--- Begin Message ---
Package: release.debian.org
Severity: normal
Tags: buster
User: release.debian.org@packages.debian.org
Usertags: pu
Dear Stable Release Team,
At #983104, I have prepared a NMU RFS to fix two CVEs in mupdf for buster that are already fixed in
bullseye/sid. The security team asked me to hand in a Stable Proposed Updates request for it.
The debdiff for the NMU is attached.
Thanks,
Bastian
diff -Nru mupdf-1.14.0+ds1/debian/changelog mupdf-1.14.0+ds1/debian/changelog
--- mupdf-1.14.0+ds1/debian/changelog 2020-11-07 10:20:45.000000000 +0100
+++ mupdf-1.14.0+ds1/debian/changelog 2021-02-19 08:55:54.000000000 +0100
@@ -1,3 +1,13 @@
+mupdf (1.14.0+ds1-4+deb10u3) stable-proposed-updates; urgency=high
+
+ * Non-maintainer upload.
+ * Avoid a use-after-free in fz_drop_band_writer (CVE-2020-16600)
+ (Closes: #989526)
+ * Fix double free of object during linearization (CVE-2021-3407)
+ (Closes: #983684)
+
+ -- Bastian Germann <bastiangermann@fishpost.de> Fri, 19 Feb 2021 08:55:54 +0100
+
mupdf (1.14.0+ds1-4+deb10u2) buster-security; urgency=high
* Non-maintainer upload by the Security Team.
diff -Nru mupdf-1.14.0+ds1/debian/patches/0017-Bug-702253-Avoid-a-use-after-free-in-fz_drop_band_writer.patch mupdf-1.14.0+ds1/debian/patches/0017-Bug-702253-Avoid-a-use-after-free-in-fz_drop_band_writer.patch
--- mupdf-1.14.0+ds1/debian/patches/0017-Bug-702253-Avoid-a-use-after-free-in-fz_drop_band_writer.patch 1970-01-01 01:00:00.000000000 +0100
+++ mupdf-1.14.0+ds1/debian/patches/0017-Bug-702253-Avoid-a-use-after-free-in-fz_drop_band_writer.patch 2021-02-19 00:54:26.000000000 +0100
@@ -0,0 +1,34 @@
+From: theshoals <theshoals@users.noreply.github.com>
+Date: Mon, 4 May 2020 03:33:40 -0400
+Origin: http://git.ghostscript.com/?p=mupdf.git;h=96751b25462f83d6e16a9afaf8980b0c3f979c8b
+Bug: https://bugs.ghostscript.com/show_bug.cgi?id=702253
+Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2020-16600
+Subject: Bug 702253: Avoid a use-after-free in fz_drop_band_writer
+
+A use-after-free would occur when a valid page was followed by
+a page with invalid pixmap dimensions, causing bander --
+a static -- to point to previously freed memory instead of a new
+band_writer.
+---
+ source/tools/mudraw.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/source/tools/mudraw.c b/source/tools/mudraw.c
+index d17506d37..36536bd2c 100644
+--- a/source/tools/mudraw.c
++++ b/source/tools/mudraw.c
+@@ -920,7 +920,14 @@ static void dodrawpage(fz_context *ctx, fz_page *page, fz_display_list *list, in
+ fz_always(ctx)
+ {
+ if (output_format != OUT_PCLM)
++ {
+ fz_drop_band_writer(ctx, bander);
++ /* bander must be set to NULL to avoid use-after-frees. A use-after-free
++ * would occur when a valid page was followed by a page with invalid
++ * pixmap dimensions, causing bander -- a static -- to point to previously
++ * freed memory instead of a new band_writer. */
++ bander = NULL;
++ }
+ fz_drop_bitmap(ctx, bit);
+ bit = NULL;
+ if (num_workers > 0)
diff -Nru mupdf-1.14.0+ds1/debian/patches/0018-Bug-703366-Fix-double-free-of-object-during-lineariz.patch mupdf-1.14.0+ds1/debian/patches/0018-Bug-703366-Fix-double-free-of-object-during-lineariz.patch
--- mupdf-1.14.0+ds1/debian/patches/0018-Bug-703366-Fix-double-free-of-object-during-lineariz.patch 1970-01-01 01:00:00.000000000 +0100
+++ mupdf-1.14.0+ds1/debian/patches/0018-Bug-703366-Fix-double-free-of-object-during-lineariz.patch 2021-02-19 08:55:54.000000000 +0100
@@ -0,0 +1,51 @@
+From: Robin Watts <Robin.Watts@artifex.com>
+Date: Fri, 22 Jan 2021 17:05:15 +0000
+Subject: Bug 703366: Fix double free of object during linearization.
