The controversy over whether Sebastian Vettel made an illegal pass under yellow on Jean-Eric Vergne is finally, officially over. After a letter from FerrariFerrariItaly, 1947 > present233 models
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asking the FIA for clarification yesterday, the FIA ruled that the pass was legal. 

According to the explanation, a corner worker had begun waving a green flag at the corner, but the light for the corner was still yellow because it had not been switched over yet. 

In a brief press statement Ferrari said: "Ferrari duly takes note of the reply sent by the FIA this morning and therefore considers the matter now closed."

According to the FIA, the reason that the incident was not initially reported to race control is that the corner worker was there waving a green flag. To them, there was nothing to investigate, and the corner worker did not report any problem. 

Source: Autosport