CVE-2018-15809 in AccuPOS
Summary
by MITRE
AccuPOS 2017.8 is installed with the insecure "Authenticated Users: Modify" permission for files within the installation path. This may allow local attackers to compromise the integrity of critical resource and executable files.
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Analysis
by VulDB Data Team • 03/17/2020
CVE-2018-15809 represents a critical privilege escalation vulnerability within AccuPOS 2017.8 software that stems from improper access control configuration. The vulnerability manifests when the installation process grants the "Authenticated Users: Modify" permission to critical files within the application's installation directory. This misconfiguration allows any authenticated user on the system to modify or replace executable files and other critical resources, fundamentally undermining the integrity of the software ecosystem. The flaw directly maps to CWE-276, which addresses incorrect permissions for critical resources, and specifically aligns with CWE-732, which covers inadequate permissions for critical resources. From an operational perspective, this vulnerability creates a significant attack surface that can be exploited by adversaries with minimal privileges to gain deeper system access or execute malicious code.
The technical implementation of this vulnerability exploits the fundamental principle of least privilege by granting unnecessary write permissions to files that should typically be restricted to administrators or system processes only. When authenticated users possess modify permissions on critical executables, they can substitute legitimate binaries with malicious counterparts, potentially leading to arbitrary code execution or complete system compromise. This type of vulnerability falls under the ATT&CK framework category of privilege escalation, specifically targeting the T1068 technique for local privilege escalation. The impact extends beyond simple file modification as attackers can leverage this access to alter configuration files, inject malicious code into legitimate processes, or establish persistent backdoors within the system.
The operational implications of CVE-2018-15809 are particularly severe in enterprise environments where AccuPOS systems handle sensitive financial transactions and customer data. Attackers with basic user accounts can exploit this vulnerability to manipulate transaction processing, alter financial records, or redirect system functionality to malicious endpoints. The vulnerability is especially concerning because it requires no special privileges beyond basic authentication, making it accessible to anyone with legitimate user credentials. Organizations utilizing AccuPOS software are at heightened risk of data integrity compromise, financial fraud, and system availability attacks. The vulnerability also creates opportunities for lateral movement within networks, as compromised AccuPOS systems can serve as launching points for attacks on other network resources.
Mitigation strategies for CVE-2018-15809 should focus on immediate permission adjustments and long-term system hardening measures. System administrators must immediately review and restrict file permissions on the AccuPOS installation directory, ensuring that only authorized personnel or system processes possess modify privileges. The recommended approach involves implementing the principle of least privilege by revoking unnecessary permissions and establishing proper access controls for each file type within the installation path. Organizations should also consider applying the latest security patches from AccuPOS vendor releases and implementing file integrity monitoring solutions to detect unauthorized modifications. Additionally, network segmentation and access control policies should be enforced to limit user access to critical systems and reduce the potential impact of such vulnerabilities. Regular security audits and privileged access management solutions can further mitigate the risk of exploitation by ensuring that only necessary users have access to critical system resources.