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From: Daniel Veillard <veillard@redhat.com>
Date: Tue, 22 Apr 2014 15:30:56 +0800
Subject: Do not fetch external parameter entities
Unless explicitely asked for when validating or replacing entities
with their value. Problem pointed out by Daniel Berrange <berrange@redhat.com>
Upstream-Status: Backport
Reference: https://access.redhat.com/security/cve/CVE-2014-0191
Signed-off-by: Daniel Veillard <veillard@redhat.com>
Signed-off-by: Maxin B. John <maxin.john@enea.com>
---
diff -Naur libxml2-2.9.1-orig/parser.c libxml2-2.9.1/parser.c
--- libxml2-2.9.1-orig/parser.c 2013-04-16 15:39:18.000000000 +0200
+++ libxml2-2.9.1/parser.c 2014-05-07 13:35:46.883687946 +0200
@@ -2595,6 +2595,20 @@
xmlCharEncoding enc;
/*
+ * Note: external parsed entities will not be loaded, it is
+ * not required for a non-validating parser, unless the
+ * option of validating, or substituting entities were
+ * given. Doing so is far more secure as the parser will
+ * only process data coming from the document entity by
+ * default.
+ */
+ if ((entity->etype == XML_EXTERNAL_PARAMETER_ENTITY) &&
+ ((ctxt->options & XML_PARSE_NOENT) == 0) &&
+ ((ctxt->options & XML_PARSE_DTDVALID) == 0) &&
+ (ctxt->validate == 0))
+ return;
+
+ /*
* handle the extra spaces added before and after
* c.f. http://www.w3.org/TR/REC-xml#as-PE
* this is done independently.
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