Multiple vulnerabilities in Samba

Published: 2019-06-19

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-12435 CVE-2019-12436
CWE-ID	CWE-476
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software Subscribe	Samba Server applications / Directory software, identity management
Vendor	Samba

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU18844

Risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12435

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within the DNS management server (dnsserver) RPC pipe. A remote authenticated user can perform denial of service (DoS) attack against the AD DC server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Samba: 4.9.0 - 4.10.4

External links

http://www.samba.org/samba/security/CVE-2019-12435.html

Q & A

Can this vulnerability be exploited remotely?

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

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.

2) NULL pointer dereference

EUVDB-ID: #VU18845

Risk: Medium