bugtraq - Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability

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Date: Tue, 14 Aug 2007 23:03:46 +0200 (CEST)
From: Wojciech Purczynski <cliph@...c.pl>
To: full-disclosure@...ts.grok.org.uk, vulnwatch@...nwatch.org,
	bugtraq@...urityfocus.com
Subject: Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death
 Signal Vulnerability


Small correction - I forgot to add setuid(0) ;)

 	PARENT		CHILD
 	----------------------------------------------------------------
 	fork()
 			prctl(PR_SET_PDEATHSIG)
 			execve("/bin/setuid-binary")
			setuid(0)
 	exit()'ed or killed
 			child receives NO signal this time


 	PARENT		CHILD
 	----------------------------------------------------------------
 	fork()
 			prctl(PR_SET_PDEATHSIG)
 			execve("/bin/setuid-binary")
			setuid(0)
 	execve("/bin/setuid-binary")
 	exit()'ed or killed
 			privileged process receives the signal