Summary There is heap-buffer-overflow errors in _TIFFmemcpy in libtiff/tif_unix.c:368. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted tiff file. Note that this is different from #495 Version LIBTIFF, Version master (post 4.4.0), commit id 1bdbd03fbb4e7d662af052450259fcd353a49cc0 (Tue Nov 29 17:02:09 2022 +0000) Steps to reproduce ``` # CFLAGS="-g -fsanitize=address -fno-omit-frame-pointer" CXXFLAGS="-g -fsanitize=address -fno-omit-frame-pointer" ./configure --prefix=$PWD/build_asan --disable-shared # make -j; make install; make clean $ ./build_asan/bin/tiffcrop -E right -z 1,1,2048,2048:1,2049,2048,4097 -i poc /tmp/foo TIFFReadDirectoryCheckOrder: Warning, Invalid TIFF directory; tags are not sorted in ascending order. TIFFSetField: poc_346_2: Invalid InkNames value; no NUL at given buffer end location 0, after 0 ink. TIFFReadDirectory: Warning, Ignoring ColorMap because BitsPerSample=128>24. ================================================================= ==145275==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x629000009a00 at pc 0x7f2391e0d58d bp 0x7ffe3c094ef0 sp 0x7ffe3c094698 WRITE of size 512 at 0x629000009a00 thread T0 #0 0x7f2391e0d58c in __interceptor_memcpy ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:790 #1 0x5606b0805184 in _TIFFmemcpy /root/programs_latest/libtiff/libtiff/tif_unix.c:368 #2 0x5606b076dd16 in extractContigSamplesBytes /root/programs_latest/libtiff/tools/tiffcrop.c:2903 #3 0x5606b0785162 in extractCompositeRegions /root/programs_latest/libtiff/tools/tiffcrop.c:6778 #4 0x5606b0788d0a in processCropSelections /root/programs_latest/libtiff/tools/tiffcrop.c:7733 #5 0x5606b076bbb1 in main /root/programs_latest/libtiff/tools/tiffcrop.c:2511 #6 0x7f23914d7082 in __libc_start_main ../csu/libc-start.c:308 #7 0x5606b076260d in _start (/root/programs_latest/libtiff/build_asan/bin/tiffcrop+0x2e60d) 0x629000009a00 is located 509 bytes to the right of 17923-byte region [0x629000005200,0x629000009803) allocated by thread T0 here: #0 0x7f2391e7f808 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:144 #1 0x5606b080509e in _TIFFmalloc /root/programs_latest/libtiff/libtiff/tif_unix.c:336 #2 0x5606b07627a0 in limitMalloc /root/programs_latest/libtiff/tools/tiffcrop.c:644 #3 0x5606b0788a81 in processCropSelections /root/programs_latest/libtiff/tools/tiffcrop.c:7705 #4 0x5606b076bbb1 in main /root/programs_latest/libtiff/tools/tiffcrop.c:2511 #5 0x7f23914d7082 in __libc_start_main ../csu/libc-start.c:308 SUMMARY: AddressSanitizer: heap-buffer-overflow ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:790 in __interceptor_memcpy Shadow bytes around the buggy address: 0x0c527fff92f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c527fff9300: 03 fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c527fff9310: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c527fff9320: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c527fff9330: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa =>0x0c527fff9340:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c527fff9350: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c527fff9360: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c527fff9370: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c527fff9380: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c527fff9390: 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 Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 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 Left alloca redzone: ca Right alloca redzone: cb Shadow gap: cc ==145275==ABORTING ``` Platform ``` # uname -a Linux dd189b3c7b86 5.15.0-52-generic #58~20.04.1-Ubuntu SMP Thu Oct 13 13:09:46 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux ``` [poc.zip](/uploads/b37c97c43f314daae2227b16dd00d369/poc.zip)