Public bug reported:
[Impact]
>From the config option description:
Historically the kernel has allowed TIOCSTI, which will push
characters into a controlling TTY. This continues to be used
as a malicious privilege escalation mechanism, and provides no
meaningful real-world utility any more. Its use is considered
a dangerous legacy operation, and can be disabled on most
systems.
[Test case]
Test that TIOCSTI is not allowed by unprivileged user, while still allowed by
CAP_SYS_ADMIN.
[Potential regression]
Programs relying on TIOCSTI may break.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2046192
Title:
Disable Legacy TIOCSTI
Status in linux package in Ubuntu:
In Progress
Bug description:
[Impact]
From the config option description:
Historically the kernel has allowed TIOCSTI, which will push
characters into a controlling TTY. This continues to be used
as a malicious privilege escalation mechanism, and provides no
meaningful real-world utility any more. Its use is considered
a dangerous legacy operation, and can be disabled on most
systems.
[Test case]
Test that TIOCSTI is not allowed by unprivileged user, while still allowed by
CAP_SYS_ADMIN.
[Potential regression]
Programs relying on TIOCSTI may break.
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