X-RDate: Thu, 12 Mar 1998 09:26:06 +0500 (ESK)
Date: Mon, 9 Mar 1998 17:55:14 -0600
From: "Mark A. Spencer" <[email protected]>
To: [email protected]Subject: [linux-security] *sigh* another RH5 /tmp problem
RedHat 5, when using dhcp to configure the interface calls a script
called "ifdhcpc-done" to be executed after a dhcp interface is
configured. At the end of the process it updates resolv.conf:
if [ -f /etc/dhcpc/resolv.conf ]; then
echo "setting up resolv.conf" >> /tmp/dhcplog
cp /etc/dhcpc/resolv.conf /etc
fi
There is no protection against the dhcplog file being a symbolic link,
clobbering, blah de blah de blah... (it seems pretty useless to maintain
it too, since this is the only message that ever seems to appear in the
log).
-rw-rw-rw- 1 root root 690 Mar 9 17:23 dhcplog
Oh, and the file also seems to default to being permissions of 666 which
allows for easy avoidance of disk quotas...
Anyway, I would just comment out the echo line and be done
The only way to exploit this is if the dhcplog file doesn't already exist
which can occur if the system has been up for 10 days or more and is then
rebooted.
-Mark
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