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CVE-2016-4802.patch
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CVE-2016-4802.patch
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From 6b275d58327950e8e92b963067e75c9211ecfc69 Mon Sep 17 00:00:00 2001
From: Steve Holme <steve_holme@hotmail.com>
Date: Sun, 29 May 2016 22:57:40 +0200
Subject: [PATCH] loadlibrary: Only load system DLLs from the system directory
Inspiration provided by: Daniel Stenberg and Ray Satiro
Bug: https://curl.haxx.se/docs/adv_20160530.html
Ref: Windows DLL hijacking with curl, CVE-2016-4802
---
lib/Makefile.inc | 4 +-
lib/Makefile.vc6 | 3 +-
lib/curl_sspi.c | 7 +-
lib/system_win32.c | 130 +++++++++++++++++++++++++++++++++++++
lib/system_win32.h | 39 +++++++++++
lib/telnet.c | 3 +-
packages/Symbian/group/libcurl.mmp | 2 +-
7 files changed, 180 insertions(+), 8 deletions(-)
create mode 100644 lib/system_win32.c
create mode 100644 lib/system_win32.h
diff --git a/lib/Makefile.inc b/lib/Makefile.inc
index b573e93..0ed998c 100644
--- a/lib/Makefile.inc
+++ b/lib/Makefile.inc
@@ -51,11 +51,11 @@ LIB_CFILES = file.c timeval.c base64.c hostip.c progress.c formdata.c \
pingpong.c rtsp.c curl_threads.c warnless.c hmac.c curl_rtmp.c \
openldap.c curl_gethostname.c gopher.c idn_win32.c \
http_proxy.c non-ascii.c asyn-ares.c asyn-thread.c curl_gssapi.c \
http_ntlm.c curl_ntlm_wb.c curl_ntlm_core.c curl_sasl.c \
curl_multibyte.c hostcheck.c conncache.c pipeline.c dotdot.c \
- x509asn1.c http2.c smb.c curl_endian.c curl_des.c
+ x509asn1.c http2.c smb.c curl_endian.c curl_des.c system_win32.c
LIB_HFILES = arpa_telnet.h netrc.h file.h timeval.h hostip.h progress.h \
formdata.h cookie.h http.h sendf.h ftp.h url.h dict.h if2ip.h \
speedcheck.h urldata.h curl_ldap.h escape.h telnet.h getinfo.h \
strequal.h curl_sec.h memdebug.h http_chunks.h curl_fnmatch.h \
@@ -70,11 +70,11 @@ LIB_HFILES = arpa_telnet.h netrc.h file.h timeval.h hostip.h progress.h \
curl_gethostname.h gopher.h http_proxy.h non-ascii.h asyn.h \
http_ntlm.h curl_gssapi.h curl_ntlm_wb.h curl_ntlm_core.h \
curl_sasl.h curl_multibyte.h hostcheck.h conncache.h \
curl_setup_once.h multihandle.h setup-vms.h pipeline.h dotdot.h \
x509asn1.h http2.h sigpipe.h smb.h curl_endian.h curl_des.h \
- curl_printf.h
+ curl_printf.h system_win32.h
LIB_RCFILES = libcurl.rc
CSOURCES = $(LIB_CFILES) $(LIB_VAUTH_CFILES) $(LIB_VTLS_CFILES)
HHEADERS = $(LIB_HFILES) $(LIB_VAUTH_HFILES) $(LIB_VTLS_HFILES)
diff --git a/lib/Makefile.vc6 b/lib/Makefile.vc6
index d6c815e..b4cb229 100644
--- a/lib/Makefile.vc6
+++ b/lib/Makefile.vc6
@@ -3,11 +3,11 @@
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
-# Copyright (C) 1999 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1999 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.haxx.se/docs/copyright.html.
