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Reject psk parameter set with invalid passphrase character

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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>
This commit is contained in:
Jouni Malinen 2016-03-04 18:46:41 +02:00 committed by Jouni Malinen
parent f529c0d908
commit 73e4abb24a
1 changed files with 6 additions and 0 deletions
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6
wpa_supplicant/config.c
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@ -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 */