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Date: Fri, 30 Sep 2016 02:52:02 -0400 (EDT)
From: cve-assign@...re.org
To: agwa@...rewayer.name
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE Request: systemd v209+: local denial-of-service attack
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> https://github.com/systemd/systemd/issues/4234
> https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet
> systemd fails an assertion in manager_invoke_notify_message when
> a zero-length message is received over its notification socket.
> After failing the assertion, PID 1 hangs in the pause system call.
> It is no longer possible to start and stop daemons or cleanly reboot
> the system. Inetd-style services managed by systemd no longer accept
> connections.
>
> Since the notification socket, /run/systemd/notify, is world-writable,
> this allows a local user to perform a denial-of-service attack against
> systemd.
>
> Proof-of-concept:
>
> NOTIFY_SOCKET=/run/systemd/notify systemd-notify ""
Use CVE-2016-7795.
>> https://github.com/systemd/systemd/issues/4234#issuecomment-250441246
>> Older distros are affected differently I think: no assertion is
>> triggered but manager_dispatch_notify_fd() still returns an error
>> which has the bad side effect to disable the notification handler
>> completely
Use CVE-2016-7796.
- --
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
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