#VU73834 Input validation error in Flatpak - CVE-2023-28101

Vulnerability identifier: #VU73834

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-28101

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: Flatpak

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input when displaying permissions and metadata. A remote attacker can create a specially crafted app that manipulates the appearance of the permissions list through metadata, convincing the user into granting to the app more permissions than agreed by the user.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Flatpak: 0.1 - 0.99.3, 1.0.0 - 1.0.9, 1.1.0 - 1.15.3, 1.2.0 - 1.2.5, 1.3.0 - 1.3.4, 1.4.0 - 1.4.4, 1.5.0 - 1.5.2, 1.6.0 - 1.6.5, 1.7.1 - 1.7.3, 1.8.0 - 1.8.7, 1.9.1 - 1.9.3

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External links
https://github.com/flatpak/flatpak/commit/6cac99dafe6003c8a4bd5666341c217876536869
https://github.com/flatpak/flatpak/commit/7fe63f2e8f1fd2dafc31d45154cf0b191ebec66c
https://github.com/flatpak/flatpak/commit/409e34187de2b2b2c4ef34c79f417be698830f6c
https://github.com/flatpak/flatpak/security/advisories/GHSA-h43h-fwqx-mpp8

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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.