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Date: Tue, 19 May 2020 22:17:42 +0200
From: Solar Designer <solar@...nwall.com>
To: owl-users@...ts.openwall.com
Subject: Owl kernel update
Hi,
In a recent discussion with Adam Zabrocki around LKRG and which exploits
it prevents, he happened to reference a blog post series from late 2018
on exploiting CVE-2017-11176, and I realized that we didn't patch this
vulnerability in Owl kernels. Oops. While Owl isn't actively supported
anymore and hasn't been for some years, I am likely to get the really
critical fixes like this in. So here goes, in Owl-current only for now:
2020/05/19 Package: kernel
SECURITY FIX Severity: high, local, active
Merged the most relevant fixes from RHEL5's -436, including for the
following local vulnerabilities: use-after-free in sys_mq_notify()
allowing for a local root compromise and container escape by any user
(CVE-2017-11176), divide-by-zero in __tcp_select_window() allowing for a
local DoS (CVE-2017-14106), use-after-free in ALSA allowing for a local
root compromise by a host user in group "audio" if the vulnerable kernel
module is loaded (CVE-2017-15265). Also fixed is an inconsistency in
modify_ldt(2)'s memory (de)allocation, which got introduced along with
KPTI in our update to -431 and is known as Red Hat's "bug 1584622" and
might have had local security impact.
References:
https://access.redhat.com/errata/RHSA-2018:3822
https://access.redhat.com/errata/RHSA-2018:2172
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11176
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14106
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15265
https://blog.lexfo.fr/cve-2017-11176-linux-kernel-exploitation-part1.html
I'll likely get this into 3.1-stable soon as well.
On a related note, Sergio contributed an update of e2fsprogs into
Owl-current earlier this year. While I don't see much need for this one
update on its own (without us revitalizing Owl), I also saw no reason to
reject it, so we have:
2020/02/04 Package: e2fsprogs
SECURITY FIX Severity: none to high, indirect, passive
Updated to 1.45.5. Since the version of e2fsprogs that we had packaged
previously, multiple vulnerabilities with attack vectors via malicious
filesystem images have been found and fixed in e2fsprogs components.
Those vulnerabilities don't pose a risk to typical systems that do not
use untrusted filesystem images, but are high impact on those that do.
References:
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0973
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0887
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5188
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5094
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1572
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0247
Alexander
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