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2
votes
1answer
412 views

How does Magisk on Android work as su without setuid and capabilities?

I've read in another answer that on Android the su binaries avoid needing to be setuid by using filesystem capabilities like cap_setuid. But then I tried to check this, and to my surprise, I found no ...
6
votes
1answer
613 views

How do I run a process that wants to become root from a systemd service which is a regular user?

I have a service that I start using systemd. The service user and group are changed to a non-privileged user. [Service] ... User=regular_user Group=regular_user ... At some point the service needs ...
4
votes
1answer
769 views

Security of capabilities vs setuid (LD_PRELOAD, etc)

I know that if a process is run setuid that it's protected against various things that could subvert the process, like LD_PRELOAD and ptrace (debugging). But I haven't been able to find anything on ...
6
votes
1answer
568 views

Why doesn't Ubuntu use capabilities on ping?

After running, $ ls -l /bin/ping -rwsr-xr-x 1 root root 34740 Nov 5 2012 /bin/ping I wonder, why doesn't Ubuntu use capabilities (i.e. raw sockets) rather than setuid?
1
vote
1answer
496 views

Principle of least privilege: Does Authbind helper really need setuid root, or can it run with cap_net_bind_services?

Does Authbind's helper really need setuid root, or can it run with the CAP_NET_BIND_SERVICES capability and still work?
5
votes
1answer
3k views

How to replace setuid with file-system capabilities

Inspired by this question here is the follow-up: As some of you may know setuid-binaries are dangerous, since some exploits use these to escalate their rights up to root. Now it seems that there has ...