Vulnerability Details : CVE-2020-5291
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.
Products affected by CVE-2020-5291
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:centos:centos:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:projectatomic:bubblewrap:*:*:*:*:*:*:*:*
- cpe:2.3:o:archlinux:arch_linux:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-5291
0.18%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 36 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-5291
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
8.5
|
HIGH | AV:N/AC:M/Au:S/C:C/I:C/A:C |
6.8
|
10.0
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST | |
|
7.2
|
HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N |
0.8
|
5.8
|
GitHub, Inc. |
CWE ids for CVE-2020-5291
-
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.Assigned by: nvd@nist.gov (Primary)
-
The product does not conform to the API requirements for a function call that requires extra privileges. This could allow attackers to gain privileges by causing the function to be called incorrectly.Assigned by: security-advisories@github.com (Secondary)
References for CVE-2020-5291
-
https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240
Merge pull request from GHSA-j2qp-rvxj-43vj · containers/bubblewrap@1f7e2ad · GitHubPatch;Third Party Advisory
-
https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vj
Privilege escalation in setuid mode via user namespaces · Advisory · containers/bubblewrap · GitHubMitigation;Third Party Advisory
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