#VU32524 Buffer overflow in Samba - CVE-2014-3493

Vulnerability identifier: #VU32524

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2014-3493

CWE-ID: CWE-119

Exploitation vector: Local network

Exploit availability: No

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

Vendor: Samba

Description

The vulnerability allows a remote #AU# to perform service disruption.

The push_ascii function in smbd in Samba 3.6.x before 3.6.24, 4.0.x before 4.0.19, and 4.1.x before 4.1.9 allows remote authenticated users to cause a denial of service (memory corruption and daemon crash) via an attempt to read a Unicode pathname without specifying use of Unicode, leading to a character-set conversion failure that triggers an invalid pointer dereference.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Samba: 3.6.0 - 3.6.23

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External links
https://advisories.mageia.org/MGASA-2014-0279.html
https://linux.oracle.com/errata/ELSA-2014-0866.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-August/136864.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-June/134717.html
https://rhn.redhat.com/errata/RHSA-2014-0866.html
https://secunia.com/advisories/59378
https://secunia.com/advisories/59407
https://secunia.com/advisories/59433
https://secunia.com/advisories/59579
https://secunia.com/advisories/59834
https://secunia.com/advisories/59848
https://secunia.com/advisories/59919
https://secunia.com/advisories/61218
https://security.gentoo.org/glsa/glsa-201502-15.xml
https://www.mandriva.com/security/advisories?name=MDVSA-2014:136
https://www.mandriva.com/security/advisories?name=MDVSA-2015:082
https://www.samba.org/samba/security/CVE-2014-3493
https://www.securityfocus.com/archive/1/532757/100/0/threaded
https://www.securityfocus.com/bid/68150
https://www.securitytracker.com/id/1030455
https://blogs.oracle.com/sunsecurity/entry/multiple_vulnerabilities_in_samba1
https://bugzilla.redhat.com/show_bug.cgi?id=1108748
https://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 authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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