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Description of problem:
 Currently gnutls uses getenv() to obtain some environment variables. These variables seem harmless (c.f. the fedora bug [0]), but there is not clear threat model for an attack on a set-uid binary, and any deviation from standard execution could be significant for an attack. For that, it may be better to be on the safe side rather than being sorry. For that secure_getenv() should be used in all instances where getenv() is being called.

I've included this change already in upstream code:
https://gitlab.com/gnutls/gnutls/commit/b0a3048e56611a2deee4976aeba3b8c0740655a6

[0]. https://bugzilla.redhat.com/show_bug.cgi?id=1343505

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2218.html