diff options
Diffstat (limited to 'net-wireless/hostapd/files/2015-2/0001-WPS-Fix-HTTP-chunked-transfer-encoding-parser.patch')
| -rw-r--r-- | net-wireless/hostapd/files/2015-2/0001-WPS-Fix-HTTP-chunked-transfer-encoding-parser.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/net-wireless/hostapd/files/2015-2/0001-WPS-Fix-HTTP-chunked-transfer-encoding-parser.patch b/net-wireless/hostapd/files/2015-2/0001-WPS-Fix-HTTP-chunked-transfer-encoding-parser.patch new file mode 100644 index 000000000000..36b4ca294699 --- /dev/null +++ b/net-wireless/hostapd/files/2015-2/0001-WPS-Fix-HTTP-chunked-transfer-encoding-parser.patch @@ -0,0 +1,49 @@ +From 5acd23f4581da58683f3cf5e36cb71bbe4070bd7 Mon Sep 17 00:00:00 2001 +From: Jouni Malinen <j@w1.fi> +Date: Tue, 28 Apr 2015 17:08:33 +0300 +Subject: [PATCH] WPS: Fix HTTP chunked transfer encoding parser + +strtoul() return value may end up overflowing the int h->chunk_size and +resulting in a negative value to be stored as the chunk_size. This could +result in the following memcpy operation using a very large length +argument which would result in a buffer overflow and segmentation fault. + +This could have been used to cause a denial service by any device that +has been authorized for network access (either wireless or wired). This +would affect both the WPS UPnP functionality in a WPS AP (hostapd with +upnp_iface parameter set in the configuration) and WPS ER +(wpa_supplicant with WPS_ER_START control interface command used). + +Validate the parsed chunk length value to avoid this. In addition to +rejecting negative values, we can also reject chunk size that would be +larger than the maximum configured body length. + +Thanks to Kostya Kortchinsky of Google security team for discovering and +reporting this issue. + +Signed-off-by: Jouni Malinen <j@w1.fi> +--- + src/wps/httpread.c | 7 +++++++ + 1 file changed, 7 insertions(+) + +diff --git a/src/wps/httpread.c b/src/wps/httpread.c +index 2f08f37..d2855e3 100644 +--- a/src/wps/httpread.c ++++ b/src/wps/httpread.c +@@ -533,6 +533,13 @@ static void httpread_read_handler(int sd, void *eloop_ctx, void *sock_ctx) + if (!isxdigit(*cbp)) + goto bad; + h->chunk_size = strtoul(cbp, NULL, 16); ++ if (h->chunk_size < 0 || ++ h->chunk_size > h->max_bytes) { ++ wpa_printf(MSG_DEBUG, ++ "httpread: Invalid chunk size %d", ++ h->chunk_size); ++ goto bad; ++ } + /* throw away chunk header + * so we have only real data + */ +-- +1.9.1 + |