CVE-2021-34331 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 Jt981.dll library in affected applications lacks proper validation of user-supplied data when parsing JT 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-13442)
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Analysis
by VulDB Data Team • 07/16/2021
The vulnerability identified as CVE-2021-34331 represents a critical security flaw affecting JT2Go and Teamcenter Visualization applications across all versions prior to V13.2. This issue resides within the Jt981.dll library which is responsible for processing JT files, a proprietary format used for 3D product data exchange in engineering and manufacturing environments. The vulnerability stems from insufficient input validation mechanisms that fail to properly sanitize user-supplied data during the parsing process, creating a dangerous condition that can be exploited by malicious actors.
The technical implementation of this vulnerability manifests as an out-of-bounds write condition that occurs when the Jt981.dll library processes malformed JT files. When the application encounters specially crafted input data, the parsing routine fails to validate the boundaries of allocated memory structures, allowing subsequent write operations to overwrite adjacent memory locations beyond the intended buffer limits. This type of vulnerability falls under the CWE-121 category of 'Stack-based Buffer Overflow' and more specifically aligns with CWE-787 'Out-of-bounds Write' as defined in the Common Weakness Enumeration catalog. The flaw represents a classic memory corruption vulnerability that can be leveraged for arbitrary code execution.
The operational impact of this vulnerability is significant within industrial and engineering environments where these applications are commonly deployed. Attackers who successfully exploit this vulnerability can execute malicious code with the privileges of the currently running process, potentially leading to complete system compromise. The attack vector requires the victim to open a maliciously crafted JT file, which makes this vulnerability particularly dangerous in environments where users frequently exchange 3D design data or receive files from external sources. This vulnerability directly maps to the ATT&CK technique T1059.007 'Command and Scripting Interpreter: PowerShell' and T1203 'Exploitation for Client Execution' within the MITRE ATT&CK framework, as it enables attackers to gain remote code execution capabilities through legitimate application interfaces.
Organizations affected by this vulnerability should immediately implement mitigations including updating to version 13.2 or later of JT2Go and Teamcenter Visualization, which contain the necessary patches to address the input validation deficiencies. Additionally, administrators should consider implementing restrictive file access controls and network segmentation to limit exposure, while monitoring for suspicious file execution patterns. The vulnerability also highlights the importance of input validation in industrial software systems, particularly those handling complex data formats, and serves as a reminder of the critical need for secure coding practices in engineering and visualization applications. Security teams should also consider implementing application whitelisting policies and user education programs to reduce the risk of successful exploitation through social engineering or malicious file delivery attacks.