Date: Fri, 27 Aug 2010 13:32:55 +0200 From: Pieter de Boer <pieter@thelostparadise.com> To: vadim_nuclight@mail.ru Cc: freebsd-security@freebsd.org Subject: Re: tcpdump -z Message-ID: <4C77A267.10102@thelostparadise.com> In-Reply-To: <slrni7eu1h.21lb.vadim_nuclight@kernblitz.nuclight.avtf.net> References: <slrni7eu1h.21lb.vadim_nuclight@kernblitz.nuclight.avtf.net>
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On 08/27/2010 10:32 AM, Vadim Goncharov wrote: > This is a froward message from tcpdump-workers mail list: > === 8< ================>8 === > $ sudo ./tcpdump -i any -G 1 -z ./test.sh -w dump port 55555 > [sudo] password for user: > tcpdump: listening on any, link-type LINUX_SLL (Linux cooked), capture size > 65535 bytes > (generate some traffic on port 55555) > root@blaa ~/temp/tcpdump-4.1.1$ id > uid=0(root) gid=0(root) groups=0(root) > > Is this known and accepted? Could this option maybe be implemented > differently? In my opinion, if you allow people to run tools as root using sudo, you'd better make sure those tools don't allow attackers to easily gain root access. In the case of tcpdump, the '-w' flag most probably already allowed that, although '-z' is a bit more convenient to the attacker. As a solution, configure your sudo correctly, only allowing specific tcpdump command line options (or option sets) to be used. -- Pieter
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