CVE-2015-5909 in Xcode
Summary
by MITRE
IDE Xcode Server in Apple Xcode before 7.0 does not properly restrict access to repository e-mail lists, which allows remote attackers to obtain potentially sensitive build information in opportunistic circumstances by leveraging incorrect notification delivery.
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Analysis
by VulDB Data Team • 06/16/2022
The vulnerability identified as CVE-2015-5909 resides within Apple Xcode Server's implementation of repository email list access controls, specifically affecting versions prior to Xcode 7.0. This flaw represents a significant security oversight in the code management and build automation infrastructure that developers rely upon for continuous integration processes. The issue manifests when Xcode Server fails to properly validate access permissions for repository email notifications, creating an opportunity for unauthorized parties to gain access to sensitive build information through what appears to be an innocuous delivery mechanism.
The technical root cause of this vulnerability stems from inadequate input validation and access control mechanisms within the email notification system of Xcode Server. When repository changes trigger build processes, the system generates email notifications that should only be accessible to authorized team members with appropriate repository permissions. However, the flawed implementation allows remote attackers to exploit misconfigured notification delivery systems, enabling them to intercept or access email lists that contain sensitive build metadata, including project configurations, build artifacts, and potentially intellectual property related to development workflows.
This vulnerability operates under the purview of CWE-284, which addresses improper access control issues in software systems. The flaw creates an opportunistic attack vector where adversaries can leverage existing notification infrastructure rather than targeting the core build system directly. Attackers can potentially gather sensitive information about ongoing development projects, including build schedules, source code structures, and development timelines that could inform more sophisticated attacks against the development environment or target applications.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can facilitate more advanced attack scenarios within the development ecosystem. Security researchers have noted that such access to build information can enable attackers to identify potential attack surfaces, understand project dependencies, and potentially discover other vulnerabilities within the development pipeline. The opportunistic nature of the exploit means that attackers do not need to possess specific credentials or directly compromise the system, but can instead exploit misconfigurations in the notification delivery process to gather intelligence about the development environment.
Organizations utilizing Xcode Server prior to version 7.0 face significant risk from this vulnerability, particularly those with sensitive projects or those operating in competitive environments where development information disclosure could provide adversaries with strategic advantages. The vulnerability is particularly concerning in enterprise environments where multiple teams collaborate on projects, as it could potentially expose information across different security domains within the same organization. Security professionals should consider this vulnerability as part of broader threat modeling exercises, especially when evaluating the security posture of development environments and continuous integration systems.
The recommended mitigation strategy involves upgrading to Apple Xcode 7.0 or later versions, which contain fixed access control mechanisms for repository email notifications. Additionally, organizations should implement network segmentation and monitoring of email delivery systems to detect anomalous access patterns. Security controls should include regular review of notification configurations and implementation of access controls that adhere to the principle of least privilege. Organizations should also consider implementing network-based intrusion detection systems that can monitor for suspicious email delivery patterns and alert security teams to potential exploitation attempts. The vulnerability serves as a reminder of the importance of proper access control implementation in development tools, particularly those that handle sensitive project information and facilitate automated build processes.