Full title: issetugid() + rsh + libmalloc OS X Local Root Exploit 
Category: local exploits
Platform: macOS
The default root-suid binary /usr/bin/rsh on Mac OS X uses execv() in an insecure manner. /usr/bin/rsh will invoke /usr/bin/rlogin if launched with only a host argument, without dropping privileges or clearing the environment. This exploit will pass "MallocLogFile" to /usr/bin/rsh, which is then passed on to rlogin and interpreted by libmalloc to create a root-owned file with partially controlled contents at /etc/crontab which gives a rootshell via sudo. Tested on 10.9.5 / 10.10.5 but it most likely works on much older versions too.

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