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authorOvidiu Panait <ovidiu.panait@windriver.com>2020-09-10 11:10:07 +0300
committerAnuj Mittal <anuj.mittal@intel.com>2020-11-23 14:11:22 +0800
commite3b5cd910b69516e59d02337de07a5206da3a877 (patch)
tree17195287d9c29e251664eb17ef8cca3ebca5b584
parente4b72150b19492c6edabb41e91bfd7c6a609b9e2 (diff)
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libxml2: Fix CVE-2020-24977
GNOME project libxml2 v2.9.10 and earlier have a global Buffer Overflow vulnerability in xmlEncodeEntitiesInternal at libxml2/entities.c. The issue has been fixed in commit 8e7c20a1 (20910-GITv2.9.10-103-g8e7c20a1). Reference: https://gitlab.gnome.org/GNOME/libxml2/-/issues/178 Upstream patch: https://gitlab.gnome.org/GNOME/libxml2/-/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2 Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com> Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
-rw-r--r--meta/recipes-core/libxml/libxml2/CVE-2020-24977.patch41
-rw-r--r--meta/recipes-core/libxml/libxml2_2.9.9.bb1
2 files changed, 42 insertions, 0 deletions
diff --git a/meta/recipes-core/libxml/libxml2/CVE-2020-24977.patch b/meta/recipes-core/libxml/libxml2/CVE-2020-24977.patch
new file mode 100644
index 0000000000..8224346660
--- /dev/null
+++ b/meta/recipes-core/libxml/libxml2/CVE-2020-24977.patch
@@ -0,0 +1,41 @@
+From 50f06b3efb638efb0abd95dc62dca05ae67882c2 Mon Sep 17 00:00:00 2001
+From: Nick Wellnhofer <wellnhofer@aevum.de>
+Date: Fri, 7 Aug 2020 21:54:27 +0200
+Subject: [PATCH] Fix out-of-bounds read with 'xmllint --htmlout'
+
+Make sure that truncated UTF-8 sequences don't cause an out-of-bounds
+array access.
+
+Thanks to @SuhwanSong and the Agency for Defense Development (ADD) for
+the report.
+
+Fixes #178.
+
+CVE: CVE-2020-24977
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/-/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2]
+
+Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
+---
+ xmllint.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/xmllint.c b/xmllint.c
+index f6a8e463..c647486f 100644
+--- a/xmllint.c
++++ b/xmllint.c
+@@ -528,6 +528,12 @@ static void
+ xmlHTMLEncodeSend(void) {
+ char *result;
+
++ /*
++ * xmlEncodeEntitiesReentrant assumes valid UTF-8, but the buffer might
++ * end with a truncated UTF-8 sequence. This is a hack to at least avoid
++ * an out-of-bounds read.
++ */
++ memset(&buffer[sizeof(buffer)-4], 0, 4);
+ result = (char *) xmlEncodeEntitiesReentrant(NULL, BAD_CAST buffer);
+ if (result) {
+ xmlGenericError(xmlGenericErrorContext, "%s", result);
+--
+2.17.1
+
diff --git a/meta/recipes-core/libxml/libxml2_2.9.9.bb b/meta/recipes-core/libxml/libxml2_2.9.9.bb
index 1d898ab020..ff496ccfaf 100644
--- a/meta/recipes-core/libxml/libxml2_2.9.9.bb
+++ b/meta/recipes-core/libxml/libxml2_2.9.9.bb
@@ -23,6 +23,7 @@ SRC_URI = "http://www.xmlsoft.org/sources/libxml2-${PV}.tar.gz;name=libtar \
file://Fix-CVE-2019-19956.patch \
file://CVE-2020-7595.patch \
file://CVE-2019-20388.patch \
+ file://CVE-2020-24977.patch \
"
SRC_URI[libtar.md5sum] = "c04a5a0a042eaa157e8e8c9eabe76bd6"