Denial of service in Windows FTP Server

Published: 2018-07-10

Risk	Medium
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2018-8206
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Windows Operating systems & Components / Operating system Windows Server Operating systems & Components / Operating system Microsoft IIS Server applications / Web servers
Vendor	Microsoft

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper input validation

EUVDB-ID: #VU13778

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8206

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to improper handling of File Transfer Protocol (FTP) connections. A remote attacker can send specially crafted packets to a Windows computer with the FTP Server role enabled that is accepting connections on TCP port 21 and cause a target system to stop responding.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7 - 10

Windows Server: 2008 - 2016

Microsoft IIS: 7.5 - 10.0

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8206

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.