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Subject[patch 02/23] NETFILTER: Missing check for CAP_NET_ADMIN in iptables compat layer
-stable review patch.  If anyone has any objections, please let us know.
From: Patrick McHardy <>

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 <>
Signed-off-by: Patrick McHardy <>
Signed-off-by: David S. Miller <>
Signed-off-by: Chris Wright <>

commit 4410392a8258fd972fc08a336278b14c82b2774f
tree 567261d003b2a8fb08c2d89d0d708dd06f357f49
parent b4d854665eafe32b48e0eecadb91a73f6eea0055
author Patrick McHardy <> Fri, 17 Nov 2006 06:22:07 +0100
committer Patrick McHardy <> Fri, 17 Nov 2006 06:22:07 +0100
net/ipv4/netfilter/ip_tables.c | 3 +++
1 file changed, 3 insertions(+)
--- linux-
+++ linux-
@@ -1994,6 +1994,9 @@ compat_do_ipt_get_ctl(struct sock *sk, i
int ret;

+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
switch (cmd) {
ret = get_info(user, len, 1);
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