Heap buffer overflow in tiffcp.c:948
Summary
There is a heap buffer overflow 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 fb61aee8
POC file
heap-buffer-overflow_tiffcp.c-948
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 poc /tmp/foo
TIFFReadDirectoryCheckOrder: Warning, Invalid TIFF directory; tags are not sorted in ascending order.
poc2: Warning, Nonstandard tile width 1, convert file.
TIFFFetchStripThing: Warning, Incorrect count for "StripOffsets"; tag ignored.
TIFFFetchStripThing: Warning, Incorrect count for "StripByteCounts"; tag ignored.
=================================================================
==115545==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000ef9f at pc 0x7efffaa8b20b bp 0x7ffea9d01d20 sp 0x7ffea9d014c8
READ of size 1 at 0x60200000ef9f thread T0
#0 0x7efffaa8b20a in __interceptor_strlen (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x7020a)
#1 0x406f98 in tiffcp /root/programs/Libtiff/tools/tiffcp.c:948
#2 0x406f98 in main /root/programs/Libtiff/tools/tiffcp.c:334
#3 0x7efffa33e83f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
#4 0x401ab8 in _start (/root/programs/Libtiff/build_asan/bin/tiffcp+0x401ab8)
0x60200000ef9f is located 0 bytes to the right of 15-byte region [0x60200000ef90,0x60200000ef9f)
allocated by thread T0 here:
#0 0x7efffaab3602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
#1 0x7efffa7bbc61 in _TIFFmalloc /root/programs/Libtiff/libtiff/tif_unix.c:314
SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 __interceptor_strlen
Shadow bytes around the buggy address:
0x0c047fff9da0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9db0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9dc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9dd0: fa fa fa fa fa fa fa fa fa fa 02 fa fa fa fd fa
0x0c047fff9de0: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
=>0x0c047fff9df0: fa fa 00[07]fa fa fd fd fa fa 02 fa fa fa 00 00
0x0c047fff9e00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e40: 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
==115545==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