#
@@ -614,10 +614,11 @@ X_OBJS= \
$(DIROBJ)\socks_gssapi.obj \
$(DIROBJ)\socks_sspi.obj \
$(DIROBJ)\speedcheck.obj \
$(DIROBJ)\splay.obj \
$(DIROBJ)\ssh.obj \
+ $(DIROBJ)\system_win32.obj \
$(DIROBJ)\vauth.obj \
$(DIROBJ)\cleartext.obj \
$(DIROBJ)\cram.obj \
$(DIROBJ)\digest.obj \
$(DIROBJ)\digest_sspi.obj \
diff --git a/lib/curl_sspi.c b/lib/curl_sspi.c
index 04eac48..54bbef6 100644
--- a/lib/curl_sspi.c
+++ b/lib/curl_sspi.c
@@ -3,11 +3,11 @@
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
- * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
@@ -25,10 +25,11 @@
#ifdef USE_WINDOWS_SSPI
#include <curl/curl.h>
#include "curl_sspi.h"
#include "curl_multibyte.h"
+#include "system_win32.h"
#include "warnless.h"
/* The last #include files should be: */
#include "curl_memory.h"
#include "memdebug.h"
@@ -115,13 +116,13 @@ CURLcode Curl_sspi_global_init(void)
securityDll = TRUE;
#endif
/* Load SSPI dll into the address space of the calling process */
if(securityDll)
- s_hSecDll = LoadLibrary(TEXT("security.dll"));
+ s_hSecDll = Curl_load_library(TEXT("security.dll"));
else
- s_hSecDll = LoadLibrary(TEXT("secur32.dll"));
+ s_hSecDll = Curl_load_library(TEXT("secur32.dll"));
if(!s_hSecDll)
return CURLE_FAILED_INIT;
/* Get address of the InitSecurityInterfaceA function from the SSPI dll */
pInitSecurityInterface = (INITSECURITYINTERFACE_FN)
diff --git a/lib/system_win32.c b/lib/system_win32.c
new file mode 100644
index 0000000..73d30b4
--- /dev/null
+++ b/lib/system_win32.c
@@ -0,0 +1,130 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2016, Steve Holme, <steve_holme@hotmail.com>.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#if defined(WIN32)
+
+#if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
+ defined(USE_WINSOCK))
+
+#include <curl/curl.h>
+#include "system_win32.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+#if !defined(LOAD_WITH_ALTERED_SEARCH_PATH)
+#define LOAD_WITH_ALTERED_SEARCH_PATH 0x00000008
+#endif
+
+#if !defined(LOAD_LIBRARY_SEARCH_SYSTEM32)
+#define LOAD_LIBRARY_SEARCH_SYSTEM32 0x00000800
+#endif
+
+/* We use our own typedef here since some headers might lack these */
+typedef HMODULE (APIENTRY *LOADLIBRARYEX_FN)(LPCTSTR, HANDLE, DWORD);
+
+/* See function definitions in winbase.h */
+#ifdef UNICODE
+# ifdef _WIN32_WCE
+# define LOADLIBARYEX L"LoadLibraryExW"
+# else
+# define LOADLIBARYEX "LoadLibraryExW"
+# endif
+#else
+# define LOADLIBARYEX "LoadLibraryExA"
+#endif
+
+/*
+ * Curl_load_library()
+ *
+ * This is used to dynamically load DLLs using the most secure method available
+ * for the version of Windows that we are running on.
+ *
+ * Parameters:
+ *
+ * filename [in] - The filename or full path of the DLL to load. If only the
+ * filename is passed then the DLL will be loaded from the
+ * Windows system directory.
+ *
+ * Returns the handle of the module on success; otherwise NULL.
+ */
+HMODULE Curl_load_library(LPCTSTR filename)
+{
+ HMODULE hModule = NULL;
+ LOADLIBRARYEX_FN pLoadLibraryEx = NULL;
+
+ /* Get a handle to kernel32 so we can access it's functions at runtime */
+ HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32"));
+ if(!hKernel32)
+ return NULL;
+
+ /* Attempt to find LoadLibraryEx() which is only available on Windows 2000
+ and above */
+ pLoadLibraryEx = (LOADLIBRARYEX_FN) GetProcAddress(hKernel32, LOADLIBARYEX);
+
+ /* Detect if there's already a path in the filename and load the library if
+ there is. Note: Both back slashes and forward slashes have been supported
+ since the earlier days of DOS at an API level although they are not
+ supported by command prompt */
+ if(_tcspbrk(filename, TEXT("\\/")))
+ hModule = pLoadLibraryEx ?
