Infinite loop in ProFTPD - CVE-2019-18217

Vulnerability identifier: #VU22564

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-18217

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

ProFTPD
QNAP QTS
Gentoo Linux
Fedora
SUSE Linux
Opensuse
proftpd-dfsg (Debian package)
proftpd
SIMATIC CP 1543-1

Install updates from vendor's website.

ProFTPD - update to 1.3.6b
proftpd-dfsg (Debian package) - addressed in versions 1.3.5b-4+deb9u2, 1.3.6-4+deb10u2
SIMATIC CP 1543-1 - update to 2.2
QNAP QTS - addressed in versions 4.2.6 20200821, 4.3.3.1386 20200821, 4.3.6.1411 20200825, 4.4.3.1400 20200817
proftpd - addressed in versions 1.3.3g-11.el6, 1.3.5e-6.el7, 1.3.6b-1.fc29, 1.3.6b-1.fc30, 1.3.6b-1.fc31

• https://github.com/proftpd/proftpd/blob/1.3.6/NEWS
• https://github.com/proftpd/proftpd/blob/1.3.6/RELEASE_NOTES
• https://github.com/proftpd/proftpd/blob/master/NEWS
• https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES
• https://github.com/proftpd/proftpd/issues/846

• Denial of service in ProFTPD
• Debian update for proftpd-dfsg
• Multiple vulnerabilities in Siemens SIMATIC CP 1543-1
• Gentoo update for ProFTPd
• Security update for third-party software in QNAP QTS
• OpenSUSE Linux update for proftpd
• Fedora 29 update for proftpd
• Fedora 30 update for proftpd
• Fedora 31 update for proftpd
• Fedora EPEL 7 update for proftpd
• Fedora EPEL 6 update for proftpd