An interim report from an independent commission investigating the allegations also seriously undermined the credibility of the former UN official in charge of the programme, Benan Sevan, saying he repeatedly made unethical requests to Iraq to award oil export contracts to a single oil company.
The chairman of the commission, Paul Volcker, a former chairman of the US Federal Reserve, said that the interim report was "not the whole story by any long shot", however. A final report in the summer will try to identify what financial gain, if any, Mr Sevan received - which could imply straight bribes - and to resolve questions still surrounding Kojo Annan, the son of the current UN secretary general, Kofi Annan.
The 200-page report, issued last night, already describes a catalogue of lapses and shortcomings in the way the $64bn (pounds 34bn) programme was managed by the UN under both Mr Boutros-Ghali and Mr Annan. So far, however, Mr Volcker has not offered any evidence of actual corruption punishable by criminal charges.
The oil-for-food programme was designed to allow Iraq to export limited amounts of fuel to generate proceeds for the purchase of urgent humanitarian goods. Almost as soon as it was wound up in 2003 after the US-led war against Saddam Hussein, allegations began to surface that scores of individuals around the world had illegally benefited from the scheme to the tune of many millions of dollars.
The interim report focused on three specific problem areas, Mr Volcker said. Many pages are dedicated to describing how Mr Sevan "created a grave and continuing conflict of interest" for himself, specifically by repeatedly soliciting Iraqi officials to award oil export allocations to small oil trading firm run out of Switzerland called African Middle East Petroleum (Amep).
Mr Volcker contends, moreover, that under questioning by his investigators, Mr Sevan tried to deny any improper activities on behalf of Amep or making such requests to Baghdad. But the report states that "ample evidence" was found to suggest that Mr Sevan was not being candid.
Mr Sevan last night fired back, saying the panel had "succumbed to massive political pressure and now seeks to scapegoat" him.
Also highlighted are alleged violations of the rules of procurement, when the UN chose the three principle contractors to get the programme up and running in 1996. This was when Mr Boutros-Ghali was still UN secretary general - and Mr Volcker confirmed last night that he has been approached by the commission more than once to offer explanations.
The companies that awarded those contracts were the Banque National de Paris, to help handle the flow of funds, the engineering company Saybolt Eastern Hemisphere and London-based Lloyd's Register Inspection Limited, the firm chosen to oversee the delivery to Iraq of the humanitarian supplies.
The report also says that there was direct and improper contact between the UN official guiding the awarding of contracts and the British mission.
The choice of BNP bank of Paris was "clearly affected by political considerations", Mr Volcker said, adding that Mr Boutros-Ghali had already been responding to questions in this regard. He noted that Iraq at the time "would not sit still for an American or British bank" while the Americans, he added, had made clear they did not want a Swiss bank involved.
Not addressed in the report are possible additional connections between the oil trading company aided by Mr Sevan and Mr Boutros-Ghali. It has been reported that the man running Amep is a cousin of the former secretary general.
Still to come is further scrutiny of the part played in the affair by Kojo Annan, who has already acknowledged that he worked for a company that benefited directly from the programme and continued to draw a salary from the company some years after ceasing working for it.
Mr Volcker was clear last night that his investigators "had not found systematic misuse of funds dedicated to the running of the programme in the UN", which will offer some consolation to worried UN officials.
He added the continuing investigation was "a painful episode, I think, for everybody in the life of the UN".Reuse content