CVE-2018-7689 in Open Build Service
Summary
by MITRE
Lack of permission checks in the InitializeDevelPackage function in openSUSE Open Build Service before 2.9.3 allowed authenticated users to modify packages where they do not have write permissions.
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Analysis
by VulDB Data Team • 03/22/2023
The vulnerability identified as CVE-2018-7689 represents a critical authorization flaw within the openSUSE Open Build Service platform prior to version 2.9.3. This issue stems from insufficient permission validation mechanisms within the InitializeDevelPackage function, which is a core component responsible for managing package development workflows. The flaw specifically affects authenticated users who can exploit this vulnerability to manipulate packages they would normally not have write access to, fundamentally undermining the platform's access control model.
The technical implementation of this vulnerability resides in the InitializeDevelPackage function where proper authorization checks are either absent or inadequately implemented. This function typically handles the initialization of development packages within the build service environment, but due to missing permission verification logic, authenticated users can bypass normal access controls. The flaw allows for privilege escalation through unauthorized package modifications, potentially enabling malicious actors to inject malicious code, alter package metadata, or manipulate build processes. This represents a classic case of insufficient authorization checks that violates fundamental security principles of least privilege and access control enforcement.
The operational impact of CVE-2018-7689 extends beyond simple unauthorized access, creating significant risks for software supply chain integrity and system security. An authenticated attacker could leverage this vulnerability to modify packages in ways that compromise downstream systems, potentially affecting multiple users who depend on the build service for their software development workflows. The vulnerability particularly threatens organizations relying on openSUSE Open Build Service for managing software packages, as it could enable attackers to introduce backdoors, malware, or other malicious modifications that propagate through the build system. This risk is compounded by the fact that the vulnerability affects authenticated users, meaning that compromised accounts or insider threats could exploit this weakness.
From a cybersecurity framework perspective, this vulnerability maps directly to CWE-284 (Improper Access Control) and aligns with several ATT&CK techniques including privilege escalation and defense evasion. The flaw demonstrates poor implementation of access control mechanisms that should be enforced at the application level to prevent unauthorized modifications. Organizations using affected versions of openSUSE Open Build Service should prioritize immediate remediation through the available updates to version 2.9.3 or later, which implements proper authorization checks within the InitializeDevelPackage function. Additionally, security teams should conduct comprehensive audits of access controls within their build environments and consider implementing additional monitoring for unauthorized package modifications to detect potential exploitation attempts. The vulnerability underscores the critical importance of proper access control implementation in software development platforms where package integrity and security are paramount considerations.