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authorMaxin B. John <maxin.john@enea.com>2014-05-07 14:24:15 +0200
committerRichard Purdie <richard.purdie@linuxfoundation.org>2014-05-08 13:00:23 +0100
commit674bd59d5e357a4aba18c472ac21712a660a84af (patch)
tree7ce74ef39d460f5ede9dac92250359d1ebd8bf00 /meta/recipes-core/libxml/libxml2
parentfe19e4d13a645efccd778cfd3a7b55fe74498d60 (diff)
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libxml2: fix CVE-2014-0191
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 Signed-off-by: Maxin B. John <maxin.john@enea.com> Signed-off-by: Saul Wold <sgw@linux.intel.com>
Diffstat (limited to 'meta/recipes-core/libxml/libxml2')
-rw-r--r--meta/recipes-core/libxml/libxml2/libxml2-CVE-2014-0191-fix.patch37
1 files changed, 37 insertions, 0 deletions
diff --git a/meta/recipes-core/libxml/libxml2/libxml2-CVE-2014-0191-fix.patch b/meta/recipes-core/libxml/libxml2/libxml2-CVE-2014-0191-fix.patch
new file mode 100644
index 0000000000..1c05ae649e
--- /dev/null
+++ b/meta/recipes-core/libxml/libxml2/libxml2-CVE-2014-0191-fix.patch
@@ -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.