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CVE-2020-5291— Privilege escalation in setuid mode via user namespaces in Bubblewrap

Quick assessment

Affected
containers bubblewrap
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bubblewrap是一套非特权沙盒工具。 Bubblewrap (bwrap) 0.4.1之前版本中存在安全漏洞。攻击者可利用该漏洞获取root权限。

CVSS 7.2 · High EPSS 0.91% · P57
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I. Basic Information for CVE-2020-5291

Vulnerability Information
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Vulnerability Title
Privilege escalation in setuid mode via user namespaces in Bubblewrap
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权API的不正确使用
Source: CVE Program / CVE List V5
Vulnerability Title
Bubblewrap 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bubblewrap是一套非特权沙盒工具。 Bubblewrap (bwrap) 0.4.1之前版本中存在安全漏洞。攻击者可利用该漏洞获取root权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
containers bubblewrap < 0.4.1 -

II. Public POCs for CVE-2020-5291

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III. Intelligence Information for CVE-2020-5291

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Patches & Fixes for CVE-2020-5291 (1)

Vendor Advisories for CVE-2020-5291 (1)

IV. Related Vulnerabilities

Same product: bubblewrap
Same vendor: containers
Same weakness: CWE-648

V. Comments for CVE-2020-5291

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