This bug was fixed in the package apparmor - 2.10.95-0ubuntu2.11
---------------
apparmor (2.10.95-0ubuntu2.11) xenial-security; urgency=medium
* Make dnsmasq profile and Python utility changes necessary to continue
working correctly after the Linux kernel change to address CVE-2019-11190.
Without these changes, some profile transitions may be unintentionally
denied. (LP: #1830802)
- 0001-dnsmasq-allow-libvirt_leaseshelper-m-permission-on-i.patch
- 0001-handle_children-automatically-add-m-permissions-on-i.patch
-- Tyler Hicks <tyhi...@canonical.com> Tue, 28 May 2019 21:33:21 +0000
** Changed in: apparmor (Ubuntu)
Status: New => Fix Released
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2019-11190
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https://bugs.launchpad.net/bugs/1830802
Title:
AppArmor profile transition changes required by Linux kernel fix for
CVE-2019-11190
Status in apparmor package in Ubuntu:
Fix Released
Bug description:
[Impact]
* As discussed in bug #1628745, the following kernel commit changes
AppArmor mediation behavior on exec transitions:
commit 9f834ec18defc369d73ccf9e87a2790bfa05bf46
Author: Linus Torvalds <torva...@linux-foundation.org>
Date: Mon Aug 22 16:41:46 2016 -0700
binfmt_elf: switch to new creds when switching to new mm
* This change made its way into the Xenial kernel that's currently in
xenial-proposed (4.4.0-149.175-generic) as it fixes CVE-2019-11190.
* jdstrand identified a couple missing fixes that are needed from the
AppArmor tree:
d8278f51ecb3c736d697fa367faf99457210a7d8
7a49f37c2481f761f8304712aa380acddfdb6303
[Test Case]
For the dnsmasq change in apparmor-profiles,
1) Install libvirt-bin and apparmor-profiles
2) Install linux 4.4.0-149.175 from xenial-proposed
3) Reboot
4) Ensure that there is *NOT* an ALLOWED message like this:
$ dmesg | grep ALLOWED
apparmor="ALLOWED" operation="file_mmap"
profile="/usr/sbin/dnsmasq//libvirt_leaseshelper"
name="/usr/lib/libvirt/libvirt_leaseshelper" pid=1533 comm="libvirt_leasesh"
requested_mask="m" denied_mask="m" fsuid=0 ouid=0
Note that you can retrigger the operations that trigger this AppArmor
message by running the following command:
$ sudo virsh net-destroy default && sudo virsh net-start default
For the aa.py change in apparmor-utils,
1) Install apparmor-utils
2) Create a file named test.log containing the following denial:
[13622.935258] audit: type=1400 audit(1559071991.542:67):
apparmor="DENIED" operation="exec" profile="xargs" name="/bin/echo"
pid=2950 comm="xargs" requested_mask="x" denied_mask="x" fsuid=1000
ouid=0
3) Run the following command:
$ sudo aa-logprof -f test.log
4) You'll be prompted to make a decision on what to do about the
/bin/echo execute denial. Press (I)nherit.
5) Now press (V)iew Changes. Ensure that the 'm' permission is included
in the added line:
+ /bin/echo mrix,
[Regression Potential]
The dnsmasq profile change adds permissions to the child profile.
There's really no chance of regression involved there.
The aa.py change adds the 'm' permission to the allowed permissions of a
binary on ix transitions. While there is a code change involved, it is a
small change and the resulting profile output involved no risk of
regression.
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