Vulnerability identifier: #VU29484

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-10745

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

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

Vendor: Samba

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources when processing NBT and DNS replies.  A remote attacker can send a name in the reply to a NBT or DNS request and consume excessive CPU resources, resulting in denial of service conditions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Samba: 4.11.0 - 4.11.10, 4.12.0 - 4.12.3, 4.10.0 - 4.10.16, 4.9.0 - 4.9.18, 4.8.0 - 4.8.12, 4.7.0 - 4.7.12, 4.6.0 - 4.6.16, 4.5.0 - 4.5.16, 4.4.0 - 4.4.16, 4.3.0 - 4.3.13, 4.2.0 - 4.2.14, 4.1.0 - 4.1.23, 4.0.0 - 4.0.26

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External links
http://www.samba.org/samba/security/CVE-2020-10745.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.