NULL pointer dereference in GNOME font viewer

Published: 2019-11-28 | Updated: 2021-09-21

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2019-19308
CWE-ID	CWE-476
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Gnome Font Viewer Client/Desktop applications / Multimedia software
Vendor	Gnome Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) NULL pointer dereference

EUVDB-ID: #VU23073

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-19308

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in text_to_glyphs in sushi-font-widget.c in Gnome font viewer while parsing a TTF font file that lacks a name section. A remote attacker can pass a specially crafted TTF file to the affected application and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Gnome Font Viewer: 3.33.4 - 3.34.0

External links

http://github.com/GNOME/gnome-font-viewer/blob/919dfbe684b75904563b8c6723c9778a4e00aad7/src/sushi-font-widget.c#L115-L117
http://gitlab.gnome.org/GNOME/gnome-font-viewer/issues/17

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.