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 Subscribe |
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
CVSSv3.1: 6.6 [CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C]
CVE-ID: CVE-2019-8308
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe 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.
MitigationThe vulnerability has been addressed in the versions 1.0.7, 1.2.3.
Vulnerable software versionsFlatpak: 1.0.0 - 1.2.2
External linkshttp://github.com/flatpak/flatpak/commit/cd2142888fc4c199723a0dfca1f15ea8788a5483
http://github.com/flatpak/flatpak/releases/tag/1.0.7
http://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.
