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libxml2: CVE-2016-9318 

libxml2 2.9.4 and earlier, as used in XMLSec 1.2.23 and earlier
and other products, does not offer a flag directly indicating that
the current document may be read but other files may not be opened,
which makes it easier for remote attackers to conduct XML External
Entity (XXE) attacks via a crafted document.

Reference:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9318

Upstream patch:
https://git.gnome.org/browse/libxml2/commit/?id=2304078555896cf1638c628f50326aeef6f0e0d0

(From OE-Core rev: 0dd44c00e3b2fbc3befc3f361624a3a60161d979)

Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Catalin Enache 2017-04-14 11:43:32 +03:00 committed by Richard Purdie
parent 5970acb3fe
commit d7ec005904
2 changed files with 208 additions and 0 deletions
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207
meta/recipes-core/libxml/libxml2/CVE-2016-9318.patch Normal file
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@ -0,0 +1,207 @@
From 7fa1cd31552d52d50a9101f07c816ff6dd2d9f19 Mon Sep 17 00:00:00 2001
From: Doran Moppert <dmoppert@redhat.com>
Date: Fri, 7 Apr 2017 16:45:56 +0200
Subject: [PATCH] Add an XML_PARSE_NOXXE flag to block all entities loading
even local
For https://bugzilla.gnome.org/show_bug.cgi?id=772726
* include/libxml/parser.h: Add a new parser flag XML_PARSE_NOXXE
* elfgcchack.h, xmlIO.h, xmlIO.c: associated loading routine
* include/libxml/xmlerror.h: new error raised
* xmllint.c: adds --noxxe flag to activate the option
Upstream-Status: Backport
CVE: CVE-2016-9318
Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
---
elfgcchack.h | 10 ++++++++++
include/libxml/parser.h | 3 ++-
include/libxml/xmlIO.h | 8 ++++++++
include/libxml/xmlerror.h | 1 +
parser.c | 4 ++++
xmlIO.c | 40 +++++++++++++++++++++++++++++++++++-----
xmllint.c | 5 +++++
7 files changed, 65 insertions(+), 6 deletions(-)
diff --git a/elfgcchack.h b/elfgcchack.h
index 8c52884..1b81dcd 100644
--- a/elfgcchack.h
+++ b/elfgcchack.h
@@ -6547,6 +6547,16 @@ extern __typeof (xmlNoNetExternalEntityLoader) xmlNoNetExternalEntityLoader__int
#endif
#endif
+#ifdef bottom_xmlIO
+#undef xmlNoXxeExternalEntityLoader
+extern __typeof (xmlNoXxeExternalEntityLoader) xmlNoXxeExternalEntityLoader __attribute((alias("xmlNoXxeExternalEntityLoader__internal_alias")));
+#else
+#ifndef xmlNoXxeExternalEntityLoader
+extern __typeof (xmlNoXxeExternalEntityLoader) xmlNoXxeExternalEntityLoader__internal_alias __attribute((visibility("hidden")));
+#define xmlNoXxeExternalEntityLoader xmlNoXxeExternalEntityLoader__internal_alias
+#endif
+#endif
+
#ifdef bottom_tree
#undef xmlNodeAddContent
extern __typeof (xmlNodeAddContent) xmlNodeAddContent __attribute((alias("xmlNodeAddContent__internal_alias")));
diff --git a/include/libxml/parser.h b/include/libxml/parser.h
index 47fbec0..63ca1b9 100644
--- a/include/libxml/parser.h
+++ b/include/libxml/parser.h
@@ -1111,7 +1111,8 @@ typedef enum {
XML_PARSE_HUGE = 1<<19,/* relax any hardcoded limit from the parser */
XML_PARSE_OLDSAX = 1<<20,/* parse using SAX2 interface before 2.7.0 */
XML_PARSE_IGNORE_ENC= 1<<21,/* ignore internal document encoding hint */
- XML_PARSE_BIG_LINES = 1<<22 /* Store big lines numbers in text PSVI field */
+ XML_PARSE_BIG_LINES = 1<<22,/* Store big lines numbers in text PSVI field */
+ XML_PARSE_NOXXE = 1<<23 /* Forbid any external entity loading */
} xmlParserOption;
XMLPUBFUN void XMLCALL
diff --git a/include/libxml/xmlIO.h b/include/libxml/xmlIO.h
index 3e41744..8d3fdef 100644
--- a/include/libxml/xmlIO.h
+++ b/include/libxml/xmlIO.h
@@ -300,6 +300,14 @@ XMLPUBFUN xmlParserInputPtr XMLCALL
xmlParserCtxtPtr ctxt);
/*
+ * A predefined entity loader external entity expansion
+ */
+XMLPUBFUN xmlParserInputPtr XMLCALL
+ xmlNoXxeExternalEntityLoader (const char *URL,
+ const char *ID,
+ xmlParserCtxtPtr ctxt);
+
+/*
* xmlNormalizeWindowsPath is obsolete, don't use it.
* Check xmlCanonicPath in uri.h for a better alternative.
*/
diff --git a/include/libxml/xmlerror.h b/include/libxml/xmlerror.h
index 037c16d..3036062 100644
--- a/include/libxml/xmlerror.h
+++ b/include/libxml/xmlerror.h
@@ -470,6 +470,7 @@ typedef enum {
XML_IO_EADDRINUSE, /* 1554 */
