Privilege escalation in Bubblewrap

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU26553

Risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-5291

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists within the "bwrap --userns2" option if the affected software is installed in setuid mode and the kernel supports unprivileged user namespaces. A remote authenticated attacker can gain root privileges on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Bubblewrap: 0.4.0

CPE2.3

• cpe:2.3:a:project_atomic:bubblewrap:0.4.0:*:*:*:*:*:*:*

External links

https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240
https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vj

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.