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authorSolar Designer <solar@openwall.com>2006-05-19 02:16:52 -0700
committerDavid S. Miller <davem@davemloft.net>2006-05-19 02:16:52 -0700
commit2c8ac66bb2ff89e759f0d632a27cc64205e9ddd9 (patch)
tree5f0b19841fbe6e49dd17cee6da189dfeea6ff7bf /net
parenta467704dcb4fa45da48079486f1b0e6baffb12d2 (diff)
[NETFILTER]: Fix do_add_counters race, possible oops or info leak (CVE-2006-0039)
Solar Designer found a race condition in do_add_counters(). The beginning of paddc is supposed to be the same as tmp which was sanity-checked above, but it might not be the same in reality. In case the integer overflow and/or the race condition are triggered, paddc->num_counters might not match the allocation size for paddc. If the check below (t->private->number != paddc->num_counters) nevertheless passes (perhaps this requires the race condition to be triggered), IPT_ENTRY_ITERATE() would read kernel memory beyond the allocation size, potentially causing an oops or leaking sensitive data (e.g., passwords from host system or from another VPS) via counter increments. This requires CAP_NET_ADMIN. Signed-off-by: Solar Designer <solar@openwall.com> Signed-off-by: Kirill Korotaev <dev@openvz.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/netfilter/arp_tables.c2
-rw-r--r--net/ipv6/netfilter/ip6_tables.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index c2d92f99a2b..d0d19192026 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -948,7 +948,7 @@ static int do_add_counters(void __user *user, unsigned int len)
write_lock_bh(&t->lock);
private = t->private;
- if (private->number != paddc->num_counters) {
+ if (private->number != tmp.num_counters) {
ret = -EINVAL;
goto unlock_up_free;
}
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 0a673038344..2e72f89a701 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1103,7 +1103,7 @@ do_add_counters(void __user *user, unsigned int len)
write_lock_bh(&t->lock);
private = t->private;
- if (private->number != paddc->num_counters) {
+ if (private->number != tmp.num_counters) {
ret = -EINVAL;
goto unlock_up_free;
}