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nl80211: check for the required netlink attributes presence
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.
Change-Id: Ia6ce5dd03a88412020e47a681cb75f4e8c1aafd8
References: https://bugzilla.redhat.com/show_bug.cgi?id=1491046
Fixes: e5497d766a
("cfg80211/nl80211: support GTK rekey offload")
Reported-by: bo Zhang <zhangbo5891001@gmail.com>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
parent
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@ -8305,6 +8305,9 @@ static int nl80211_set_rekey_data(struct sk_buff *skb, struct genl_info *info)
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if (err)
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return err;
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if (!tb[NL80211_REKEY_DATA_REPLAY_CTR] || !tb[NL80211_REKEY_DATA_KEK] ||
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!tb[NL80211_REKEY_DATA_KCK])
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return -EINVAL;
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if (nla_len(tb[NL80211_REKEY_DATA_REPLAY_CTR]) != NL80211_REPLAY_CTR_LEN)
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return -ERANGE;
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if (nla_len(tb[NL80211_REKEY_DATA_KEK]) != NL80211_KEK_LEN)
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