CVE-2015-8697 in stalin
Summary
by MITRE
stalin 0.11-5 allows local users to write to arbitrary files.
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Analysis
by VulDB Data Team • 10/20/2019
The vulnerability identified as CVE-2015-8697 affects the stalin package version 0.11-5 and represents a critical local privilege escalation flaw that enables unauthorized file system modifications. This issue stems from inadequate input validation and file handling mechanisms within the software's execution environment, creating a pathway for malicious local users to manipulate arbitrary files on the system. The vulnerability specifically targets the package management or installation process where stalin fails to properly sanitize file paths or verify write permissions before executing file operations. This flaw operates under the broader category of insecure file handling practices that are commonly classified under CWE-73, which addresses "External Control of File Name or Path" and falls within the ATT&CK framework's technique T1059 for executing malicious code through local system interactions. The security implications extend beyond simple file modification as this vulnerability can be leveraged to overwrite critical system files, inject malicious code into legitimate programs, or establish persistent backdoors within the target environment. Attackers exploiting this vulnerability can manipulate the stalin package's behavior to gain elevated privileges or compromise the integrity of the entire system.
The technical exploitation of CVE-2015-8697 occurs when local users can manipulate the stalin package's file operations through insufficient validation of file paths or directory traversal sequences. The vulnerability typically manifests during package installation, update, or execution phases where the software performs file operations without proper authorization checks or path sanitization. This flaw allows attackers to specify arbitrary file paths that the software will attempt to write to, potentially overwriting system binaries, configuration files, or other critical components. The underlying mechanism often involves improper handling of temporary files, symbolic links, or directory permissions that enable attackers to redirect file operations to unintended locations. Security researchers have identified this pattern as a common vulnerability in package management systems where insufficient input validation creates opportunities for privilege escalation attacks. The flaw can be particularly dangerous in multi-user environments where local users might not have direct write permissions to system directories but can exploit this vulnerability to gain unauthorized access to sensitive file systems.
The operational impact of CVE-2015-8697 extends far beyond immediate file system corruption, as it provides a foundation for more sophisticated attack vectors that can compromise entire system infrastructures. Local users who exploit this vulnerability can potentially modify critical system files, install malicious software, or establish persistent access mechanisms that persist across system reboots. The vulnerability's exploitation can lead to complete system compromise, especially when combined with other local privilege escalation techniques or when the stalin package is used in conjunction with other vulnerable components within the same system. Organizations running affected systems face significant risks including data integrity breaches, unauthorized access to sensitive information, and potential lateral movement within their network infrastructure. The vulnerability also impacts system availability as attackers can overwrite essential binaries or configuration files, leading to system instability or complete service outages. Furthermore, the flaw can be exploited to undermine the integrity of software supply chains, particularly in environments where the stalin package is used for system administration or automated deployment processes.
Mitigation strategies for CVE-2015-8697 require immediate patching and implementation of comprehensive file system security controls. Organizations should prioritize updating to patched versions of the stalin package where available, as this represents the most direct solution to address the vulnerability. System administrators must implement proper file permission controls and ensure that the stalin package operates with minimal required privileges to reduce the potential impact of exploitation. Additional protective measures include implementing file integrity monitoring systems that can detect unauthorized file modifications, establishing strict input validation procedures for all file operations, and conducting regular security audits of package management systems. The implementation of principle of least privilege should be enforced across all system components that interact with the stalin package, ensuring that file operations are restricted to only necessary directories and files. Network segmentation and access controls should be deployed to limit local user access to critical system components, while regular system scans should be conducted to identify any potential exploitation attempts. Security teams should also consider implementing behavioral monitoring systems that can detect anomalous file access patterns or unauthorized file modification activities that may indicate exploitation of this vulnerability. Organizations must also review their package management policies and ensure that proper security controls are in place to prevent unauthorized package installations or modifications that could exacerbate the vulnerability's impact.