wpa-supplicant: Fix CVE-2015-4142
wpa-supplicant: backport patch to fix CVE-2015-4142 Backport patch to fix CVE-2015-4142. This patch is originally from: http://w1.fi/security/2015-3/0001-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch (From OE-Core rev: 61f2a6a18dcda22d7b0e236f9150674bff2764a7) Signed-off-by: Fan Xin <fan.xin@jp.fujitsu.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
parent
63873d02c0
commit
563269fd1e
|
@ -0,0 +1,45 @@
|
|||
Upstream-Status: Backport
|
||||
|
||||
Signed-off-by: Fan Xin <fan.xin@jp.fujitsu.com>
|
||||
|
||||
From ef566a4d4f74022e1fdb0a2addfe81e6de9f4aae Mon Sep 17 00:00:00 2001
|
||||
From: Jouni Malinen <j@w1.fi>
|
||||
Date: Wed, 29 Apr 2015 02:21:53 +0300
|
||||
Subject: [PATCH] AP WMM: Fix integer underflow in WMM Action frame parser
|
||||
|
||||
The length of the WMM Action frame was not properly validated and the
|
||||
length of the information elements (int left) could end up being
|
||||
negative. This would result in reading significantly past the stack
|
||||
buffer while parsing the IEs in ieee802_11_parse_elems() and while doing
|
||||
so, resulting in segmentation fault.
|
||||
|
||||
This can result in an invalid frame being used for a denial of service
|
||||
attack (hostapd process killed) against an AP with a driver that uses
|
||||
hostapd for management frame processing (e.g., all mac80211-based
|
||||
drivers).
|
||||
|
||||
Thanks to Kostya Kortchinsky of Google security team for discovering and
|
||||
reporting this issue.
|
||||
|
||||
Signed-off-by: Jouni Malinen <j@w1.fi>
|
||||
---
|
||||
src/ap/wmm.c | 3 +++
|
||||
1 file changed, 3 insertions(+)
|
||||
|
||||
diff --git a/src/ap/wmm.c b/src/ap/wmm.c
|
||||
index 6d4177c..314e244 100644
|
||||
--- a/src/ap/wmm.c
|
||||
+++ b/src/ap/wmm.c
|
||||
@@ -274,6 +274,9 @@ void hostapd_wmm_action(struct hostapd_data *hapd,
|
||||
return;
|
||||
}
|
||||
|
||||
+ if (left < 0)
|
||||
+ return; /* not a valid WMM Action frame */
|
||||
+
|
||||
/* extract the tspec info element */
|
||||
if (ieee802_11_parse_elems(pos, left, &elems, 1) == ParseFailed) {
|
||||
hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
|
||||
--
|
||||
1.9.1
|
||||
|
Loading…
Reference in New Issue