Vulnerability identifier: #VU32565

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-4496

CWE-ID: CWE-255

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 gain access to sensitive information.

Samba 3.x before 3.6.23, 4.0.x before 4.0.16, and 4.1.x before 4.1.6 does not enforce the password-guessing protection mechanism for all interfaces, which makes it easier for remote attackers to obtain access via brute-force ChangePasswordUser2 (1) SAMR or (2) RAP attempts.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Samba: 3.0 - 3.0.37, 3.1 - 3.1.0, 3.2 - 3.2.15, 3.3 - 3.3.16, 3.4 - 3.4.17, 3.5 - 3.5.22, 3.6.0 - 3.6.22

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External links
http://advisories.mageia.org/MGASA-2014-0138.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-August/136864.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134717.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html
http://lists.opensuse.org/opensuse-updates/2014-03/msg00062.html
http://lists.opensuse.org/opensuse-updates/2014-03/msg00063.html
http://rhn.redhat.com/errata/RHSA-2014-0330.html
http://security.gentoo.org/glsa/glsa-201502-15.xml
http://www.mandriva.com/security/advisories?name=MDVSA-2015:082
http://www.samba.org/samba/history/samba-3.6.23.html
http://www.samba.org/samba/history/samba-4.0.16.html
http://www.samba.org/samba/history/samba-4.1.6.html
http://www.samba.org/samba/security/CVE-2013-4496
http://www.securityfocus.com/bid/66336
http://www.ubuntu.com/usn/USN-2156-1
http://bugzilla.samba.org/show_bug.cgi?id=10245
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.