I don't see it as an "aura", more as an almost sentient being, that is capable of subtly pulling at people's desires - Tolkien writes that Sauron transferred his will to dominate and his malice into the ring, along with most of his power, so it makes sense to me that it would be capable of playing an active role in corrupting people, not just as some "blanket AoE curse".

For Boromir the ring acted as a psychological amplification of his own noble but desperate intentions. The Ring didnt create evil feelings out of nothing; instead, it acted as a corrupting mirror for his existing burdens.

It briefly did the same to Gandalf and Galadriel, but thankfully both were able to resist its pull - maybe carrying a ring of power themselves helped them...