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A vulnerability was found in how hostapd and wpa_supplicant writes the configuration file update for the WPA/WPA2 passphrase parameter. If this parameter has been updated to include control characters either through a WPS operation (CVE-2016-4476) or through local configuration change over the wpa_supplicant control interface (CVE-2016-4477), the resulting configuration file may prevent the hostapd and wpa_supplicant from starting when the updated file is used. In addition for wpa_supplicant, it may be possible to load a local library file and execute code from there with the same privileges under which the wpa_supplicant process runs. These patches were developed upstream and published as a response to the security advisories CVE-2016-4476 and CVE-2016-4477. PR: 209564 Requested by: Sevan Janiyan
60 lines
2.3 KiB
Text
60 lines
2.3 KiB
Text
From b166cd84a77a6717be9600bf95378a0055d6f5a5 Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <jouni@qca.qualcomm.com>
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Date: Tue, 5 Apr 2016 23:33:10 +0300
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Subject: [PATCH 4/5] Reject SET_CRED commands with newline characters in the
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string values
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Most of the cred block parameters are written as strings without
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filtering and if there is an embedded newline character in the value,
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unexpected configuration file data might be written.
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This fixes an issue where wpa_supplicant could have updated the
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configuration file cred 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 credential value before passing it to
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wpa_supplicant.
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This could allow such an untrusted user to inject almost arbitrary data
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into the configuration file. Such configuration file could result in
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wpa_supplicant trying to load a library (e.g., opensc_engine_path,
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pkcs11_engine_path, pkcs11_module_path, load_dynamic_eap) from user
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controlled location when starting again. This would allow code from that
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library to be executed under the 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 | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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--- wpa_supplicant/config.c
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+++ wpa_supplicant/config.c
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@@ -2896,6 +2896,8 @@ int wpa_config_set_cred(struct wpa_cred *cred, const char *var,
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if (os_strcmp(var, "password") == 0 &&
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os_strncmp(value, "ext:", 4) == 0) {
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+ if (has_newline(value))
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+ return -1;
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str_clear_free(cred->password);
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cred->password = os_strdup(value);
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cred->ext_password = 1;
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@@ -2946,9 +2948,14 @@ int wpa_config_set_cred(struct wpa_cred *cred, const char *var,
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}
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val = wpa_config_parse_string(value, &len);
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- if (val == NULL) {
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+ if (val == NULL ||
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+ (os_strcmp(var, "excluded_ssid") != 0 &&
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+ os_strcmp(var, "roaming_consortium") != 0 &&
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+ os_strcmp(var, "required_roaming_consortium") != 0 &&
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+ has_newline(val))) {
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wpa_printf(MSG_ERROR, "Line %d: invalid field '%s' string "
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"value '%s'.", line, var, value);
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+ os_free(val);
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return -1;
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}
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--
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1.9.1
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