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.
https://security.netapp.com/advisory/ntap-20180628-0001/
https://security.gentoo.org/glsa/201612-18
https://security-tracker.debian.org/tracker/CVE-2015-8325
https://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-8325.html
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://bugzilla.redhat.com/show_bug.cgi?id=1328012
https://anongit.mindrot.org/openssh.git/commit/?id=85bdcd7c92fe7ff133bbc4e10a65c91810f88755
http://www.securitytracker.com/id/1036487
http://www.securityfocus.com/bid/86187
http://www.debian.org/security/2016/dsa-3550