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Date: Wed, 15 Mar 2023 09:26:24 +0000
From: Casper Dik <casper.dik@...cle.com>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: Re: TTY pushback vulnerabilities / TIOCSTI
>On Wed, 15 Mar 2023, Fabian Keil wrote:
>> In ElectroBSD I removed TIOCSTI support in 2017 [0] and haven't noticed
>> any problems.
>I hate tossing out functionality; would you not make it a privileged
>operation instead?
>-- Dave
I think it makes it mostly useless.
In Solaris we've changed how TIOCSTI works; when a process reads the
packet with the stuffed input, it then checks the credential of the
sender. So while the stuffed input is still echoed but ignored:
# su nobody -c tiocsti
exit
echo Payload as `whoami`
#
But when having root calling tciosti, you get:
# su root -c tiocsti
exit
echo Payload as `whoami`
# exit
Payload as root
(The exit here is not needed)
Casper
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