[SRU][Trusty][Zesty][PATCH 1/1] nl80211: check for the required netlink attributes presence
Kleber Sacilotto de Souza
kleber.souza at canonical.com
Wed Dec 6 09:54:58 UTC 2017
From: Vladis Dronov <vdronov at redhat.com>
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 at vger.kernel.org> # v3.1-rc1
Reported-by: bo Zhang <zhangbo5891001 at gmail.com>
Signed-off-by: Vladis Dronov <vdronov at redhat.com>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
CVE-2017-12153
(cherry picked from commit e785fa0a164aa11001cba931367c7f94ffaff888)
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>
---
net/wireless/nl80211.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 0df8023f480b..fbd5593e88cb 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -10903,6 +10903,9 @@ 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)
--
2.14.1
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