Summary There is SEGV errors in LZWDecode in libtiff/tif_lzw.c:619 and libtiff/tif_lzw.c:624. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted tiff file. Version LIBTIFF, Version master (post 4.3.0), commit id b51bb157123264e26d34c09cc673d213aea61fc7 (Mon Mar 21 18:03:17 2022 +0100) 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/tiffcp -i poc1 /tmp/foo TIFFReadDirectoryCheckOrder: Warning, Invalid TIFF directory; tags are not sorted in ascending order. TIFFReadDirectory: Warning, Unknown field with tag 0 (0x0) encountered. TIFFReadDirectory: Warning, Unknown field with tag 32512 (0x7f00) encountered. TIFFReadDirectory: Warning, Unknown field with tag 45521 (0xb1d1) encountered. TIFFReadDirectory: Warning, Unknown field with tag 513 (0x201) encountered. TIFFReadDirectory: Warning, Unknown field with tag 771 (0x303) encountered. TIFFReadDirectory: Warning, Unknown field with tag 53456 (0xd0d0) encountered. TIFFFetchNormalTag: Warning, Incorrect count for "PhotometricInterpretation"; tag ignored. TIFFFetchNormalTag: Warning, IO error during reading of "DocumentName"; tag ignored. _TIFFVSetField: output_tiffcp_random_3/default/crashes/id:000000,sig:11,src:003319,time:155007069,execs:29344422,op:havoc,rep:16: Bad value 31 for "Orientation" tag. LZWDecode: Not enough data at scanline 0 (short 2018 bytes). output_tiffcp_random_3/default/crashes/id:000000,sig:11,src:003319,time:155007069,execs:29344422,op:havoc,rep:16: Using code not yet in table. ASAN:DEADLYSIGNAL ================================================================= ==1076584==ERROR: AddressSanitizer: SEGV on unknown address 0x00000000000b (pc 0x55ac4b6f03c6 bp 0x7ffd92557fb0 sp 0x7ffd92557ed0 T0) ==1076584==The signal is caused by a READ memory access. ==1076584==Hint: address points to the zero page. #0 0x55ac4b6f03c5 in LZWDecode /root/programs/libtiff/libtiff/tif_lzw.c:619 #1 0x55ac4b726b20 in TIFFReadScanline /root/programs/libtiff/libtiff/tif_read.c:447 #2 0x55ac4b64a607 in cpContig2ContigByRow /root/programs/libtiff/tools/tiffcp.c:1014 #3 0x55ac4b64a470 in tiffcp /root/programs/libtiff/tools/tiffcp.c:979 #4 0x55ac4b6472d5 in main /root/programs/libtiff/tools/tiffcp.c:334 #5 0x7ff15d37cc86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86) #6 0x55ac4b645db9 in _start (/root/programs/libtiff/build_asan/bin/tiffcp+0x26db9) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /root/programs/libtiff/libtiff/tif_lzw.c:619 in LZWDecode ==1076584==ABORTING ``` ``` ./build_asan/bin/tiffcp -i poc2 /tmp/foo TIFFReadDirectoryCheckOrder: Warning, Invalid TIFF directory; tags are not sorted in ascending order. TIFFReadDirectory: Warning, Unknown field with tag 0 (0x0) encountered. TIFFReadDirectory: Warning, Unknown field with tag 63242 (0xf70a) encountered. TIFFReadDirectory: Warning, Unknown field with tag 18688 (0x4900) encountered. TIFFReadDirectory: Warning, Unknown field with tag 45521 (0xb1d1) encountered. TIFFReadDirectory: Warning, Unknown field with tag 51721 (0xca09) encountered. TIFFReadDirectory: Warning, Unknown field with tag 513 (0x201) encountered. TIFFReadDirectory: Warning, Unknown field with tag 1023 (0x3ff) encountered. TIFFFetchNormalTag: Warning, Incorrect count for "PhotometricInterpretation"; tag ignored. TIFFFetchNormalTag: Warning, ASCII value for tag "Tag 63242" does not end in null byte. Forcing it to be null. TIFFFetchNormalTag: Warning, IO error during reading of "DocumentName"; tag ignored. _TIFFVSetField: output_tiffcp_random_3/default/crashes/id:000011,sig:11,src:005277,time:304660840,execs:63494869,op:havoc,rep:2: Bad value 31 for "Orientation" tag. LZWDecode: Not enough data at scanline 0 (short 121315 bytes). output_tiffcp_random_3/default/crashes/id:000011,sig:11,src:005277,time:304660840,execs:63494869,op:havoc,rep:2: Using code not yet in table. ASAN:DEADLYSIGNAL ================================================================= ==475857==ERROR: AddressSanitizer: SEGV on unknown address 0x00000000000b (pc 0x55a0bf7f7483 bp 0x7fff47a8f3e0 sp 0x7fff47a8f300 T0) ==475857==The signal is caused by a READ memory access. ==475857==Hint: address points to the zero page. #0 0x55a0bf7f7482 in LZWDecode /root/programs/libtiff/libtiff/tif_lzw.c:624 #1 0x55a0bf82db20 in TIFFReadScanline /root/programs/libtiff/libtiff/tif_read.c:447 #2 0x55a0bf751607 in cpContig2ContigByRow /root/programs/libtiff/tools/tiffcp.c:1014 #3 0x55a0bf751470 in tiffcp /root/programs/libtiff/tools/tiffcp.c:979 #4 0x55a0bf74e2d5 in main /root/programs/libtiff/tools/tiffcp.c:334 #5 0x7f5badb6cc86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86) #6 0x55a0bf74cdb9 in _start (/root/programs/libtiff/build_asan/bin/tiffcp+0x26db9) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /root/programs/libtiff/libtiff/tif_lzw.c:624 in LZWDecode ==475857==ABORTING ``` Platform ``` # uname -a Linux 4a409ce47130 5.4.0-70-generic #78~18.04.1-Ubuntu SMP Sat Mar 20 14:10:07 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux ``` [poc1](/uploads/e4ec6ecadc9c132ca14f7eb520571754/poc1) [poc2](/uploads/332afdff0add58884f558e9ba03590b9/poc2)