diff options
Diffstat (limited to 'package/network/services/hostapd/patches/012-EAP-pwd-server-Fix-last-fragment-length-validation.patch')
| -rw-r--r-- | package/network/services/hostapd/patches/012-EAP-pwd-server-Fix-last-fragment-length-validation.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/package/network/services/hostapd/patches/012-EAP-pwd-server-Fix-last-fragment-length-validation.patch b/package/network/services/hostapd/patches/012-EAP-pwd-server-Fix-last-fragment-length-validation.patch new file mode 100644 index 0000000..bfc4c74 --- /dev/null +++ b/package/network/services/hostapd/patches/012-EAP-pwd-server-Fix-last-fragment-length-validation.patch @@ -0,0 +1,51 @@ +From bef802ece03f9ae9d52a21f0cf4f1bc2c5a1f8aa Mon Sep 17 00:00:00 2001 +From: Jouni Malinen <j@w1.fi> +Date: Sun, 1 Nov 2015 18:24:16 +0200 +Subject: [PATCH] EAP-pwd server: Fix last fragment length validation + +All but the last fragment had their length checked against the remaining +room in the reassembly buffer. This allowed a suitably constructed last +fragment frame to try to add extra data that would go beyond the buffer. +The length validation code in wpabuf_put_data() prevents an actual +buffer write overflow from occurring, but this results in process +termination. (CVE-2015-5314) + +Signed-off-by: Jouni Malinen <j@w1.fi> +--- + src/eap_server/eap_server_pwd.c | 6 +++--- + 1 file changed, 3 insertions(+), 3 deletions(-) + +diff --git a/src/eap_server/eap_server_pwd.c b/src/eap_server/eap_server_pwd.c +index cb83ff7..9f787ab 100644 +--- a/src/eap_server/eap_server_pwd.c ++++ b/src/eap_server/eap_server_pwd.c +@@ -970,7 +970,7 @@ static void eap_pwd_process(struct eap_sm *sm, void *priv, + /* + * the first and all intermediate fragments have the M bit set + */ +- if (EAP_PWD_GET_MORE_BIT(lm_exch)) { ++ if (EAP_PWD_GET_MORE_BIT(lm_exch) || data->in_frag_pos) { + if ((data->in_frag_pos + len) > wpabuf_size(data->inbuf)) { + wpa_printf(MSG_DEBUG, "EAP-pwd: Buffer overflow " + "attack detected! (%d+%d > %d)", +@@ -981,6 +981,8 @@ static void eap_pwd_process(struct eap_sm *sm, void *priv, + } + wpabuf_put_data(data->inbuf, pos, len); + data->in_frag_pos += len; ++ } ++ if (EAP_PWD_GET_MORE_BIT(lm_exch)) { + wpa_printf(MSG_DEBUG, "EAP-pwd: Got a %d byte fragment", + (int) len); + return; +@@ -990,8 +992,6 @@ static void eap_pwd_process(struct eap_sm *sm, void *priv, + * buffering fragments so that's how we know it's the last) + */ + if (data->in_frag_pos) { +- wpabuf_put_data(data->inbuf, pos, len); +- data->in_frag_pos += len; + pos = wpabuf_head_u8(data->inbuf); + len = data->in_frag_pos; + wpa_printf(MSG_DEBUG, "EAP-pwd: Last fragment, %d bytes", +-- +1.9.1 + |