MitM attack in GNOME Balsa

1) Improper validation of certificate with host mismatch

EUVDB-ID: #VU29491

Risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-13645

CWE-ID: CWE-297 - Improper Validation of Certificate with Host Mismatch

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists in GNOME glib-networking due to implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. A remote attacker can perform a Man-in-he-Middle (MitM) attack and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Balsa: 1.1.7 - 2.6.0

External links

http://gitlab.gnome.org/GNOME/balsa/-/issues/34
http://gitlab.gnome.org/GNOME/glib-networking/-/issues/135
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HLEX2IP62SU6WJ4SK3U766XGLQK3J62O/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TQEQJQ4XFMFCFJTEXKL2ZO3UELBPCKSK/
http://security.netapp.com/advisory/ntap-20200608-0004/

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.