Fedora 29 update for flatpak
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2019-5736 CVE-2019-8308 |
| CWE-ID | CWE-264 |
| Exploitation vector | Local network |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. |
| Vulnerable software |
Fedora Operating systems & Components / Operating system flatpak Operating systems & Components / Operating system package or component |
| Vendor | Fedoraproject |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Privilege escalation
EUVDB-ID: #VU17474
Risk: Medium
CVSSv4.0: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Green]
CVE-ID: CVE-2019-5736
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to gain elevated privileges.
The weakness exists in the runc container runtime due to file-descriptor mishandling, related to /proc/self/exe. A remote attacker can leverage the ability to execute a command as root within one of these types of containers: (1) a new container with an attacker-controlled image, or (2) an existing container, to which the attacker previously had write access, that can be attached with docker exec, overwrite the host runc binary with minimal user interaction and execute arbitrary code with root privileges.
Successful exploitation of the vulnerability may result in system compromise.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 29
flatpak: before 1.2.3-1.fc29
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2019-fd9345f44a
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. However, a fully functional exploit for this vulnerability is available.
2) 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
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.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsFedora: 29
flatpak: before 1.2.3-1.fc29
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2019-fd9345f44a
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.
