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authorMark H Weaver <mhw@netris.org>2015-07-08 18:18:40 -0400
committerMark H Weaver <mhw@netris.org>2015-07-08 18:27:37 -0400
commit9fb00f383dd7df97adf8bc603eeaa7be4e901bbd (patch)
treec1c07a30ebd4f50e04eac5a530317ab8b762a66d /gnu
parent16de69c950c473cc3d386cd7569bd1d6051614b6 (diff)
gnu: wpa-supplicant: Fix WPS and P2P NFC NDEF record payload length validation.
* gnu/packages/patches/wpa-supplicant-2015-5-fix.patch: New file. * gnu-system.am (dist_patch_DATA): Add it. * gnu/packages/admin.scm (wpa-supplicant-light)[source]: Add patch.
Diffstat (limited to 'gnu')
-rw-r--r--gnu/packages/admin.scm3
-rw-r--r--gnu/packages/patches/wpa-supplicant-2015-5-fix.patch64
2 files changed, 66 insertions, 1 deletions
diff --git a/gnu/packages/admin.scm b/gnu/packages/admin.scm
index 58f9ce507d..c96e11635b 100644
--- a/gnu/packages/admin.scm
+++ b/gnu/packages/admin.scm
@@ -705,7 +705,8 @@ commands and their arguments.")
"wpa-supplicant-2015-4-fix-pt2.patch"
"wpa-supplicant-2015-4-fix-pt3.patch"
"wpa-supplicant-2015-4-fix-pt4.patch"
- "wpa-supplicant-2015-4-fix-pt5.patch")))))
+ "wpa-supplicant-2015-4-fix-pt5.patch"
+ "wpa-supplicant-2015-5-fix.patch")))))
(build-system gnu-build-system)
(arguments
'(#:phases (alist-replace
diff --git a/gnu/packages/patches/wpa-supplicant-2015-5-fix.patch b/gnu/packages/patches/wpa-supplicant-2015-5-fix.patch
new file mode 100644
index 0000000000..496c68ff8e
--- /dev/null
+++ b/gnu/packages/patches/wpa-supplicant-2015-5-fix.patch
@@ -0,0 +1,64 @@
+Original patch copied from http://w1.fi/security/2015-5/
+and then backported to wpa-supplicant-2.4.
+
+From df9079e72760ceb7ebe7fb11538200c516bdd886 Mon Sep 17 00:00:00 2001
+From: Jouni Malinen <j@w1.fi>
+Date: Tue, 7 Jul 2015 21:57:28 +0300
+Subject: [PATCH] NFC: Fix payload length validation in NDEF record parser
+
+It was possible for the 32-bit record->total_length value to end up
+wrapping around due to integer overflow if the longer form of payload
+length field is used and record->payload_length gets a value close to
+2^32. This could result in ndef_parse_record() accepting a too large
+payload length value and the record type filter reading up to about 20
+bytes beyond the end of the buffer and potentially killing the process.
+This could also result in an attempt to allocate close to 2^32 bytes of
+heap memory and if that were to succeed, a buffer read overflow of the
+same length which would most likely result in the process termination.
+In case of record->total_length ending up getting the value 0, there
+would be no buffer read overflow, but record parsing would result in an
+infinite loop in ndef_parse_records().
+
+Any of these error cases could potentially be used for denial of service
+attacks over NFC by using a malformed NDEF record on an NFC Tag or
+sending them during NFC connection handover if the application providing
+the NDEF message to hostapd/wpa_supplicant did no validation of the
+received records. While such validation is likely done in the NFC stack
+that needs to parse the NFC messages before further processing,
+hostapd/wpa_supplicant better be prepared for any data being included
+here.
+
+Fix this by validating record->payload_length value in a way that
+detects integer overflow. (CID 122668)
+
+Signed-off-by: Jouni Malinen <j@w1.fi>
+---
+ src/wps/ndef.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/src/wps/ndef.c b/src/wps/ndef.c
+index 5604b0a..50d018f 100644
+--- a/src/wps/ndef.c
++++ b/src/wps/ndef.c
+@@ -48,6 +48,8 @@ static int ndef_parse_record(const u8 *data, u32 size,
+ if (size < 6)
+ return -1;
+ record->payload_length = ntohl(*(u32 *)pos);
++ if (record->payload_length > size - 6)
++ return -1;
+ pos += sizeof(u32);
+ }
+
+@@ -68,7 +70,8 @@ static int ndef_parse_record(const u8 *data, u32 size,
+ pos += record->payload_length;
+
+ record->total_length = pos - data;
+- if (record->total_length > size)
++ if (record->total_length > size ||
++ record->total_length < record->payload_length)
+ return -1;
+ return 0;
+ }
+--
+1.9.1
+