Vulnerability Description
Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user namespaces, then the `bwrap --userns2` option can be used to make the setuid process keep running as root while being traceable. This can in turn be used to gain root permissions. Note that this only affects the combination of bubblewrap in setuid mode (which is typically used when unprivileged user namespaces are not supported) and the support of unprivileged user namespaces. Known to be affected are: * Debian testing/unstable, if unprivileged user namespaces enabled (not default) * Debian buster-backports, if unprivileged user namespaces enabled (not default) * Arch if using `linux-hardened`, if unprivileged user namespaces enabled (not default) * Centos 7 flatpak COPR, if unprivileged user namespaces enabled (not default) This has been fixed in the 0.4.1 release, and all affected users should update.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Projectatomic | Bubblewrap | < 0.4.1 |
| Debian | Debian Linux | 10.0 |
| Archlinux | Arch Linux | - |
| Centos | Centos | 7.0 |
Related Weaknesses (CWE)
References
- https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215PatchThird Party Advisory
- https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vjMitigationThird Party Advisory
- https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215PatchThird Party Advisory
- https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vjMitigationThird Party Advisory
FAQ
What is CVE-2020-5291?
CVE-2020-5291 is a vulnerability with a CVSS score of 7.2 (HIGH). Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user namespaces, then the `bwrap --userns2` option can be used to make the setuid process keep...
How severe is CVE-2020-5291?
CVE-2020-5291 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-5291?
Check the references section above for vendor advisories and patch information. Affected products include: Projectatomic Bubblewrap, Debian Debian Linux, Archlinux Arch Linux, Centos Centos.