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libxml2: fix CVE-2014-0191

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It was discovered that libxml2, a library providing support to read,
modify and write XML files, incorrectly performs entity substituton in
the doctype prolog, even if the application using libxml2 disabled any
entity substitution. A remote attacker could provide a
specially-crafted XML file that, when processed, would lead to the
exhaustion of CPU and memory resources or file descriptors.

Reference: https://access.redhat.com/security/cve/CVE-2014-0191

(From OE-Core rev: 674bd59d5e357a4aba18c472ac21712a660a84af)

(From OE-Core rev: 51f674ab1f7dac049060c58f89e84c5d1275a87b)

Signed-off-by: Maxin B. John <maxin.john@enea.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Maxin B. John
2014-05-07 14:24:15 +02:00
committed by Richard Purdie
parent 2784c08229
commit 090cb60d49
2 changed files with 38 additions and 0 deletions
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1
meta/recipes-core/libxml/libxml2.inc
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@@ -18,6 +18,7 @@ SRC_URI = "ftp://xmlsoft.org/libxml2/libxml2-${PV}.tar.gz;name=libtar \
file://ansidecl.patch \
file://runtest.patch \
file://run-ptest \
file://libxml2-CVE-2014-0191-fix.patch \
"
inherit autotools pkgconfig binconfig pythonnative ptest

37
meta/recipes-core/libxml/libxml2/libxml2-CVE-2014-0191-fix.patch Normal file
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@@ -0,0 +1,37 @@
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.