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Samba >= 3.2.0 Bypass File Restriction Vulnerability (CVE-2013-4475)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
ACLs are not checked on opening an alternate data stream on a file or directory.
Insight
Insight
Samba versions 3.2.0 and above (all versions of 3.2.x, 3.3.x, 3.4.x, 3.5.x, 3.6.x, 4.0.x and 4.1.x) do not check the underlying file or directory ACL when opening an alternate data stream. According to the SMB1 and SMB2+ protocols the ACL on an underlying file or directory should control what access is allowed to alternate data streams that are associated with the file or directory. By default no version of Samba supports alternate data streams on files or directories. Samba can be configured to support alternate data streams by loading either one of two virtual file system modues (VFS) vfs_streams_depot or vfs_streams_xattr supplied with Samba, so this bug only affects Samba servers configured this way. To determine if your server is vulnerable, check for the strings 'streams_depot' or 'streams_xattr' inside your smb.conf configuration file.
Affected Software
Affected Software
Samba versions 3.2.0 through 3.6.19, 4.0.0 through 4.0.10 and 4.1.0.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 3.6.20, 4.0.11, 4.1.1 or later.