Permissions, Privileges, and Access Controls in Bubblewrap - CVE-2020-5291
Published: April 3, 2020
Vulnerability identifier: #VU26553
CSH Severity: High
CVSS v4: 8.7 [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]
CVE-ID: CVE-2020-5291
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Bubblewrap
bubblewrap (Alpine package)
bubblewrap (Alpine package)
How to mitigate CVE-2020-5291
Install updates from vendor's website.
Bubblewrap - update to 0.4.1
bubblewrap (Alpine package) - update to 0.4.1-r0
bubblewrap (Alpine package) - update to 0.4.1-r0