Date: Wed, 11 Nov 2009 18:59:24 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Damian Weber <dweber@htw-saarland.de> Cc: freebsd-security@freebsd.org, wkoszek@freebsd.org, Oliver Pinter <oliver.pntr@gmail.com> Subject: Re: 2009-07-20 FreeBSD 7.2 (pecoff executable) Local Denial of Service Exploit 23 R D Shaun Colley Message-ID: <20091111185811.P37440@maildrop.int.zabbadoz.net> In-Reply-To: <alpine.BSF.2.00.0911111909340.60404@magritte.htw-saarland.de> References: <6101e8c40907201008n62eeec05r6670a79698bc2ac7@mail.gmail.com> <20091111173311.T37440@maildrop.int.zabbadoz.net> <alpine.BSF.2.00.0911111909340.60404@magritte.htw-saarland.de>
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On Wed, 11 Nov 2009, Damian Weber wrote: > > > On Wed, 11 Nov 2009, Bjoern A. Zeeb wrote: > >> Date: Wed, 11 Nov 2009 17:37:50 +0000 (UTC) >> From: Bjoern A. Zeeb <bzeeb-lists@lists.zabbadoz.net> >> To: Oliver Pinter <oliver.pntr@gmail.com> >> Cc: freebsd-security@freebsd.org, wkoszek@freebsd.org >> Subject: Re: 2009-07-20 FreeBSD 7.2 (pecoff executable) Local Denial of >> Service Exploit 23 R D Shaun Colley >> >> On Mon, 20 Jul 2009, Oliver Pinter wrote: >> >> Hi, >> >>> http://milw0rm.com/exploits/9206 >> >> has anyone actually been able to reproduce a problem scenario with >> this on any supported releases (7.x or 6.x)? >> >> The only thing I gould get from that was: >> execve returned -1, errno=8: Exec format error >> > > FWIW, I got another result on 6.4-STABLE > > FreeBSD mymachine.local 6.4-STABLE FreeBSD 6.4-STABLE #6: Sat Oct 3 13:06:12 CEST 2009 root@hypercrypt.local:/usr/obj/usr/src/sys/MYMACHINE i386 > > $ ./pecoff > MZaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaîîîîaaaa > [I'm truncating here, ~3500 a's follow]aaaaa: File name too long Not sure if you'd see it with ktrace or not; I ran into that with my tests as well and was told that it's a shell problem. try to run it from this: ------------------------------------------------------------------------ #include <unistd.h> #include <err.h> int main(int argc, char *argv[]) { if (execl("./pecoff", "./pecoff", NULL) == -1) err(1, "execl()"); return (0); } ------------------------------------------------------------------------ /bz -- Bjoern A. Zeeb It will not break if you know what you are doing.
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