Input validation error in Samba

1) Input validation error

EUVDB-ID: #VU33812

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-2015-3223

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The ldb_wildcard_compare function in ldb_match.c in ldb before 1.1.24, as used in the AD LDAP server in Samba 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3, mishandles certain zero values, which allows remote attackers to cause a denial of service (infinite loop) via crafted packets.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Samba: 3.4.0 - 4.1.21

External links

http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html
http://www.debian.org/security/2016/dsa-3433
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
http://www.securityfocus.com/bid/79731
http://www.securitytracker.com/id/1034493
http://www.ubuntu.com/usn/USN-2855-1
http://www.ubuntu.com/usn/USN-2855-2
http://www.ubuntu.com/usn/USN-2856-1
http://bugzilla.redhat.com/show_bug.cgi?id=1290287
http://git.samba.org/?p=samba.git;a=commit;h=aa6c27148b9d3f8c1e4fdd5dd46bfecbbd0ca465
http://git.samba.org/?p=samba.git;a=commit;h=ec504dbf69636a554add1f3d5703dd6c3ad450b8
http://security.gentoo.org/glsa/201612-47
http://www.samba.org/samba/security/CVE-2015-3223.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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