Vulnerability identifier: #VU32622

Vulnerability risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-4475

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Samba
Server applications / Directory software, identity management

Vendor: Samba

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Samba 3.2.x through 3.6.x before 3.6.20, 4.0.x before 4.0.11, and 4.1.x before 4.1.1, when vfs_streams_depot or vfs_streams_xattr is enabled, allows remote attackers to bypass intended file restrictions by leveraging ACL differences between a file and an associated alternate data stream (ADS).

Mitigation
Install update from vendor's website.

Vulnerable software versions

Samba: 3.2.0 - 3.2.15

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External links
http://lists.fedoraproject.org/pipermail/package-announce/2014-August/136864.html
http://lists.opensuse.org/opensuse-security-announce/2014-01/msg00002.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00083.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00115.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00117.html
http://lists.opensuse.org/opensuse-updates/2013-12/msg00088.html
http://rhn.redhat.com/errata/RHSA-2013-1806.html
http://rhn.redhat.com/errata/RHSA-2014-0009.html
http://secunia.com/advisories/56508
http://security.gentoo.org/glsa/glsa-201502-15.xml
http://www.debian.org/security/2013/dsa-2812
http://www.samba.org/samba/history/samba-3.6.20.html
http://www.samba.org/samba/history/samba-4.0.11.html
http://www.samba.org/samba/history/samba-4.1.1.html
http://www.samba.org/samba/security/CVE-2013-4475
http://www.securityfocus.com/bid/63646
http://www.ubuntu.com/usn/USN-2054-1
http://blogs.oracle.com/sunsecurity/entry/cve_2013_4475_access_control
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05115993

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.