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[NETFILTER]: Missing check for CAP_NET_ADMIN in iptables compat layer

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The 32bit compatibility layer has no CAP_NET_ADMIN check in
compat_do_ipt_get_ctl, which for example allows to list the current
iptables rules even without having that capability (the non-compat
version requires it). Other capabilities might be required to exploit
the bug (eg. CAP_NET_RAW to get the nfnetlink socket?), so a plain user
can't exploit it, but a setup actually using the posix capability system
might very well hit such a constellation of granted capabilities.

Signed-off-by: Björn Steinbrink <B.Steinbrink@gmx.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Björn Steinbrink 2006-10-20 00:21:10 -07:00 committed by David S. Miller
parent 206daaf77f
commit 82fac0542e
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/netfilter/ip_tables.c
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@ -1932,6 +1932,9 @@ compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
{
int ret;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
switch (cmd) {
case IPT_SO_GET_INFO:
ret = get_info(user, len, 1);