XML_IO_EALREADY, /* 1555 */
XML_IO_EAFNOSUPPORT, /* 1556 */
+ XML_IO_ILLEGAL_XXE, /* 1557 */
XML_XINCLUDE_RECURSION=1600,
XML_XINCLUDE_PARSE_VALUE, /* 1601 */
XML_XINCLUDE_ENTITY_DEF_MISMATCH, /* 1602 */
diff --git a/parser.c b/parser.c
index 53a6b7f..609a270 100644
--- a/parser.c
+++ b/parser.c
@@ -15350,6 +15350,10 @@ xmlCtxtUseOptionsInternal(xmlParserCtxtPtr ctxt, int options, const char *encodi
ctxt->options |= XML_PARSE_NONET;
options -= XML_PARSE_NONET;
}
+ if (options & XML_PARSE_NOXXE) {
+ ctxt->options |= XML_PARSE_NOXXE;
+ options -= XML_PARSE_NOXXE;
+ }
if (options & XML_PARSE_COMPACT) {
ctxt->options |= XML_PARSE_COMPACT;
options -= XML_PARSE_COMPACT;
diff --git a/xmlIO.c b/xmlIO.c
index 1a79c09..304f822 100644
--- a/xmlIO.c
+++ b/xmlIO.c
@@ -210,6 +210,7 @@ static const char *IOerr[] = {
"adddress in use", /* EADDRINUSE */
"already in use", /* EALREADY */
"unknown address familly", /* EAFNOSUPPORT */
+ "Attempt to load external entity %s", /* XML_IO_ILLEGAL_XXE */
};
#if defined(_WIN32) || defined (__DJGPP__) && !defined (__CYGWIN__)
@@ -4053,13 +4054,22 @@ xmlDefaultExternalEntityLoader(const char *URL, const char *ID,
xmlGenericError(xmlGenericErrorContext,
"xmlDefaultExternalEntityLoader(%s, xxx)\n", URL);
#endif
- if ((ctxt != NULL) && (ctxt->options & XML_PARSE_NONET)) {
+ if (ctxt != NULL) {
int options = ctxt->options;
- ctxt->options -= XML_PARSE_NONET;
- ret = xmlNoNetExternalEntityLoader(URL, ID, ctxt);
- ctxt->options = options;
- return(ret);
+ if (options & XML_PARSE_NOXXE) {
+ ctxt->options -= XML_PARSE_NOXXE;
+ ret = xmlNoXxeExternalEntityLoader(URL, ID, ctxt);
+ ctxt->options = options;
+ return(ret);
+ }
+
+ if (options & XML_PARSE_NONET) {
+ ctxt->options -= XML_PARSE_NONET;
+ ret = xmlNoNetExternalEntityLoader(URL, ID, ctxt);
+ ctxt->options = options;
+ return(ret);
+ }
}
#ifdef LIBXML_CATALOG_ENABLED
resource = xmlResolveResourceFromCatalog(URL, ID, ctxt);
@@ -4160,6 +4170,13 @@ xmlNoNetExternalEntityLoader(const char *URL, const char *ID,
xmlParserInputPtr input = NULL;
xmlChar *resource = NULL;
+ if (ctxt == NULL) {
+ return(NULL);
+ }
+ if (ctxt->input_id == 1) {
+ return xmlDefaultExternalEntityLoader((const char *) URL, ID, ctxt);
+ }
+
#ifdef LIBXML_CATALOG_ENABLED
resource = xmlResolveResourceFromCatalog(URL, ID, ctxt);
#endif
@@ -4182,5 +4199,18 @@ xmlNoNetExternalEntityLoader(const char *URL, const char *ID,
return(input);
}
+xmlParserInputPtr
+xmlNoXxeExternalEntityLoader(const char *URL, const char *ID,
+ xmlParserCtxtPtr ctxt) {
+ if (ctxt == NULL) {
+ return(NULL);
+ }
+ if (ctxt->input_id == 1) {
+ return xmlDefaultExternalEntityLoader((const char *) URL, ID, ctxt);
+ }
+ xmlIOErr(XML_IO_ILLEGAL_XXE, (const char *) URL);
+ return(NULL);
+}
+
#define bottom_xmlIO
#include "elfgcchack.h"
diff --git a/xmllint.c b/xmllint.c
index 67f7adb..d9368c1 100644
--- a/xmllint.c
+++ b/xmllint.c
@@ -3019,6 +3019,7 @@ static void usage(const char *name) {
printf("\t--path 'paths': provide a set of paths for resources\n");
printf("\t--load-trace : print trace of all external entities loaded\n");
printf("\t--nonet : refuse to fetch DTDs or entities over network\n");
+ printf("\t--noxxe : forbid any external entity loading\n");
printf("\t--nocompact : do not generate compact text nodes\n");
printf("\t--htmlout : output results as HTML\n");
printf("\t--nowrap : do not put HTML doc wrapper\n");
@@ -3461,6 +3462,10 @@ main(int argc, char **argv) {
(!strcmp(argv[i], "--nonet"))) {
options |= XML_PARSE_NONET;
xmlSetExternalEntityLoader(xmlNoNetExternalEntityLoader);
+ } else if ((!strcmp(argv[i], "-noxxe")) ||
+ (!strcmp(argv[i], "--noxxe"))) {
+ options |= XML_PARSE_NOXXE;
+ xmlSetExternalEntityLoader(xmlNoXxeExternalEntityLoader);
} else if ((!strcmp(argv[i], "-nocompact")) ||
(!strcmp(argv[i], "--nocompact"))) {
options &= ~XML_PARSE_COMPACT;
--
2.10.2

1
meta/recipes-core/libxml/libxml2_2.9.4.bb
View File

@ -23,6 +23,7 @@ SRC_URI = "ftp://xmlsoft.org/libxml2/libxml2-${PV}.tar.gz;name=libtar \
file://libxml2-CVE-2016-5131.patch \
file://libxml2-CVE-2016-4658.patch \
file://libxml2-fix_NULL_pointer_derefs.patch \
file://CVE-2016-9318.patch \
"
SRC_URI[libtar.md5sum] = "ae249165c173b1ff386ee8ad676815f5"