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This helper/exploit injects "id -u -n\n" to the vulnerable calling terminal.
Use id -u -n to get a reproducible output of test cases based on it.
What can happen:
Nothing, no exploit: pty is not accessible, sedsid() disconnected the task from
pty, TIOCSTI failed.
The command is injected to the unprivileged environment pty, and you see e. g.
"nobody": This is acceptable.
The command is injected to the caller (privileged) pty, and you see "root" (or
caller uid name): This is not acceptable and has security implications.
References:
CVE-2016-2779
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2779
http://seclists.org/oss-sec/2016/q1/448
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=815922
https://bugzilla.redhat.com/show_bug.cgi?id=173008
https://bugzilla.suse.com/show_bug.cgi?id=968674
https://bugzilla.suse.com/show_bug.cgi?id=968675
CVE-2016-2781
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2781
http://seclists.org/oss-sec/2016/q1/452
Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>
Cc: Federico Bento <up201407890@alunos.dcc.fc.up.pt>
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