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CVE-2019-3844

Status Candidate

Overview

It was discovered that a systemd service that uses DynamicUser property can get new privileges through the execution of SUID binaries, which would allow to create binaries owned by the service transient group with the setgid bit set. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the GID will be recycled.

Related Files

Red Hat Security Advisory 2020-1794-01
Posted Apr 28, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-1794-01 - The systemd packages contain systemd, a system and service manager for Linux, compatible with the SysV and LSB init scripts. It provides aggressive parallelism capabilities, uses socket and D-Bus activation for starting services, offers on-demand starting of daemons, and keeps track of processes using Linux cgroups.

tags | advisory
systems | linux, redhat
advisories | CVE-2019-3843, CVE-2019-3844
SHA-256 | d5ecc1fe36edb6481e7e9b4bef611a58936b4a419709b8d114457fa03c0f95c6
systemd DynamicUser SetUID Binary Creation
Posted Apr 25, 2019
Authored by Jann Horn, Google Security Research

This bug report describes a bug in systemd that allows a service with DynamicUser in collaboration with another service or user to create a setuid binary that can be used to access its UID beyond the lifetime of the service. This bug probably has relatively low severity, given that there are not many services yet that use DynamicUser, and the requirement of collaboration with another process limits the circumstances in which it would be useful to an attacker further; but in a system that makes heavy use of DynamicUser, it would probably have impact.

tags | exploit
advisories | CVE-2019-3844
SHA-256 | 064bbdd76f48df03346ba02e71f7b8230c92792ac615692d64f9d04ec97b425c
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