main/hostapd: fix CVE-2012-4445

fixes #1428

1 files changed, 45 insertions, 0 deletions

diff --git a/main/hostapd/CVE-2012-4445.patch b/main/hostapd/CVE-2012-4445.patch
new file mode 100644
index 000000000..552307d27
--- /dev/null
+++ b/main/hostapd/CVE-2012-4445.patch
@@ -0,0 +1,45 @@
+From: Jouni Malinen <j@w1.fi>
+Date: Sun, 7 Oct 2012 17:06:29 +0000 (+0300)
+Subject: EAP-TLS server: Fix TLS Message Length validation
+X-Git-Url: http://w1.fi/gitweb/gitweb.cgi?p=hostap.git;a=commitdiff_plain;h=586c446e0ff42ae00315b014924ec669023bd8de
+
+EAP-TLS server: Fix TLS Message Length validation
+
+EAP-TLS/PEAP/TTLS/FAST server implementation did not validate TLS
+Message Length value properly and could end up trying to store more
+information into the message buffer than the allocated size if the first
+fragment is longer than the indicated size. This could result in hostapd
+process terminating in wpabuf length validation. Fix this by rejecting
+messages that have invalid TLS Message Length value.
+
+This would affect cases that use the internal EAP authentication server
+in hostapd either directly with IEEE 802.1X or when using hostapd as a
+RADIUS authentication server and when receiving an incorrectly
+constructed EAP-TLS message. Cases where hostapd uses an external
+authentication are not affected.
+
+Thanks to Timo Warns for finding and reporting this issue.
+
+Signed-hostap: Jouni Malinen <j@w1.fi>
+intended-for: hostap-1
+---
+
+diff --git a/src/eap_server/eap_server_tls_common.c b/src/eap_server/eap_server_tls_common.c
+index 31be2ec..46f282b 100644
+--- a/src/eap_server/eap_server_tls_common.c
++++ b/src/eap_server/eap_server_tls_common.c
+@@ -228,6 +228,14 @@ static int eap_server_tls_process_fragment(struct eap_ssl_data *data,
+ 			return -1;
+ 		}
+ 
++		if (len > message_length) {
++			wpa_printf(MSG_INFO, "SSL: Too much data (%d bytes) in "
++				   "first fragment of frame (TLS Message "
++				   "Length %d bytes)",
++				   (int) len, (int) message_length);
++			return -1;
++		}
++
+ 		data->tls_in = wpabuf_alloc(message_length);
+ 		if (data->tls_in == NULL) {
+ 			wpa_printf(MSG_DEBUG, "SSL: No memory for message");