Is CVE-2020-5291 in the CISA KEV catalog?

No. CVE-2020-5291 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-5291?

CVE-2020-5291 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2020-5291?

CVE-2020-5291 has an EPSS score of 0.91% (55th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-5291?

Upgrade bubblewrap on debian 11 to 0.4.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2020-5291

HIGH

7.2

CVSS v3

NVD

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.

CWE-648 CWE-269Improper Privilege Management

How to fix

Remediation Available

bubblewrapDebian

Fixed in:0.4.1-1CVE-2020-5291

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

Exploit Intelligence

0.91%probability of exploitation in 30 days

55thpercentile

Moderate risk: more likely to be exploited than 55% of all known CVEs.

References

Patch1

github.com

Mitigation1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.