CVE-2021-34297 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 BMP_Loader.dll library in affected applications lacks proper validation of user-supplied data when parsing BMP 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-13059)
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Analysis
by VulDB Data Team • 07/16/2021
This vulnerability exists in JT2Go and Teamcenter Visualization software versions prior to V13.2 where the BMP_Loader.dll component fails to properly validate user-supplied data during BMP file parsing operations. The flaw manifests as an out-of-bounds write condition that occurs when the library processes malformed BMP image files, allowing an attacker to manipulate memory layout and potentially execute arbitrary code within the context of the running application process. The vulnerability represents a critical security risk that could be exploited by adversaries who gain the ability to upload or otherwise influence the processing of BMP files within these applications.
The technical implementation of this vulnerability stems from insufficient input validation within the BMP file parsing logic of the affected DLL library. When the BMP_Loader.dll processes a specially crafted BMP file, it fails to properly bounds-check array accesses or validate structure sizes, leading to memory corruption that can be leveraged for code execution. This type of vulnerability falls under the category of memory safety issues and aligns with CWE-121, which describes heap-based buffer overflow conditions. The out-of-bounds write occurs past the end of an allocated memory structure, making it particularly dangerous as it can overwrite adjacent memory locations including function pointers or return addresses that could be manipulated to redirect execution flow.
The operational impact of this vulnerability is significant as it enables remote code execution attacks against systems running affected versions of JT2Go or Teamcenter Visualization. Attackers could exploit this weakness by delivering malicious BMP files through various attack vectors such as email attachments, web downloads, or file sharing mechanisms where these applications are used to process images. The vulnerability is particularly concerning because it operates within the context of the current process, meaning successful exploitation could lead to full system compromise depending on the privileges of the affected application. This aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where an attacker could execute malicious code through compromised applications. The vulnerability affects organizations that rely on these visualization tools for engineering and design work, where image files are commonly processed and shared within collaborative environments.
Mitigation strategies for this vulnerability should prioritize immediate software updates to versions V13.2 or later where the issue has been addressed through proper bounds checking and input validation. Organizations should implement network segmentation and access controls to limit exposure of affected systems to untrusted file sources, particularly in environments where these applications process user-uploaded content. Security monitoring should be enhanced to detect unusual file processing activities or attempts to access BMP files through the vulnerable applications. Additionally, application whitelisting policies can help prevent execution of unauthorized binaries that might attempt to exploit similar vulnerabilities. System administrators should also consider implementing sandboxing techniques for image processing operations to contain potential exploitation attempts and reduce the attack surface for privilege escalation. The fix implemented by the vendor typically involves strengthening input validation mechanisms and adding proper bounds checking to prevent memory corruption during BMP file parsing operations, which directly addresses the root cause of the out-of-bounds write condition.