Date: Tue, 24 Jan 2017 16:55:01 -0500 From: Daniel Micay <danielmicay@...il.com> To: oss-security@...ts.openwall.com Subject: Re: Headsup: systemd v228 local root exploit (CVE-2016-10156) On Wed, 2017-01-25 at 01:20 +0500, Alexander E. Patrakov wrote: > 2017-01-24 13:55 GMT+05:00 Sebastian Krahmer <krahmer@...e.com>: > > Hi > > > > This is a heads up for a trivial systemd local root exploit, that > > was silently fixed in the upstream git as: > > > > commit 06eeacb6fe029804f296b065b3ce91e796e1cd0e > > Author: .... > > Date: Fri Jan 29 23:36:08 2016 +0200 > > > > basic: fix touch() creating files with 07777 mode > > That's important for users of Arch Linux and other rolling > distributions. > > If the system has booted the vulnerable version of systemd at least > once, then the files with dangerous permissions will be there. There > is no code in systemd that fixes permissions on already existing stamp > files. There is no postinstall script in Arch that does it, either. > So, you have to fix permissions to 0644 or remove the stamp files > manually, once, even though the commit appeared in Arch repositories > long time ago. Ah, sorry, I didn't see that it did this for /var/lib timer files too. It does seem to recreate them if the timers are still around at least. Download attachment "signature.asc" of type "application/pgp-signature" (867 bytes)
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