#VU14334 NULL pointer dereference in Samba - CVE-2018-10918

Vulnerability identifier: #VU14334

Vulnerability risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-10918

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 a NULL pointer deference error when processing directory attributes from the LDB database layer within the DsCrackNames() function in DRSUAPI RPC server. A remote authenticated attacker can send a specially crafted request to the vulnerable samba server, trigger NULL pointer dereference error and crash the affected server.

Successful exploitation of the vulnerability requires that the Samba is configured as an Active Directory Domain Controller.

Mitigation
Update to version 4.7.9 or 4.8.4.

Vulnerable software versions

Samba: 4.7.0 - 4.7.8, 4.8.0 - 4.8.3

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External links
https://www.samba.org/samba/security/CVE-2018-10918.html

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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