diff options
authorJouni Malinen <jouni@qca.qualcomm.com>2016-03-04 16:46:41 (GMT)
committerJouni Malinen <j@w1.fi>2016-05-02 08:08:25 (GMT)
commit73e4abb24a936014727924d8b0b2965edfc117dd (patch)
parentf529c0d9082b3ea4d165e4c74a9cb79f0498f204 (diff)
Reject psk parameter set with invalid passphrase character
WPA/WPA2-Personal passphrase is not allowed to include control characters. Reject a passphrase configuration attempt if that passphrase includes an invalid passphrase. This fixes an issue where wpa_supplicant could have updated the configuration file psk parameter with arbitrary data from the control interface or D-Bus interface. While those interfaces are supposed to be accessible only for trusted users/applications, it may be possible that an untrusted user has access to a management software component that does not validate the passphrase value before passing it to wpa_supplicant. This could allow such an untrusted user to inject up to 63 characters of almost arbitrary data into the configuration file. Such configuration file could result in wpa_supplicant trying to load a library (e.g., opensc_engine_path, pkcs11_engine_path, pkcs11_module_path, load_dynamic_eap) from user controlled location when starting again. This would allow code from that library to be executed under the wpa_supplicant process privileges. Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
1 files changed, 6 insertions, 0 deletions
diff --git a/wpa_supplicant/config.c b/wpa_supplicant/config.c
index b1c7870..fdd9643 100644
--- a/wpa_supplicant/config.c
+++ b/wpa_supplicant/config.c
@@ -478,6 +478,12 @@ static int wpa_config_parse_psk(const struct parse_data *data,
wpa_hexdump_ascii_key(MSG_MSGDUMP, "PSK (ASCII passphrase)",
(u8 *) value, len);
+ if (has_ctrl_char((u8 *) value, len)) {
+ wpa_printf(MSG_ERROR,
+ "Line %d: Invalid passphrase character",
+ line);
+ return -1;
+ }
if (ssid->passphrase && os_strlen(ssid->passphrase) == len &&
os_memcmp(ssid->passphrase, value, len) == 0) {
/* No change to the previously configured value */