Vulnerability identifier: #VU66718

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Flatpak
Server applications / Frameworks for developing and running applications
ostree
Other software / Other software solutions

Vendor: Flatpak
OSTree Project

Description

The vulnerability allows a local user to delete arbitrary files on the system.

The vulnerability exists due to usage of an old version of libostree, which lacks filtration of ref (branch) names. A local user can force the latpak-system-helper service to delete arbitrary files by requesting deletion of a crafted ref (branch) name.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Flatpak: 0.2.1 - 0.10.1

ostree: 2017.1 - 2017.12

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External links
http://github.com/flatpak/flatpak/security/advisories/GHSA-45jq-5658-v38x
http://github.com/ostreedev/ostree/pull/1286

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.