CVE-2012-5635 in Storage Server
Summary
by MITRE
The GlusterFS functionality in Red Hat Storage Management Console 2.0, Native Client, and Server 2.0 allows local users to overwrite arbitrary files via a symlink attack on multiple temporary files created by (1) tests/volume.rc, (2) extras/hook-scripts/S30samba-stop.sh, and possibly other vectors, different vulnerabilities than CVE-2012-4417.
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Analysis
by VulDB Data Team • 02/20/2018
The vulnerability identified as CVE-2012-5635 affects Red Hat Storage Management Console version 2.0 and related components, presenting a significant security risk through improper handling of temporary files during system operations. This issue stems from the insecure creation of temporary files without proper validation mechanisms, allowing local attackers to manipulate the system through symbolic link attacks. The vulnerability specifically impacts the GlusterFS functionality within the storage management framework, where multiple scripts create temporary files that can be exploited by malicious users with local access privileges.
The technical flaw manifests in the way temporary files are created and managed by scripts such as tests/volume.rc and extras/hook-scripts/S30samba-stop.sh, which do not implement proper security controls to prevent symlink attacks. When these scripts create temporary files, they often use predictable naming conventions and lack proper file access controls or atomic creation mechanisms. Attackers can exploit this by creating symbolic links with the same names as expected temporary files, effectively redirecting file operations to arbitrary locations on the filesystem. This technique allows unauthorized file overwrites and can potentially lead to privilege escalation or system compromise.
The operational impact of CVE-2012-5635 extends beyond simple file manipulation, as it represents a fundamental flaw in the security design of the storage management console. Local users who gain access to the system can leverage this vulnerability to overwrite critical system files, configuration data, or even execute malicious code through the overwritten files. The attack vector is particularly concerning because it requires minimal privileges and can be executed by any user with local access, making it a significant risk for environments where multiple users share the same system resources. This vulnerability undermines the integrity of the storage management operations and can lead to data corruption or unauthorized system modifications.
The security implications of this vulnerability align with CWE-377, which addresses insecure temporary file handling, and can be categorized under ATT&CK technique T1059 for execution through system commands and T1068 for local privilege escalation. Mitigation strategies should focus on implementing proper temporary file handling practices including the use of secure temporary file creation functions, proper file permissions, and atomic file operations. Organizations should also consider implementing file system monitoring and access controls to detect and prevent unauthorized symbolic link creation. The recommended approach involves updating to patched versions of Red Hat Storage Management Console, implementing strict temporary file directory permissions, and conducting regular security audits of script execution environments to prevent similar vulnerabilities from being exploited in other components of the system.