Privilege escalation in Flatpak



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-8308
CWE-ID CWE-264
Exploitation vector Local network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Flatpak
Server applications / Frameworks for developing and running applications

Vendor Flatpak

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Privilege escalation

EUVDB-ID: #VU17726

Risk: Low

CVSSv4.0: 7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2019-8308

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

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to escalate privileges on the system.

The vulnerability exists due an error when handling file descriptors related to /proc/self/exe. An adjacent attacker can trick the victim with root privileges into installing a system-wide Flatpak application that has an apply_extra script, and then run the apply_extra script in a sandbox with /proc mounted to escape sandbox protections and maliciously modify executable files as root on the host system.

Mitigation

The vulnerability has been addressed in the versions 1.0.7, 1.2.3.

Vulnerable software versions

Flatpak: 1.0.0 - 1.2.2

CPE2.3 External links

https://github.com/flatpak/flatpak/commit/cd2142888fc4c199723a0dfca1f15ea8788a5483
https://github.com/flatpak/flatpak/releases/tag/1.0.7
https://github.com/flatpak/flatpak/releases/tag/1.2.3


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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