Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: policykit-1 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1784964
Title:
Regression due to CVE-2018-1116 (processes not inheriting user ID or
groups )
Status in policykit-1 package in Ubuntu:
Confirmed
Bug description:
This report is tracking a possible regression caused by the recent
CVE-2018-1116 patches to policykit-1.
On 18.04, since package upgrades on July 23rd, and after the first
reboot since then on Aug 1st, I hit an issue with the primary (sudo,
adm, etc...) user getting Permission Denied trying to do:
tail -f /var/log/syslog
when that file is owned by syslog:adm and is g=r.
I then found that "groups" reports only the $USER and not the entire
list, but "groups $USER" reports all the groups correctly.
The user shell is set to /usr/bin/tmux and /etc/tmux.conf has "set -g
default-shell /bin/bash"
After changing the user's shell back to /bin/bash and logging in on
tty1 the list of groups shows correctly for the /bin/bash process
running on tty1.
I investigated and found that for the affected processes, such as the
tmux process, /proc/$PID/loginuid = 4294967295 whereas the /bin/bash
process on tty1 correctly reported 1000. The same with the respective
gid_map and uid_map.
4294967295 == -1 == 0xFFFFFFFF
The recent CVE patch to policykit has several functions where it does
"uid = -1" which seems to tie in to my findings so far.
I also noticed Ubuntu is still based on version 0.105 which was
released in 2012 - upstream released 0.115 with the CVE patch.
I suspect the backporting has missed something.
The Ubuntu backport patch is:
https://git.launchpad.net/ubuntu/+source/policykit-1/commit/?h=applied/ubuntu
/bionic-devel&id=840c50182f5ab1ba28c1d20cce4c207364852935
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