Multiple vulnerabilities in ProFTPD

1) Improper Certificate Validation

EUVDB-ID: #VU35035

Risk: Medium

CVSSv4.0: 6.6 [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/E:U/U:Green]

CVE-ID: CVE-2019-19270

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

An issue was discovered in tls_verify_crl in ProFTPD through 1.3.6b. Failure to check for the appropriate field of a CRL entry (checking twice for subject, rather than once for subject and once for issuer) prevents some valid CRLs from being taken into account, and can allow clients whose certificates have been revoked to proceed with a connection to the server.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ProFTPD: 1.3.6

Fedora: 1.3.6 - 31

CPE2.3

• cpe:2.3:a:proftpd:proftpd:1.3.6:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:1.3.6:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

External links

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00009.html
http://github.com/proftpd/proftpd/issues/859
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGBBCPLJSDPFG5EI5P5G7P4KEX7YSD5G/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QR65XUHPCRU3NXTSFVF2J4GWRIHC7AHW/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Security Features

EUVDB-ID: #VU40410

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-3125

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

The mod_tls module in ProFTPD before 1.3.5b and 1.3.6 before 1.3.6rc2 does not properly handle the TLSDHParamFile directive, which might cause a weaker than intended Diffie-Hellman (DH) key to be used and consequently allow attackers to have unspecified impact via unknown vectors.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ProFTPD: 1.3.6

Opensuse: 1.3.6 - 13.1

Fedora: 1.3.6 - 23

CPE2.3

• cpe:2.3:a:proftpd:proftpd:1.3.6:*:*:*:*:*:*:*
• cpe:2.3:o:suse:opensuse:1.3.6:*:*:*:*:*:*:*
• cpe:2.3:o:suse:opensuse:13.1:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:1.3.6:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:13.1:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*

External links

http://bugs.proftpd.org/show_bug.cgi?id=4230
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/179109.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/179143.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/179905.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00080.html
http://lists.opensuse.org/opensuse-updates/2016-06/msg00045.html
http://proftpd.org/docs/NEWS-1.3.5b
http://proftpd.org/docs/NEWS-1.3.6rc2
http://www.openwall.com/lists/oss-security/2016/03/11/14
http://www.openwall.com/lists/oss-security/2016/03/11/3

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.