CVE-2021-31343 in Solid Edge
Summary
by MITRE • 06/09/2021
The jutil.dll library in all versions of Solid Edge SE2020 before 2020MP14 and all versions of Solid Edge SE2021 before SE2021MP5 lack proper validation of user-supplied data when parsing DFT files. This could result in an out-of-bounds write past the end of an allocation structure. An attacker could leverage this vulnerability to execute code in the context of the current process.
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Analysis
by VulDB Data Team • 06/11/2021
The vulnerability identified as CVE-2021-31343 resides within the jutil.dll library component of Siemens Solid Edge software versions prior to specific maintenance releases. This represents a critical security flaw that affects both Solid Edge SE2020 before 2020MP14 and Solid Edge SE2021 before SE2021MP5, creating a persistent risk across multiple software generations. The issue stems from inadequate input validation mechanisms during the parsing of DFT files, which are standard file formats used within the software for various engineering and design operations. The vulnerability manifests as an out-of-bounds write condition that occurs when the library processes malformed user-supplied data, leading to memory corruption that can be exploited by malicious actors.
The technical nature of this flaw aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of improper input validation that allows attackers to manipulate memory structures. When Solid Edge processes a specially crafted DFT file, the jutil.dll library fails to properly validate the size or content of data structures, resulting in memory writes that extend beyond allocated buffer boundaries. This memory corruption creates opportunities for arbitrary code execution within the context of the currently running process, effectively allowing attackers to gain elevated privileges and potentially compromise the entire system. The vulnerability is particularly concerning because it requires no elevated privileges to exploit, as it operates within the normal execution context of the application itself.
The operational impact of this vulnerability extends beyond simple code execution, creating significant risks for organizations that rely on Solid Edge for critical engineering and design work. Attackers could leverage this weakness to inject malicious code into design workflows, potentially compromising sensitive intellectual property or disrupting engineering processes. The vulnerability's exploitation requires only the ability to convince a user to open a malicious DFT file, making it particularly dangerous in environments where file sharing occurs frequently. From an attack perspective, this flaw maps to multiple ATT&CK techniques including T1059 for command and scripting interpreter execution and T1068 for local privilege escalation, as the exploitation occurs within the application's execution context without requiring additional attack vectors.
Mitigation strategies for CVE-2021-31343 should prioritize immediate patching of affected Solid Edge installations to the recommended maintenance releases that contain the necessary code fixes. Organizations should implement strict file validation policies and consider sandboxing mechanisms for processing untrusted DFT files to prevent exploitation attempts. Network segmentation and access controls should be reinforced to limit the potential impact of successful exploitation, while regular security assessments should verify that all Solid Edge installations are properly updated. Additionally, user education programs should emphasize the importance of only opening DFT files from trusted sources, as the vulnerability can be exploited through social engineering tactics that trick users into executing malicious files. The remediation process should include thorough testing of patched systems to ensure that legitimate functionality remains intact while addressing the memory corruption vulnerability that enables arbitrary code execution.