[ASA-201902-24] systemd: denial of service

[Morten Linderud]

Arch Linux Security Advisory ASA-201902-24
==========================================

Severity: High
Date    : 2019-02-21
CVE-ID  : CVE-2019-6454
Package : systemd
Type    : denial of service
Remote  : No
Link    : https://security.archlinux.org/AVG-906

Summary
=======

The package systemd before version 241.7-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 241.7-1.

# pacman -Syu "systemd>=241.7-1"

The problem has been fixed upstream in version 241.7.

Workaround
==========

None.

Description
===========

It was found that bus_process_object() in bus-objects.c allocates a
buffer on the stack large enough to temporarily store the object path
specified in the incoming message. A malicious unprivileged local user
to send a message which results in the stack pointer moving outside of
the bounds of the currently mapped stack region, jumping over the stack
guard pages. A specifically crafted DBUS message could crash PID 1 and
result in a subsequent kernel panic.

Impact
======

A local attacker can cause a denial of service via a crafted DBUS
message.

References
==========

https://bugs.archlinux.org/task/61804
https://bugzilla.redhat.com/show_bug.cgi?id=1667032
https://www.openwall.com/lists/oss-security/2019/02/18/3
https://github.com/systemd/systemd/commit/612b74d32f970c43c14ad087ad086424792981b1
https://github.com/systemd/systemd/commit/61397a60d98e368a5720b37e83f3169e3eb511c4
https://github.com/systemd/systemd/commit/f519a19bcd5afe674a9b8fc462cd77d8bad403c1
https://security.archlinux.org/CVE-2019-6454
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