Improper Certificate Validation in ProFTPD - CVE-2019-19271
Published: November 26, 2019 / Updated: September 7, 2020
Vulnerability identifier: #VU30580
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-19271
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to manipulate data.
An issue was discovered in tls_verify_crl in ProFTPD before 1.3.6. A wrong iteration variable, used when checking a client certificate against CRL entries (installed by a system administrator), can cause some CRL entries to be ignored, and can allow clients whose certificates have been revoked to proceed with a connection to the server.
Affected software
ProFTPD
QNAP QTS
Fedora
proftpd
QNAP QTS
Fedora
proftpd
How to mitigate CVE-2019-19271
Install update from vendor's website.
ProFTPD - update to 1.3.6
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 - update to 1.3.5e-8.el7
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 - update to 1.3.5e-8.el7