject and execute arbitrary code within the application's security context. The attack vector is particularly dangerous because it requires no elevated privileges beyond normal user access, as the exploitation occurs within the context of the running application process. According to ATT&CK framework, this represents a code injection technique (T1059) that can be achieved through malicious file manipulation (T1068), potentially leading to privilege escalation or lateral movement within the compromised system.
The operational impact of this vulnerability extends beyond simple code execution capabilities, as it can lead to complete system compromise when combined with other attack vectors or when the affected applications run with elevated privileges. Applications using the vulnerable library may be exploited in targeted attacks against engineering and design environments where Teamcenter Visualization and JT2Go are commonly deployed, particularly in manufacturing and automotive industries. These environments often handle sensitive intellectual property and proprietary design data, making the potential impact of exploitation significantly higher than typical consumer applications. Organizations should implement immediate mitigations including patching to version V13.2 or later, implementing network-based restrictions on GIF file processing, and deploying application whitelisting controls to prevent execution of untrusted multimedia content. The vulnerability also highlights the importance of proper input validation and memory safety practices in multimedia processing libraries, as similar issues can be found in other file format parsers that lack adequate bounds checking mechanisms.