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.pan...@windriver.com> --- .../libxml/libxml2/CVE-2020-24977.patch | 41 +++++++++++++++++++ meta/recipes-core/libxml/libxml2_2.9.10.bb | 1 + 2 files changed, 42 insertions(+) create mode 100644 meta/recipes-core/libxml/libxml2/CVE-2020-24977.patch 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 <wellnho...@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.pan...@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_2.9.10.bb b/meta/recipes-core/libxml/libxml2_2.9.10.bb index d11b083e8b..90890ffaed 100644 --- a/meta/recipes-core/libxml/libxml2_2.9.10.bb +++ b/meta/recipes-core/libxml/libxml2_2.9.10.bb @@ -22,6 +22,7 @@ SRC_URI = "http://www.xmlsoft.org/sources/libxml2-${PV}.tar.gz;name=libtar \ file://fix-execution-of-ptests.patch \ file://CVE-2020-7595.patch \ file://CVE-2019-20388.patch \ + file://CVE-2020-24977.patch \ " SRC_URI[libtar.md5sum] = "10942a1dc23137a8aa07f0639cbfece5" -- 2.17.1
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