The do_setup_env function in session.c in sshd in OpenSSH through 7.2p2, when the UseLogin feature is enabled and PAM is configured to read .pam_environment files in user home directories, allows local users to gain privileges by triggering a crafted environment for the /bin/login program, as demonstrated by an LD_PRELOAD environment variable.
rhn.redhat.com/errata/RHSA-2016-2588.html
rhn.redhat.com/errata/RHSA-2017-0641.html
www.debian.org/security/2016/dsa-3550
www.securityfocus.com/bid/86187
www.securitytracker.com/id/1036487
anongit.mindrot.org/openssh.git/commit/?id=85bdcd7c92fe7ff133bbc4e10a65c91810f88755
bugzilla.redhat.com/show_bug.cgi?id=1328012
cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-8325.html
security-tracker.debian.org/tracker/CVE-2015-8325
security.gentoo.org/glsa/201612-18
security.netapp.com/advisory/ntap-20180628-0001/