#VU14337 NULL pointer dereference in Samba


Published: 2018-08-14

Vulnerability identifier: #VU14337

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-1140

CWE-ID: CWE-476

Exploitation vector: Local network

Exploit availability: No

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

Vendor: Samba

Description

The vulnerability allows a remote attacker to cause denial of service attack.
The vulnerability exists due to improper input validation when processing data from the LDB database layer. A remote attacker can trigger NULL pointer dereference error and cause the LDAP server and DNS server to crash.


Mitigation
Update to version 4.8.4.

Vulnerable software versions

Samba: 4.8.0 - 4.8.3

External links
http://www.samba.org/samba/security/CVE-2018-1140.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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


Latest bulletins with this vulnerability


Gentoo update for Samba
OpenSUSE Linux update for samba
NULL pointer dereference in ldb (Alpine package)
NULL pointer dereference in samba (Alpine package)
Multiple vulnerabilities in Samba