1 From b166cd84a77a6717be9600bf95378a0055d6f5a5 Mon Sep 17 00:00:00 2001
2 From: Jouni Malinen <jouni@qca.qualcomm.com>
3 Date: Tue, 5 Apr 2016 23:33:10 +0300
4 Subject: [PATCH 2/3] Reject SET_CRED commands with newline characters in the
7 Most of the cred block parameters are written as strings without
8 filtering and if there is an embedded newline character in the value,
9 unexpected configuration file data might be written.
11 This fixes an issue where wpa_supplicant could have updated the
12 configuration file cred parameter with arbitrary data from the control
13 interface or D-Bus interface. While those interfaces are supposed to be
14 accessible only for trusted users/applications, it may be possible that
15 an untrusted user has access to a management software component that
16 does not validate the credential value before passing it to
19 This could allow such an untrusted user to inject almost arbitrary data
20 into the configuration file. Such configuration file could result in
21 wpa_supplicant trying to load a library (e.g., opensc_engine_path,
22 pkcs11_engine_path, pkcs11_module_path, load_dynamic_eap) from user
23 controlled location when starting again. This would allow code from that
24 library to be executed under the wpa_supplicant process privileges.
26 Upstream-Status: Backport
30 Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
31 Signed-off-by: Zhixiong Chi <Zhixiong.Chi@windriver.com>
33 wpa_supplicant/config.c | 9 ++++++++-
34 1 file changed, 8 insertions(+), 1 deletion(-)
36 diff --git a/wpa_supplicant/config.c b/wpa_supplicant/config.c
37 index eb97cd5..69152ef 100644
38 --- a/wpa_supplicant/config.c
39 +++ b/wpa_supplicant/config.c
40 @@ -2896,6 +2896,8 @@ int wpa_config_set_cred(struct wpa_cred *cred, const char *var,
42 if (os_strcmp(var, "password") == 0 &&
43 os_strncmp(value, "ext:", 4) == 0) {
44 + if (has_newline(value))
46 str_clear_free(cred->password);
47 cred->password = os_strdup(value);
48 cred->ext_password = 1;
49 @@ -2946,9 +2948,14 @@ int wpa_config_set_cred(struct wpa_cred *cred, const char *var,
52 val = wpa_config_parse_string(value, &len);
55 + (os_strcmp(var, "excluded_ssid") != 0 &&
56 + os_strcmp(var, "roaming_consortium") != 0 &&
57 + os_strcmp(var, "required_roaming_consortium") != 0 &&
58 + has_newline(val))) {
59 wpa_printf(MSG_ERROR, "Line %d: invalid field '%s' string "
60 "value '%s'.", line, var, value);