Version: all (see note below) Hardware: all Operating system: Debian GNU Linux (but all should be affected) Compiler: gcc
Hi In CVE-2016-7543 a problem was reported that it is possible to privilege escalate to root. The correction as seen here http://lists.gnu.org/archive/html/bug-bash/2016-10/msg00009.html is not complete. Well it do prevent privilege escalation to root, but it is possible to escalate to any other user and that may be bad too. The problem has also been reported (by me) in Debian as you can see here: http://bugs.debian.org/841856 I have attached a tar file with exploit code. The exploit code is used like this: make sudo make root make test Test 1 is the exploit for CVE-2016-7543 Test 2 is the exploit for this problem Test 3 is just a reference test. The proposed patch essentially disable the whole PS4 variable support for all users (not only root as the patch was for CVE-2016-7543. Please let me know if you have a better idea on how to handle this. Version note: The attached correction is made on a 4.2 system with a patch for CVE-2016-7543. However it should apply on 4.4 as well. Let me know if you need any further details. Best regards // Ola -- --- Inguza Technology AB --- MSc in Information Technology ---- / o...@inguza.com Folkebogatan 26 \ | o...@debian.org 654 68 KARLSTAD | | http://inguza.com/ Mobile: +46 (0)70-332 1551 | \ gpg/f.p.: 7090 A92B 18FE 7994 0C36 4FE4 18A1 B1CF 0FE5 3DD9 / ---------------------------------------------------------------
exploit.tar.gz
Description: GNU Zip compressed data
CVE-2016-7543-bug-841856-20161023.patch
Description: Binary data
