#VU25671 Resource exhaustion in Pure-FTPd - CVE-2019-20176

Vulnerability identifier: #VU25671

Vulnerability risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Clear]

CVE-ID: CVE-2019-20176

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Pure-FTPd
Server applications / File servers (FTP/HTTP)

Vendor: PureFTPd.org

Description

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

The vulnerability exists due to a stack exhaustion issue in the listdir() function in ls.c. A remote authenticated user can use a specially crafted LS command to perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Pure-FTPd: 1.0.37 - 1.0.49

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External links
https://github.com/jedisct1/pure-ftpd/commit/aea56f4bcb9948d456f3fae4d044fd3fa2e19706
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AHZG5FPCRMCB6Z3L7FPICC6BZ5ZATFTO/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PICL3U2J4EPGBLOE555Y5RAZTQL3WBBV/

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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.