Summary There is a heap buffer overflow in cpContigBufToSeparateBuf in tools/tiffcp.c. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted tiff file. Version LIBTIFF, Version 4.3.0, commit id fb61aee88af047a727dd9aefeb7096c075b61581 POC file [heap-buffer-overflow_tiffcp.c-1373](/uploads/2cf74e773cfa548d7a1458570b2f3a8c/heap-buffer-overflow_tiffcp.c-1373) Steps to reproduce ``` # export CFLAGS="-O -g -fsanitize=address" # export CXXFLAGS="-O -g -fsanitize=address" # ./configure --prefix=$PWD/build_asan # make -j64 & make install # ./build_asan/bin/tiffcp -i -s -p separate poc /tmp/foo TIFFReadDirectoryCheckOrder: Warning, Invalid TIFF directory; tags are not sorted in ascending order. poc: Warning, Nonstandard tile width 1, convert file. TIFFFetchStripThing: Warning, Incorrect count for "StripOffsets"; tag ignored. TIFFFetchStripThing: Warning, Incorrect count for "StripByteCounts"; tag ignored. TIFFFillTile: 0: Invalid tile byte count, tile 1. TIFFFillTile: 0: Invalid tile byte count, tile 2. TIFFFillTile: 0: Invalid tile byte count, tile 3. TIFFFillTile: 0: Invalid tile byte count, tile 4. TIFFFillTile: 0: Invalid tile byte count, tile 5. TIFFFillTile: 0: Invalid tile byte count, tile 6. TIFFFillTile: 0: Invalid tile byte count, tile 7. TIFFFillTile: 0: Invalid tile byte count, tile 8. TIFFFillTile: 0: Invalid tile byte count, tile 9. TIFFFillTile: 0: Invalid tile byte count, tile 10. TIFFFillTile: 0: Invalid tile byte count, tile 11. TIFFFillTile: 0: Invalid tile byte count, tile 12. TIFFFillTile: 0: Invalid tile byte count, tile 13. TIFFFillTile: 0: Invalid tile byte count, tile 14. TIFFFillTile: 0: Invalid tile byte count, tile 15. ================================================================= ==44064==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61500000ff00 at pc 0x000000401e4b bp 0x7ffcfd19e4f0 sp 0x7ffcfd19e4e0 READ of size 1 at 0x61500000ff00 thread T0 #0 0x401e4a in cpContigBufToSeparateBuf /root/programs/Libtiff/tools/tiffcp.c:1373 #1 0x4034a2 in writeBufferToSeparateStrips /root/programs/Libtiff/tools/tiffcp.c:1683 #2 0x404001 in cpImage /root/programs/Libtiff/tools/tiffcp.c:1420 #3 0x4040c7 in cpContigTiles2SeparateStrips /root/programs/Libtiff/tools/tiffcp.c:1934 #4 0x407600 in tiffcp /root/programs/Libtiff/tools/tiffcp.c:979 #5 0x407600 in main /root/programs/Libtiff/tools/tiffcp.c:334 #6 0x7fd77abcc83f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f) #7 0x401ab8 in _start (/root/programs/Libtiff/build_asan/bin/tiffcp+0x401ab8) 0x61500000ff00 is located 0 bytes to the right of 512-byte region [0x61500000fd00,0x61500000ff00) allocated by thread T0 here: #0 0x7fd77b341602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602) #1 0x7fd77b049c61 in _TIFFmalloc /root/programs/Libtiff/libtiff/tif_unix.c:314 SUMMARY: AddressSanitizer: heap-buffer-overflow /root/programs/Libtiff/tools/tiffcp.c:1373 cpContigBufToSeparateBuf Shadow bytes around the buggy address: 0x0c2a7fff9f90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c2a7fff9fa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c2a7fff9fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c2a7fff9fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c2a7fff9fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0c2a7fff9fe0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c2a7fff9ff0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c2a7fffa000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c2a7fffa010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c2a7fffa020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c2a7fffa030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe ==44064==ABORTING ``` Platform ``` # uname -a Linux 37d1a8efe7bb 4.15.0-142-generic #146~16.04.1-Ubuntu SMP Tue Apr 13 09:27:15 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux ```(Operating system, architecture, compiler details)`