View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2016-5237 medium priority: Ubuntu including 1 source packages (steam), 5 status rows across 5 suites (precise, trusty, upstream, xenial, yakkety): DNE 2, not-affected 2, needs-triage 1.
Valve Steam 3.42.16.13 uses weak permissions for the files in the Steam program directory, which allows local users to modify the files and possibly gain privileges as demonstrated by a Trojan horse Steam.exe file.