CVE-2022-43702 in Compiler 5, Compiler 6, Compiler for Embedded, Compiler for Embedded FuSa, Compiler for Linux, Development Studio, Development Studio Morello Edition, Forge, Mobile Studio, DS-5 Development Studio, Fast Models, GNU Toolchain, Installer Vulnerabilities, Keil MDK, Socrates
Summary
by MITRE • 07/28/2023
When the directory containing the installer does not have sufficiently restrictive file permissions, an attacker can modify (or replace) the installer to execute malicious code.
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Analysis
by VulDB Data Team • 08/20/2023
This vulnerability represents a critical access control flaw that undermines the integrity of software installation processes. The issue manifests when installer files reside in directories with insufficiently restrictive file permissions, creating an attack vector where malicious actors can manipulate the installation workflow. The vulnerability is categorized under CWE-276 which specifically addresses incorrect permissions for critical resources, making it a fundamental weakness in the security model of software deployment systems. Attackers exploiting this vulnerability can substitute legitimate installer files with malicious counterparts, effectively executing arbitrary code during the installation process.
The technical mechanism of exploitation relies on the principle of least privilege being violated within the installation environment. When directory permissions are improperly configured, typically allowing write access to unauthorized users or groups, the attacker can replace the legitimate installer binary with a modified version. This modified installer can contain malicious payloads that execute with the privileges of the installation process, potentially elevating the attacker's privileges to system level access. The vulnerability is particularly dangerous because it operates at the installation phase, which is typically considered a trusted execution environment where users expect no malicious interference.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and persistent access. Successful exploitation can lead to privilege escalation, data exfiltration, and establishment of backdoors within the target system. The attack surface is broad as it affects any software installation process where directory permissions are not properly enforced, making it a widespread concern across enterprise environments. From an ATT&CK framework perspective, this vulnerability maps to T1059.001 (Command and Scripting Interpreter) and T1068 (Local Port Forwarding) as attackers can leverage the installed malicious code for further exploitation. The vulnerability also aligns with T1548.001 (Abuse Elevation Control Mechanism) since it allows attackers to bypass normal privilege control mechanisms.
Mitigation strategies must focus on implementing proper directory permission controls and establishing secure installation practices. Organizations should enforce restrictive permissions on installation directories, ensuring that only authorized administrators can modify installer files. The principle of least privilege must be strictly applied, with directory access controls limiting write permissions to specific user groups. Additionally, code signing verification should be implemented to validate installer integrity before execution. Regular security audits of installation environments can help identify and remediate permission misconfigurations. Implementing file integrity monitoring solutions can provide real-time detection of unauthorized installer modifications. Organizations should also consider implementing secure boot processes and trusted execution environments to prevent unauthorized code execution during installation phases. The vulnerability highlights the importance of defense in depth strategies where multiple layers of security controls work together to prevent successful exploitation attempts.