Vulnerability identifier: #VU22564

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18217

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ProFTPD
Server applications / File servers (FTP/HTTP)

Vendor: ProFTPD

Description

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

The vulnerability exists due to infinite loop in main.c in a child process when handling overly long commands. A remote non-authenticated attacker can perform a denial of service attack by sending an overly log command to the affected FTP server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ProFTPD: 1.3.0 - 1.3.6a

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External links
http://github.com/proftpd/proftpd/blob/1.3.6/NEWS
http://github.com/proftpd/proftpd/blob/1.3.6/RELEASE_NOTES
http://github.com/proftpd/proftpd/blob/master/NEWS
http://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES
http://github.com/proftpd/proftpd/issues/846

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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.