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Such local privilege escalation vulnerabilities can also pose a serious threat to server host providers because one customer can exploit the flaw to gain control over other customer processes running on the same server. Qualys said it's also possible that Stack Clash could be exploited in a way that allows it to remotely execute code directly.
"This is a fairly straightforward way to get root after you've already gotten some sort of user-level access," Jimmy Graham, director of product management at Qualys, told Ars. The attack works by causing a region of computer memory known as the stack to collide into separate memory regions that store unrelated code or data. "The concept isn't new, but this specific exploit is definitely new." "Stack Clash" Privilege Escalation Bug in Unix Operating Systems [arstechnica.com]
joined:Apr 25, 2002
as of this writing on June 19, 2017, we do not know of any remotely exploitable application. However, remote exploitation of the Stack Clash is not excluded; although local exploitation will always be easier, and remote exploitation will be very application-specific. The one remote application that we did investigate (the Exim mail server) turned out to be unexploitable by sheer luck.