92148c783d
Resolves: RHEL-4683 RHEL-4685 RHEL-4686 RHEL-4687 RHEL-4688 Co-authored-by: Matej Muzila <mmuzila@redhat.com>
129 lines
5.1 KiB
Diff
129 lines
5.1 KiB
Diff
From 73b3f582caa08a976d647537346790b182bbcc10 Mon Sep 17 00:00:00 2001
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From: Even Rouault <even.rouault@spatialys.com>
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Date: Sun, 5 Feb 2023 15:53:16 +0000
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Subject: [PATCH] (CVE-2023-0800 CVE-2023-0801 CVE-2023-0802 CVE-2023-0803
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CVE-2023-0804) tiffcrop: added check for assumption on composite images
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(fixes #496)
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Closes #501, #500, #498, #497 et #496
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See merge request libtiff/libtiff!466
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(cherry picked from commit 33aee1275d9d1384791d2206776eb8152d397f00)
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---
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tools/tiffcrop.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 66 insertions(+), 2 deletions(-)
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diff --git a/tools/tiffcrop.c b/tools/tiffcrop.c
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index 7f738d91..77923cf3 100644
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--- a/tools/tiffcrop.c
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+++ b/tools/tiffcrop.c
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@@ -5235,18 +5235,40 @@ computeInputPixelOffsets(struct crop_mask *crop, struct image_data *image,
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crop->regionlist[i].buffsize = buffsize;
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crop->bufftotal += buffsize;
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+
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+ /* For composite images with more than one region, the
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+ * combined_length or combined_width always needs to be equal,
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+ * respectively.
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+ * Otherwise, even the first section/region copy
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+ * action might cause buffer overrun. */
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if (crop->img_mode == COMPOSITE_IMAGES)
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{
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switch (crop->edge_ref)
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{
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case EDGE_LEFT:
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case EDGE_RIGHT:
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+ if (i > 0 && zlength != crop->combined_length)
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+ {
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+ TIFFError(
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+ "computeInputPixelOffsets",
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+ "Only equal length regions can be combined for "
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+ "-E left or right");
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+ return (-1);
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+ }
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crop->combined_length = zlength;
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crop->combined_width += zwidth;
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break;
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case EDGE_BOTTOM:
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case EDGE_TOP: /* width from left, length from top */
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default:
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+ if (i > 0 && zwidth != crop->combined_width)
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+ {
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+ TIFFError("computeInputPixelOffsets",
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+ "Only equal width regions can be "
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+ "combined for -E "
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+ "top or bottom");
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+ return (-1);
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+ }
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crop->combined_width = zwidth;
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crop->combined_length += zlength;
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break;
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@@ -6390,6 +6412,46 @@ extractCompositeRegions(struct image_data *image, struct crop_mask *crop,
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crop->combined_width = 0;
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crop->combined_length = 0;
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+ /* If there is more than one region, check beforehand whether all the width
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+ * and length values of the regions are the same, respectively. */
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+ switch (crop->edge_ref)
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+ {
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+ default:
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+ case EDGE_TOP:
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+ case EDGE_BOTTOM:
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+ for (i = 1; i < crop->selections; i++)
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+ {
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+ uint32_t crop_width0 =
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+ crop->regionlist[i - 1].x2 - crop->regionlist[i - 1].x1 + 1;
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+ uint32_t crop_width1 =
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+ crop->regionlist[i].x2 - crop->regionlist[i].x1 + 1;
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+ if (crop_width0 != crop_width1)
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+ {
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+ TIFFError("extractCompositeRegions",
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+ "Only equal width regions can be combined for -E "
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+ "top or bottom");
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+ return (1);
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+ }
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+ }
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+ break;
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+ case EDGE_LEFT:
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+ case EDGE_RIGHT:
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+ for (i = 1; i < crop->selections; i++)
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+ {
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+ uint32_t crop_length0 =
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+ crop->regionlist[i - 1].y2 - crop->regionlist[i - 1].y1 + 1;
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+ uint32_t crop_length1 =
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+ crop->regionlist[i].y2 - crop->regionlist[i].y1 + 1;
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+ if (crop_length0 != crop_length1)
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+ {
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+ TIFFError("extractCompositeRegions",
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+ "Only equal length regions can be combined for "
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+ "-E left or right");
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+ return (1);
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+ }
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+ }
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+ }
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+
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for (i = 0; i < crop->selections; i++)
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{
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/* rows, columns, width, length are expressed in pixels */
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@@ -6414,7 +6476,8 @@ extractCompositeRegions(struct image_data *image, struct crop_mask *crop,
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default:
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case EDGE_TOP:
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case EDGE_BOTTOM:
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- if ((i > 0) && (crop_width != crop->regionlist[i - 1].width))
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+ if ((crop->selections > i + 1) &&
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+ (crop_width != crop->regionlist[i + 1].width))
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{
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TIFFError ("extractCompositeRegions",
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"Only equal width regions can be combined for -E top or bottom");
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@@ -6495,7 +6558,8 @@ extractCompositeRegions(struct image_data *image, struct crop_mask *crop,
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break;
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case EDGE_LEFT: /* splice the pieces of each row together, side by side */
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case EDGE_RIGHT:
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- if ((i > 0) && (crop_length != crop->regionlist[i - 1].length))
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+ if ((crop->selections > i + 1) &&
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+ (crop_length != crop->regionlist[i + 1].length))
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{
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TIFFError ("extractCompositeRegions",
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"Only equal length regions can be combined for -E left or right");
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