MitM attack in GNOME libgrss

1) Improper Certificate Validation

EUVDB-ID: #VU66988

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-20011

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to missing certificate validation on the SoupSessionSync objects. A remote attacker can perform Man-in-the-Middle (MitM) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

LibGRSS - management of RSS and Atom feeds: 0.3 - 0.7.0

CPE2.3

• cpe:2.3:a:gnome:libgrss_-_management_of_rss_and_atom_feeds:0.3:*:*:*:*:*:*:*
• cpe:2.3:a:gnome:libgrss_-_management_of_rss_and_atom_feeds:0.4:*:*:*:*:*:*:*
• cpe:2.3:a:gnome:libgrss_-_management_of_rss_and_atom_feeds:0.5:*:*:*:*:*:*:*

External links

https://bugzilla.gnome.org/show_bug.cgi?id=772647
https://gitlab.gnome.org/GNOME/libgrss/-/issues/4
https://gitlab.gnome.org/GNOME/libgrss/-/merge_requests/7.patch

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.