bugtraq - Re: hard links on Linux create local DoS vulnerability and security problems

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Message-ID: <200311241947.hAOJlru26765@panix5.panix.com>
Date: Mon, 24 Nov 2003 14:47:53 -0500 (EST)
From: Seth Breidbart <sethb@...ix.com>
To: bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com
Subject: Re: hard links on Linux create local DoS vulnerability and security problems

> I think that your observation of the ability to keep a security hole open is
> very interesting, but, fortunately, it should be moot.

Even if not, it's easily avoidable: when you replace a setuid program,
truncate the existing file first, then chmod 000, then delete it.

The security hole only remains if you merely delete it.

Seth

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