#VU18678 Permissions, Privileges, and Access Controls in gvfs - CVE-2019-12447

Vulnerability identifier: #VU18678

Vulnerability risk: Critical

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Red]

CVE-ID: CVE-2019-12447

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
gvfs
Client/Desktop applications / Other client software

Vendor: Gnome Development Team

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to functionality in the daemon/gvfsbackendadmin.c file doesn't make use of "setfsuid" call when handling ownership permissions. A remote attacker can gain unauthorized access to arbitrary files on a system.

Mitigation

Vulnerable software versions

gvfs: 1.29.4 - 1.41.2

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External links
https://gitlab.gnome.org/GNOME/gvfs/commit/3895e09d784ebec0fbc4614d5c37068736120e1d
https://gitlab.gnome.org/GNOME/gvfs/commit/daf1163aba229afcfddf0f925aef7e97047e8959

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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.