CVE-2005-1774 in web-dav linux file system
Summary
by MITRE
web-dav linux file system (davfs2) 0.2.3 does not properly enforce unix permissions which allows local users to write arbitrary files on a davfs2 mounted filesystem.
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Analysis
by VulDB Data Team • 07/24/2017
The vulnerability identified as CVE-2005-1774 affects the davfs2 implementation of the Web Distributed Authoring and Versioning protocol on linux systems. This flaw exists in version 0.2.3 of the davfs2 filesystem driver which is designed to provide webdav capabilities through standard unix filesystem interfaces. The vulnerability stems from improper enforcement of unix permission controls within the davfs2 mount point, creating a significant security risk for local users who have access to the mounted filesystem.
The technical flaw manifests in the failure of davfs2 to properly validate and enforce unix permission semantics when handling file operations on the mounted webdav filesystem. This allows local users to bypass normal permission restrictions and write arbitrary files to the mounted filesystem, effectively undermining the security model that unix systems rely upon for file access control. The implementation does not correctly translate or enforce the permission attributes that should normally govern file creation, modification, and access within the unix filesystem paradigm.
Operationally this vulnerability presents a serious threat to system security as it enables local users to potentially inject malicious content into webdav mounted filesystems. Attackers could exploit this weakness to place backdoors, modify existing files, or create unauthorized data within the mounted filesystem, potentially leading to privilege escalation or persistent access. The impact extends beyond simple file manipulation as it undermines the fundamental security assumptions of unix permission models and can compromise the integrity of data stored on remote webdav servers.
The vulnerability aligns with CWE-276, which addresses improper file permissions, and relates to ATT&CK technique T1059.007 for command and scripting interpreter with local file system access. Mitigation strategies should include immediate upgrade to patched versions of davfs2, implementation of proper access controls on the mounted filesystem, and monitoring for unauthorized file creation or modification activities. System administrators should also consider restricting local user access to webdav mounts and implementing additional security layers such as mandatory access controls or file integrity monitoring to detect and prevent exploitation of this vulnerability.