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Date: Wed, 1 Nov 2017 22:17:19 +0100 From: Willy Tarreau <w@....eu> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, linux@...ck-us.net Cc: Vladis Dronov <vdronov@...hat.com>, Johannes Berg <johannes.berg@...el.com>, Willy Tarreau <w@....eu> Subject: [PATCH 3.10 019/139] nl80211: check for the required netlink attributes presence From: Vladis Dronov <vdronov@...hat.com> commit e785fa0a164aa11001cba931367c7f94ffaff888 upstream. nl80211_set_rekey_data() does not check if the required attributes NL80211_REKEY_DATA_{REPLAY_CTR,KEK,KCK} are present when processing NL80211_CMD_SET_REKEY_OFFLOAD request. This request can be issued by users with CAP_NET_ADMIN privilege and may result in NULL dereference and a system crash. Add a check for the required attributes presence. This patch is based on the patch by bo Zhang. This fixes CVE-2017-12153. References: https://bugzilla.redhat.com/show_bug.cgi?id=1491046 Fixes: e5497d766ad ("cfg80211/nl80211: support GTK rekey offload") Cc: <stable@...r.kernel.org> Reported-by: bo Zhang <zhangbo5891001@...il.com> Signed-off-by: Vladis Dronov <vdronov@...hat.com> Signed-off-by: Johannes Berg <johannes.berg@...el.com> Signed-off-by: Willy Tarreau <w@....eu> --- net/wireless/nl80211.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index dd3dbed8..32c5443 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -8010,6 +8010,9 @@ static int nl80211_set_rekey_data(struct sk_buff *skb, struct genl_info *info) if (err) return err; + if (!tb[NL80211_REKEY_DATA_REPLAY_CTR] || !tb[NL80211_REKEY_DATA_KEK] || + !tb[NL80211_REKEY_DATA_KCK]) + return -EINVAL; if (nla_len(tb[NL80211_REKEY_DATA_REPLAY_CTR]) != NL80211_REPLAY_CTR_LEN) return -ERANGE; if (nla_len(tb[NL80211_REKEY_DATA_KEK]) != NL80211_KEK_LEN) -- 2.8.0.rc2.1.gbe9624a
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