Improper Certificate Validation in evolution-ews

1) Improper Certificate Validation

EUVDB-ID: #VU30974

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3890

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

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

It was discovered evolution-ews before 3.31.3 does not check the validity of SSL certificates. An attacker could abuse this flaw to get confidential information by tricking the user into connecting to a fake server without the user noticing the difference.

Mitigation

Install update from vendor's website.

Vulnerable software versions

evolution-ews: 3.31.1 - 3.31.2

External links

http://access.redhat.com/errata/RHSA-2019:3699
http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3890
http://gitlab.gnome.org/GNOME/evolution-ews/issues/27

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.