+ pLoadLibraryEx(filename, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
+ LoadLibrary(filename);
+ /* Detect if KB2533623 is installed, as LOAD_LIBARY_SEARCH_SYSTEM32 is only
+ supported on Windows Vista, Windows Server 2008, Windows 7 and Windows
+ Server 2008 R2 with this patch or natively on Windows 8 and above */
+ else if(pLoadLibraryEx && GetProcAddress(hKernel32, "AddDllDirectory")) {
+ /* Load the DLL from the Windows system directory */
+ hModule = pLoadLibraryEx(filename, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
+ }
+ else {
+ /* Attempt to get the Windows system path */
+ UINT systemdirlen = GetSystemDirectory(NULL, 0);
+ if(systemdirlen) {
+ /* Allocate space for the full DLL path (Room for the null terminator
+ is included in systemdirlen) */
+ size_t filenamelen = _tcslen(filename);
+ TCHAR *path = malloc(sizeof(TCHAR) * (systemdirlen + 1 + filenamelen));
+ if(path && GetSystemDirectory(path, systemdirlen)) {
+ /* Calculate the full DLL path */
+ _tcscpy(path + _tcslen(path), TEXT("\\"));
+ _tcscpy(path + _tcslen(path), filename);
+
+ /* Load the DLL from the Windows system directory */
+ hModule = pLoadLibraryEx ?
+ pLoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
+ LoadLibrary(path);
+
+ free(path);
+ }
+ }
+ }
+
+ return hModule;
+}
+
+#endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
+
+#endif /* WIN32 */
diff --git a/lib/system_win32.h b/lib/system_win32.h
new file mode 100644
index 0000000..dec1889
--- /dev/null
+++ b/lib/system_win32.h
@@ -0,0 +1,39 @@
+#ifndef HEADER_CURL_SYSTEM_WIN32_H
+#define HEADER_CURL_SYSTEM_WIN32_H
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2016, Steve Holme, <steve_holme@hotmail.com>.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#if defined(WIN32)
+
+#if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
+ defined(USE_WINSOCK))
+
+/* This is used to dynamically load DLLs */
+HMODULE Curl_load_library(LPCTSTR filename);
+
+#endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
+
+#endif /* WIN32 */
+
+#endif /* HEADER_CURL_SYSTEM_WIN32_H */
diff --git a/lib/telnet.c b/lib/telnet.c
index 6b73bc5..870a1b8 100644
--- a/lib/telnet.c
+++ b/lib/telnet.c
@@ -49,10 +49,11 @@
#include "transfer.h"
#include "sendf.h"
#include "telnet.h"
#include "connect.h"
#include "progress.h"
+#include "system_win32.h"
#define TELOPTS
#define TELCMDS
#include "arpa_telnet.h"
@@ -1332,11 +1333,11 @@ static CURLcode telnet_do(struct connectdata *conn, bool *done)
if(result)
return result;
/* OK, so we have WinSock 2.0. We need to dynamically */
/* load ws2_32.dll and get the function pointers we need. */
- wsock2 = LoadLibrary(TEXT("WS2_32.DLL"));
+ wsock2 = Curl_load_library(TEXT("WS2_32.DLL"));
if(wsock2 == NULL) {
failf(data, "failed to load WS2_32.DLL (%d)", ERRNO);
return CURLE_FAILED_INIT;
}
diff --git a/packages/Symbian/group/libcurl.mmp b/packages/Symbian/group/libcurl.mmp
index be22fda..f74b19b 100644
--- a/packages/Symbian/group/libcurl.mmp
+++ b/packages/Symbian/group/libcurl.mmp
@@ -37,11 +37,11 @@ SOURCE \
vtls/polarssl.c curl_rtmp.c openldap.c curl_gethostname.c gopher.c \
vtls/axtls.c idn_win32.c vtls/cyassl.c http_proxy.c non-ascii.c \
asyn-ares.c asyn-thread.c curl_gssapi.c http_ntlm.c curl_ntlm_wb.c \
curl_ntlm_core.c curl_sasl.c vtls/schannel.c curl_multibyte.c \
vtls/darwinssl.c conncache.c curl_sasl_sspi.c smb.c curl_endian.c \
- curl_des.c \
+ curl_des.c system_win32.c \
vauth/vauth.c vauth/cleartext.c vauth/cram.c vauth/digest.c \
vauth/digest_sspi.c vauth/krb5_gssapi.c vauth/krb5_sspi.c \
vauth/ntlm.c vauth/ntlm_sspi.c vauth/oauth2.c vauth/spnego_gssapi.c \
vauth/spnego_sspi.c
--
2.8.1