CVE-2011-4181 in Open Build Service
Summary
by MITRE
A vulnerability in open build service allows remote attackers to gain access to source files even though source access is disabled. Affected releases are SUSE open build service up to and including version 2.1.15 (for 2.1) and before version 2.3.
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Analysis
by VulDB Data Team • 03/22/2023
The vulnerability identified as CVE-2011-4181 represents a critical access control flaw within the SUSE Open Build Service platform, a distributed software build system designed to automate the creation of software packages across multiple operating systems and architectures. This vulnerability specifically targets the permission model implemented within the service, where source file access controls are supposed to prevent unauthorized users from accessing sensitive source code repositories. The flaw exists in versions of the Open Build Service up to and including version 2.1.15, affecting the 2.1 release line, and persists until version 2.3 is deployed. The issue manifests when the system fails to properly enforce source access restrictions, creating a path for remote attackers to bypass intended security controls and obtain access to source files that should remain restricted.
The technical implementation of this vulnerability stems from inadequate input validation and access control enforcement mechanisms within the Open Build Service's authentication and authorization framework. When users attempt to access source files through the web interface or API endpoints, the system fails to properly verify whether the requesting user possesses the necessary permissions to access the specific source repository in question. This represents a classic privilege escalation vulnerability where an attacker can manipulate the access control checks to gain unauthorized access to source code. The flaw likely involves improper handling of user session data, insufficient validation of access tokens, or flawed logic in the permission checking routines that govern source file access. According to CWE classification, this vulnerability maps to CWE-284 Access Control Issues, specifically involving improper access control mechanisms that allow unauthorized access to protected resources.
The operational impact of CVE-2011-4181 extends far beyond simple information disclosure, as source code access provides attackers with detailed insights into software development processes, implementation strategies, and potentially sensitive business logic. An attacker who successfully exploits this vulnerability can access proprietary source code, development methodologies, and potentially identify additional security weaknesses within the software development pipeline. This access could enable more sophisticated attacks including supply chain compromises, where attackers might modify source code before compilation, or exploitation of development-specific vulnerabilities that may not exist in production releases. The vulnerability affects organizations using SUSE Open Build Service for software development and distribution, potentially exposing intellectual property and creating opportunities for competitive disadvantage or malicious exploitation. From an ATT&CK framework perspective, this vulnerability aligns with techniques involving privilege escalation and credential access, enabling adversaries to move laterally within development environments and potentially compromise the entire software supply chain.
Mitigation strategies for this vulnerability require immediate deployment of the patched version 2.3 of the SUSE Open Build Service, which includes corrected access control mechanisms and proper validation of user permissions for source file access. Organizations should also implement additional security measures including regular access control audits, monitoring for unauthorized access attempts, and ensuring that all users have appropriate least privilege permissions. Network segmentation and firewall rules should be implemented to limit access to the Open Build Service to authorized development environments only. Security teams should conduct comprehensive vulnerability assessments of their software development infrastructure to identify similar access control weaknesses in other systems. The vulnerability demonstrates the critical importance of proper access control implementation in development platforms, as these systems often contain sensitive information that could be exploited for broader security compromises. Organizations should also consider implementing automated security scanning tools that can detect similar access control flaws in their software development environments and ensure that all security patches are applied promptly to maintain the integrity of their software supply chain processes.