#VU47993 Memory corruption in Samba - CVE-2020-14383

Vulnerability identifier: #VU47993

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-14383

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

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

Vendor: Samba

Description

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

The vulnerability exists due to a boundary error when processing DNS records. A remote user

 with ability to create MX or NS records with absent properties can trigger the RPC service to dereference uninitialized memory and will result in denial of service attack against the RPC service.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Samba: 4.0.0 - 4.0.26, 4.1.0 - 4.13.0, 4.2.0 - 4.2.14, 4.3.0 - 4.3.13, 4.4.0 rc4 - 4.4.16, 4.5.0 - 4.5.16, 4.6.0 - 4.6.16, 4.7.0 - 4.7.12, 4.8.0 - 4.8.12, 4.9.0 - 4.9.18

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External links
https://www.samba.org/samba/security/CVE-2020-14383.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 Internet.

Is there known malware, which exploits this vulnerability?

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