Vulnerabilities > CVE-2020-5291 - Improper Privilege Management vulnerability in multiple products
Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Restful Privilege Elevation Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
Nessus
NASL family | PhotonOS Local Security Checks |
NASL id | PHOTONOS_PHSA-2020-3_0-0078_BUBBLEWRAP.NASL |
description | An update of the bubblewrap package has been released. |
last seen | 2020-04-30 |
modified | 2020-04-21 |
plugin id | 135780 |
published | 2020-04-21 |
reporter | This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. |
source | https://www.tenable.com/plugins/nessus/135780 |
title | Photon OS 3.0: Bubblewrap PHSA-2020-3.0-0078 |
code |
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References
- https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240
- https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240
- https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vj
- https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vj