Input validation error in Samba

1) Input validation error

EUVDB-ID: #VU33830

Risk: High

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2015-0240

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The Netlogon server implementation in smbd in Samba 3.5.x and 3.6.x before 3.6.25, 4.0.x before 4.0.25, 4.1.x before 4.1.17, and 4.2.x before 4.2.0rc5 performs a free operation on an uninitialized stack pointer, which allows remote attackers to execute arbitrary code via crafted Netlogon packets that use the ServerPasswordSet RPC API, as demonstrated by packets reaching the _netr_ServerPasswordSet function in rpc_server/netlogon/srv_netlog_nt.c.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Samba: 3.6.0 - 4.2.14

External links

http://advisories.mageia.org/MGASA-2015-0084.html
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00028.html
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00030.html
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00031.html
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html
http://marc.info/?l=bugtraq&m=142722696102151&w=2
http://marc.info/?l=bugtraq&m=143039217203031&w=2
http://rhn.redhat.com/errata/RHSA-2015-0249.html
http://rhn.redhat.com/errata/RHSA-2015-0250.html
http://rhn.redhat.com/errata/RHSA-2015-0251.html
http://rhn.redhat.com/errata/RHSA-2015-0252.html
http://rhn.redhat.com/errata/RHSA-2015-0253.html
http://rhn.redhat.com/errata/RHSA-2015-0254.html
http://rhn.redhat.com/errata/RHSA-2015-0255.html
http://rhn.redhat.com/errata/RHSA-2015-0256.html
http://rhn.redhat.com/errata/RHSA-2015-0257.html
http://security.gentoo.org/glsa/glsa-201502-15.xml
http://www.debian.org/security/2015/dsa-3171
http://www.mandriva.com/security/advisories?name=MDVSA-2015:081
http://www.mandriva.com/security/advisories?name=MDVSA-2015:082
http://www.oracle.com/technetwork/topics/security/bulletinjan2015-2370101.html
http://www.securityfocus.com/bid/72711
http://www.securitytracker.com/id/1031783
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.360345
http://www.ubuntu.com/usn/USN-2508-1
http://access.redhat.com/articles/1346913
http://bugzilla.redhat.com/show_bug.cgi?id=1191325
http://securityblog.redhat.com/2015/02/23/samba-vulnerability-cve-2015-0240/
http://support.lenovo.com/product_security/samba_remote_vuln
http://support.lenovo.com/us/en/product_security/samba_remote_vuln
http://www.exploit-db.com/exploits/36741/
http://www.samba.org/samba/security/CVE-2015-0240

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?

Yes. This vulnerability is being exploited in the wild.