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Fix bug #76557: heap-buffer-overflow (READ of size 48) while reading exif data

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Use MAKERNOTE length as data size.
This commit is contained in:
Stanislav Malyshev 2018-07-01 22:20:19 -07:00
parent 1baeae4270
commit 3462efa386
3 changed files with 83 additions and 1 deletions
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5
ext/exif/exif.c
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@ -2728,6 +2728,7 @@ static int exif_process_IFD_in_MAKERNOTE(image_info_type *ImageInfo, char * valu
int NumDirEntries, old_motorola_intel, offset_diff; int NumDirEntries, old_motorola_intel, offset_diff;
const maker_note_type *maker_note; const maker_note_type *maker_note;
char *dir_start; char *dir_start;
int data_len;
for (i=0; i<=sizeof(maker_note_array)/sizeof(maker_note_type); i++) { for (i=0; i<=sizeof(maker_note_array)/sizeof(maker_note_type); i++) {
if (i==sizeof(maker_note_array)/sizeof(maker_note_type)) { if (i==sizeof(maker_note_array)/sizeof(maker_note_type)) {
@ -2782,6 +2783,7 @@ static int exif_process_IFD_in_MAKERNOTE(image_info_type *ImageInfo, char * valu
switch (maker_note->offset_mode) { switch (maker_note->offset_mode) {
case MN_OFFSET_MAKER: case MN_OFFSET_MAKER:
offset_base = value_ptr; offset_base = value_ptr;
data_len = value_len;
break; break;
case MN_OFFSET_GUESS: case MN_OFFSET_GUESS:
if (maker_note->offset + 10 + 4 >= value_len) { if (maker_note->offset + 10 + 4 >= value_len) {
@ -2798,6 +2800,7 @@ static int exif_process_IFD_in_MAKERNOTE(image_info_type *ImageInfo, char * valu
return FALSE; return FALSE;
} }
offset_base = value_ptr + offset_diff; offset_base = value_ptr + offset_diff;
data_len = value_len - offset_diff;
break; break;
default: default:
case MN_OFFSET_NORMAL: case MN_OFFSET_NORMAL:
@ -2811,7 +2814,7 @@ static int exif_process_IFD_in_MAKERNOTE(image_info_type *ImageInfo, char * valu
for (de=0;de<NumDirEntries;de++) { for (de=0;de<NumDirEntries;de++) {
if (!exif_process_IFD_TAG(ImageInfo, dir_start + 2 + 12 * de, if (!exif_process_IFD_TAG(ImageInfo, dir_start + 2 + 12 * de,
offset_base, IFDlength, displacement, section_index, 0, maker_note->tag_table TSRMLS_CC)) { offset_base, data_len, displacement, section_index, 0, maker_note->tag_table TSRMLS_CC)) {
return FALSE; return FALSE;
} }
} }

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ext/exif/tests/bug76557.jpg Normal file
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79
ext/exif/tests/bug76557.phpt Normal file
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@ -0,0 +1,79 @@
--TEST--
Bug 76557 (heap-buffer-overflow (READ of size 48) while reading exif data)
--SKIPIF--
<?php if (!extension_loaded('exif')) print 'skip exif extension not available';?>
--FILE--
<?php
var_dump(count(exif_read_data(dirname(__FILE__) . "/bug76557.jpg")));
?>
DONE
--EXPECTF--
Warning: exif_read_data(bug76557.jpg): Process tag(x010F=Make ): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x8769=Exif_IFD_Po): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x927C=MakerNote ): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal format code 0x3030, suppose BYTE in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Process tag(x3030=UndefinedTa): Illegal pointer offset(x30303030 + x30303030 = x60606060 > x00EE) in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): File structure corrupted in %sbug76557.php on line %d
Warning: exif_read_data(bug76557.jpg): Invalid JPEG file in %sbug76557.php on line %d
int(1)
DONE