Permissions, Privileges, and Access Controls in gvfs (Alpine package)

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU18676

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-2019-12449

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to mishandling of file user and group ownership in the daemon/gvfsbackendadmin.c file. Operations "G_FILE_COPY_ALL_METADATA" from admin:// URIs to file:// URIs during move-and-copy are handled by the Gnome Input/Output (GIO) fallback code, which does not run with root permissions. A remote attacker can gain unauthorized access to arbitrary file information on a system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

gvfs (Alpine package): 1.34.1-r0

CPE2.3

• cpe:2.3:a:alpine:gvfs_alpine_package:1.34.1-r0:*:*:*:*:alpine_linux:*:3.6

External links

https://git.alpinelinux.org/aports/commit/?id=0c012f09fb2eecc434fec5eab8c7ca78095c950a
https://git.alpinelinux.org/aports/commit/?id=948e97dea02e32af012be430d5f87345a6263d46
https://git.alpinelinux.org/aports/commit/?id=fe8e3f960f8c6ccd7df3b8175b21a261be8fc006
https://git.alpinelinux.org/aports/commit/?id=5c7126a9f9c0fa81ccbcb651ea056d1c02540fbe
https://git.alpinelinux.org/aports/commit/?id=60a89bb75d82e71f7b44cc05bf8f024f66ddfd23

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.