Messages in this thread | | | Subject | Re: [kernel-hardening] [PATCH v1 1/1] Add Trusted Path Execution as a stackable LSM | From | Matt Brown <> | Date | Sat, 3 Jun 2017 18:30:08 -0400 |
| |
On 06/03/2017 06:39 AM, Jann Horn wrote: > On Sat, Jun 3, 2017 at 7:53 AM, Matt Brown <matt@nmatt.com> wrote: >> This patch was modified from Brad Spengler's Trusted Path Execution (TPE) >> feature in Grsecurity and also incorporates logging ideas from >> cormander's tpe-lkm. >> >> Modifications from the Grsecurity implementation of TPE were made to >> turn it into a stackable LSM using the existing LSM hook bprm_set_creds. >> Also, denial messages were improved by including the full path of the >> disallowed program. (This idea was taken from cormander's tpe-lkm) > [...] >> Threat Models: > [...] >> 2. Attacker on system replaces binary used by a privileged user with a >> malicious one >> >> * This situation arises when administrator of a system leaves a binary >> as world writable. >> >> * TPE is very effective against this threat model > > How do you end up with world-writable binaries in $PATH? >
Sys Admin screw up. It also protects against world-writable binaries anywhere on the system, not just in $PATH.
| |