CVE-2016-9595 in katello-debug
Summary
by MITRE
A flaw was found in katello-debug before 3.4.0 where certain scripts and log files used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.
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Analysis
by VulDB Data Team • 04/27/2023
The vulnerability identified as CVE-2016-9595 resides within the katello-debug component of the Katello management system, specifically affecting versions prior to 3.4.0. This flaw represents a critical security weakness that stems from the improper handling of temporary files during script execution and log processing operations. The issue manifests when the system creates temporary files without adequate security measures, leaving them susceptible to manipulation by local users who possess minimal privileges. The vulnerability falls under the category of insecure temporary file handling, which is commonly classified as CWE-377 and CWE-378 within the Common Weakness Enumeration framework, representing poor security practices in temporary file creation and management.
The technical exploitation of this vulnerability occurs through symbolic-link attacks that leverage the insecure temporary file creation mechanism. When katello-debug executes scripts or processes log files, it generates temporary files in predictable locations without proper access controls or validation mechanisms. A local attacker can create symbolic links in the temporary file paths, effectively redirecting the write operations intended for legitimate temporary files to arbitrary locations on the filesystem. This allows the attacker to overwrite contents of files they would normally not have permission to modify, potentially leading to privilege escalation or data corruption scenarios. The attack vector is particularly concerning because it requires minimal privileges to execute but can result in significant system compromise.
From an operational impact perspective, this vulnerability creates a serious risk for systems utilizing Katello for content management and satellite operations. The ability to overwrite arbitrary files through symbolic-link manipulation can lead to complete system compromise, especially when combined with other attack vectors or when targeting system-critical files. Attackers could potentially overwrite configuration files, binary executables, or system logs, leading to denial of service, data loss, or persistent backdoor installation. The vulnerability also impacts the integrity of system logs and debugging information, which are crucial for security monitoring and incident response activities. This type of attack aligns with techniques documented in the MITRE ATT&CK framework under T1059 for execution and T1070 for indicator removal, as attackers can manipulate system files to hide their presence or maintain persistence.
The mitigation strategy for CVE-2016-9595 requires immediate patching of affected katello-debug installations to version 3.4.0 or later, where the insecure temporary file handling has been corrected. System administrators should also implement proper temporary file creation practices, including using secure temporary file creation functions that provide atomic creation with proper permissions, validating temporary file paths, and ensuring that temporary files are created with restrictive access controls. Additional protective measures include monitoring for suspicious symbolic-link creation in temporary directories, implementing file integrity monitoring solutions, and conducting regular security audits of script execution environments. Organizations should also consider implementing least privilege principles for temporary file operations and establishing proper logging mechanisms to detect unauthorized file overwrites or symbolic-link manipulations that may indicate exploitation attempts.