Vulnerability identifier: #VU26553

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5291

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Bubblewrap
Server applications / Other server solutions

Vendor: Project Atomic

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

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

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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.