NULL pointer dereference in samba (Alpine package)

Published: 2018-08-14

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2018-1140
CWE-ID	CWE-476
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software Subscribe	samba (Alpine package) Operating systems & Components / Operating system package or component
Vendor	Alpine Linux Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) NULL pointer dereference

EUVDB-ID: #VU14337

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 - NULL Pointer Dereference

Exploit availability: No

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

Install update from vendor's website.

Vulnerable software versions

samba (Alpine package): 4.8.2-r1

External links

http://git.alpinelinux.org/aports/commit/?id=7f7614b183e9e8db99c0df510db7706b0b73f229
http://git.alpinelinux.org/aports/commit/?id=702e0f24016274438056f4ad26d72f0dce4778c7
http://git.alpinelinux.org/aports/commit/?id=0a2ff30aa228a3a3b837c73291e9c7b3e396b2f8
http://git.alpinelinux.org/aports/commit/?id=8c6e5428a4982898bfe0a8d6e2c6c64d4f3f653f
http://git.alpinelinux.org/aports/commit/?id=53e46bd2838462d43bb89139a98f91afc31b6a08
http://git.alpinelinux.org/aports/commit/?id=92f3d2b28a5940acc5db51e3889b698e7146e812
http://git.alpinelinux.org/aports/commit/?id=73b2c0f0439b1c5dafaa60daa3d4b63d614c21ea
http://git.alpinelinux.org/aports/commit/?id=d773d4c9846c9af6fff4cf55c1942ce486760f82

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.