CVE-2015-1318 in Apport
Summary
by MITRE
The crash reporting feature in Apport 2.13 through 2.17.x before 2.17.1 allows local users to gain privileges via a crafted usr/share/apport/apport file in a namespace (container).
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Analysis
by VulDB Data Team • 11/03/2025
The vulnerability identified as CVE-2015-1318 resides within the crash reporting functionality of Apport, a system component used primarily in Ubuntu and other debian-based distributions for collecting and reporting application crash information. This flaw affects versions of Apport ranging from 2.13 through 2.17.x before the release of 2.17.1, creating a persistent security weakness that could be exploited by local attackers to escalate privileges. The vulnerability specifically targets the handling of the usr/share/apport/apport file within Linux namespace containers, which are isolated execution environments that provide process and resource isolation. The issue demonstrates how seemingly benign system utilities can become attack vectors when proper privilege management and file validation mechanisms are absent.
The technical exploitation of this vulnerability occurs through a carefully crafted apport file that leverages the namespace container environment to bypass normal privilege checks. When Apport processes crash reports within a containerized namespace, the system fails to properly validate the file permissions and execution context of the apport file. This allows a local user to manipulate the file in such a way that when the crash reporting system executes it, the code runs with elevated privileges rather than the restricted user context. The flaw operates under the principle of privilege escalation through improper access control, where the system does not adequately verify the integrity or ownership of files within the namespace environment. This represents a classic case of insufficient privilege separation between user-level processes and system-level operations.
The operational impact of CVE-2015-1318 extends beyond simple privilege escalation as it provides attackers with a persistent mechanism to gain elevated system access. Once successfully exploited, the vulnerability enables attackers to execute arbitrary code with root privileges, potentially leading to complete system compromise. The vulnerability is particularly concerning in containerized environments where multiple users or applications may be running within isolated namespaces, as it allows for privilege escalation across these boundaries. This flaw undermines the fundamental security model of namespace isolation and could be leveraged to establish persistent backdoors or to access sensitive system resources. The impact is further amplified because the vulnerability exists within a core system utility that is designed to run with elevated privileges, making the exploitation path more direct and the potential consequences more severe.
Mitigation strategies for CVE-2015-1318 focus on updating to the patched version of Apport 2.17.1 or later, which includes proper validation mechanisms for file handling within namespace containers. System administrators should also implement strict file permission controls on the usr/share/apport directory and its contents, ensuring that only authorized processes can modify these critical system files. The vulnerability aligns with CWE-276, which addresses improper file permissions, and represents a specific case of privilege escalation through inadequate access control. From an operational security perspective, organizations should monitor for the presence of vulnerable Apport versions and implement automated patch management systems to ensure timely remediation. Additionally, the use of containerization technologies should include proper isolation controls and privilege management to prevent exploitation of similar namespace-based vulnerabilities. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the use of system utilities for unauthorized access, highlighting the importance of maintaining proper system integrity checks and access controls.