Vulnerability identifier: #VU45287

Vulnerability risk: Medium

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

CVE-ID: CVE-2011-0719

CWE-ID: CWE-119

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 perform service disruption.

Samba 3.x before 3.3.15, 3.4.x before 3.4.12, and 3.5.x before 3.5.7 does not perform range checks for file descriptors before use of the FD_SET macro, which allows remote attackers to cause a denial of service (stack memory corruption, and infinite loop or daemon crash) by opening a large number of files, related to (1) Winbind or (2) smbd.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Samba: 3.0.0 - 3.0.37, 3.1.0, 3.2.0 - 3.2.15, 3.3.0 - 3.3.14, 3.4.0 - 3.4.11, 3.5.0 - 3.5.6

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External links
http://lists.apple.com/archives/security-announce/2011//Jun/msg00000.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056229.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056241.html
http://marc.info/?l=bugtraq&m=130835366526620&w=2
http://samba.org/samba/security/CVE-2011-0719.html
http://secunia.com/advisories/43482
http://secunia.com/advisories/43503
http://secunia.com/advisories/43512
http://secunia.com/advisories/43517
http://secunia.com/advisories/43556
http://secunia.com/advisories/43557
http://secunia.com/advisories/43843
http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.593629
http://support.apple.com/kb/HT4723
http://www.debian.org/security/2011/dsa-2175
http://www.mandriva.com/security/advisories?name=MDVSA-2011:038
http://www.redhat.com/support/errata/RHSA-2011-0305.html
http://www.redhat.com/support/errata/RHSA-2011-0306.html
http://www.samba.org/samba/history/samba-3.3.15.html
http://www.samba.org/samba/history/samba-3.4.12.html
http://www.samba.org/samba/history/samba-3.5.7.html
http://www.securityfocus.com/bid/46597
http://www.securitytracker.com/id?1025132
http://www.ubuntu.com/usn/USN-1075-1
http://www.vupen.com/english/advisories/2011/0517
http://www.vupen.com/english/advisories/2011/0518
http://www.vupen.com/english/advisories/2011/0519
http://www.vupen.com/english/advisories/2011/0520
http://www.vupen.com/english/advisories/2011/0522
http://www.vupen.com/english/advisories/2011/0541
http://www.vupen.com/english/advisories/2011/0702
http://bugzilla.redhat.com/show_bug.cgi?id=678328
http://exchange.xforce.ibmcloud.com/vulnerabilities/65724

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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.