+origin: http://git.ghostscript.com/?p=mupdf.git;h=cee7cefc610d42fd383b3c80c12cbc675443176a
+Bug: https://bugs.ghostscript.com/show_bug.cgi?id=703366
+Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2021-3407
+Bug-Debian: https://bugs.debian.org/983684
+
+This appears to happen because we parse an illegal object from
+a broken file and assign it to object 0, which is defined to
+be free.
+
+Here, we fix the parsing code so this can't happen.
+---
+ source/pdf/pdf-parse.c | 6 ++++++
+ source/pdf/pdf-xref.c | 2 ++
+ 2 files changed, 8 insertions(+)
+
+diff --git a/source/pdf/pdf-parse.c b/source/pdf/pdf-parse.c
+index 7abc8c3d41aa..5761c3351773 100644
+--- a/source/pdf/pdf-parse.c
++++ b/source/pdf/pdf-parse.c
+@@ -749,6 +749,12 @@ pdf_parse_ind_obj(fz_context *ctx, pdf_document *doc,
+ fz_throw(ctx, FZ_ERROR_SYNTAX, "expected generation number (%d ? obj)", num);
+ }
+ gen = buf->i;
++ if (gen < 0 || gen >= 65536)
++ {
++ if (try_repair)
++ *try_repair = 1;
++ fz_throw(ctx, FZ_ERROR_SYNTAX, "invalid generation number (%d)", gen);
++ }
+
+ tok = pdf_lex(ctx, file, buf);
+ if (tok != PDF_TOK_OBJ)
+diff --git a/source/pdf/pdf-xref.c b/source/pdf/pdf-xref.c
+index 1b2bdcd59d70..30197b4b8577 100644
+--- a/source/pdf/pdf-xref.c
++++ b/source/pdf/pdf-xref.c
+@@ -1190,6 +1190,8 @@ pdf_read_new_xref(fz_context *ctx, pdf_document *doc, pdf_lexbuf *buf)
+ {
+ ofs = fz_tell(ctx, doc->file);
+ trailer = pdf_parse_ind_obj(ctx, doc, doc->file, buf, &num, &gen, &stm_ofs, NULL);
++ if (num == 0)
++ fz_throw(ctx, FZ_ERROR_GENERIC, "Trailer object number cannot be 0\n");
+ }
+ fz_catch(ctx)
+ {
+--
+2.30.0
+
diff -Nru mupdf-1.14.0+ds1/debian/patches/series mupdf-1.14.0+ds1/debian/patches/series
--- mupdf-1.14.0+ds1/debian/patches/series 2020-11-07 10:20:45.000000000 +0100
+++ mupdf-1.14.0+ds1/debian/patches/series 2021-02-19 08:55:54.000000000 +0100
@@ -14,3 +14,5 @@
0014-Bug-701118-Handle-appending-large-display-list-nodes.patch
0015-Bug-701118-Limit-size-of-begin-layer-nodes-in-displa.patch
0016-Bug-702857-Detect-avoid-overflow-when-calculating-si.patch
+0017-Bug-702253-Avoid-a-use-after-free-in-fz_drop_band_writer.patch
+0018-Bug-703366-Fix-double-free-of-object-during-lineariz.patch
--- End Message ---