Author: nbd Date: 2015-05-06 11:45:39 +0200 (Wed, 06 May 2015) New Revision: 45619
Added: trunk/package/network/services/hostapd/patches/002-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch Log: hostapd: fix remote denial of service vulnerability in WMM action frame parsing Signed-off-by: Felix Fietkau <[email protected]> Added: trunk/package/network/services/hostapd/patches/002-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch =================================================================== --- trunk/package/network/services/hostapd/patches/002-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch (rev 0) +++ trunk/package/network/services/hostapd/patches/002-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch 2015-05-06 09:45:39 UTC (rev 45619) @@ -0,0 +1,36 @@ +From ef566a4d4f74022e1fdb0a2addfe81e6de9f4aae Mon Sep 17 00:00:00 2001 +From: Jouni Malinen <[email protected]> +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 <[email protected]> +--- + src/ap/wmm.c | 3 +++ + 1 file changed, 3 insertions(+) + +--- a/src/ap/wmm.c ++++ b/src/ap/wmm.c +@@ -274,6 +274,9 @@ void hostapd_wmm_action(struct hostapd_d + 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, _______________________________________________ openwrt-commits mailing list [email protected] https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-commits
