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f2422aad3b
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:
50f06b3efb
(From OE-Core rev: d5406b389fcae8fb0f5fc9cc7dbf7ee819c04bc8)
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 92dc02b8f03f3586de0a2ec1463b189a3918e303)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
42 lines
1.2 KiB
Diff
42 lines
1.2 KiB
Diff
From 50f06b3efb638efb0abd95dc62dca05ae67882c2 Mon Sep 17 00:00:00 2001
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From: Nick Wellnhofer <wellnhofer@aevum.de>
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Date: Fri, 7 Aug 2020 21:54:27 +0200
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Subject: [PATCH] Fix out-of-bounds read with 'xmllint --htmlout'
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Make sure that truncated UTF-8 sequences don't cause an out-of-bounds
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array access.
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Thanks to @SuhwanSong and the Agency for Defense Development (ADD) for
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the report.
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Fixes #178.
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CVE: CVE-2020-24977
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Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/-/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2]
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Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
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---
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xmllint.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/xmllint.c b/xmllint.c
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index f6a8e463..c647486f 100644
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--- a/xmllint.c
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+++ b/xmllint.c
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@@ -528,6 +528,12 @@ static void
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xmlHTMLEncodeSend(void) {
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char *result;
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+ /*
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+ * xmlEncodeEntitiesReentrant assumes valid UTF-8, but the buffer might
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+ * end with a truncated UTF-8 sequence. This is a hack to at least avoid
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+ * an out-of-bounds read.
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+ */
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+ memset(&buffer[sizeof(buffer)-4], 0, 4);
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result = (char *) xmlEncodeEntitiesReentrant(NULL, BAD_CAST buffer);
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if (result) {
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xmlGenericError(xmlGenericErrorContext, "%s", result);
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--
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2.17.1
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