a0dbae07b3
Fixes CVE-2016-4476 and CVE-2016-4477: psk configuration parameter update allowing arbitrary data to be written. See http://w1.fi/security/2016-1/psk-parameter-config-update.txt for more details.
51 lines
2 KiB
Diff
51 lines
2 KiB
Diff
From 73e4abb24a936014727924d8b0b2965edfc117dd Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <jouni@qca.qualcomm.com>
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Date: Fri, 4 Mar 2016 18:46:41 +0200
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Subject: [PATCH 2/5] Reject psk parameter set with invalid passphrase
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character
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WPA/WPA2-Personal passphrase is not allowed to include control
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characters. Reject a passphrase configuration attempt if that passphrase
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includes an invalid passphrase.
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This fixes an issue where wpa_supplicant could have updated the
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configuration file psk parameter with arbitrary data from the control
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interface or D-Bus interface. While those interfaces are supposed to be
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accessible only for trusted users/applications, it may be possible that
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an untrusted user has access to a management software component that
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does not validate the passphrase value before passing it to
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wpa_supplicant.
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This could allow such an untrusted user to inject up to 63 characters of
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almost arbitrary data into the configuration file. Such configuration
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file could result in wpa_supplicant trying to load a library (e.g.,
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opensc_engine_path, pkcs11_engine_path, pkcs11_module_path,
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load_dynamic_eap) from user controlled location when starting again.
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This would allow code from that library to be executed under the
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wpa_supplicant process privileges.
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Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
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---
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wpa_supplicant/config.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git wpa_supplicant/config.c wpa_supplicant/config.c
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index b1c7870..fdd9643 100644
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--- wpa_supplicant/config.c
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+++ wpa_supplicant/config.c
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@@ -478,6 +478,12 @@ static int wpa_config_parse_psk(const struct parse_data *data,
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}
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wpa_hexdump_ascii_key(MSG_MSGDUMP, "PSK (ASCII passphrase)",
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(u8 *) value, len);
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+ if (has_ctrl_char((u8 *) value, len)) {
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+ wpa_printf(MSG_ERROR,
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+ "Line %d: Invalid passphrase character",
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+ line);
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+ return -1;
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+ }
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if (ssid->passphrase && os_strlen(ssid->passphrase) == len &&
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os_memcmp(ssid->passphrase, value, len) == 0) {
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/* No change to the previously configured value */
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--
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1.9.1
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