Product Link
https://github.com/caryll/otfcc
POC file
Command to reproduce
./otfccbuild --pretty [sample file] -o /dev/null
Product name & version
last github commit code : 617837b
Problem Type
heap-buffer-overflow
Crash Detail
==104121==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x617000007110 at pc 0x0000006c0bc4 bp 0x7ffc16d4ecb0 sp 0x7ffc16d4eca8
READ of size 4 at 0x617000007110 thread T0
#0 0x6c0bc3 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x6c0bc3)
#1 0x6baee8 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x6baee8)
#2 0x527687 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x527687)
#3 0x4fe3fe (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x4fe3fe)
#4 0x4f5710 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x4f5710)
#5 0x7f987337ac86 in __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:310
#6 0x41c549 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x41c549)
0x617000007110 is located 392 bytes to the right of 648-byte region [0x617000006d00,0x617000006f88)
freed by thread T0 here:
#0 0x4aeea8 in realloc (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x4aeea8)
#1 0x5add31 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x5add31)
#2 0x540f73 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x540f73)
#3 0x6bc059 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x6bc059)
#4 0x6baee8 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x6baee8)
#5 0x6baee8 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x6baee8)
#6 0x527687 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x527687)
#7 0x4fe3fe (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x4fe3fe)
#8 0x4f5710 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x4f5710)
#9 0x7f987337ac86 in __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:310
previously allocated by thread T0 here:
#0 0x4aeea8 in realloc (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x4aeea8)
#1 0x5add31 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x5add31)
#2 0x540696 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x540696)
#3 0x6bda43 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x6bda43)
#4 0x527687 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x527687)
#5 0x4fe3fe (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x4fe3fe)
#6 0x4f5710 (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x4f5710)
#7 0x7f987337ac86 in __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:310
SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x6c0bc3)
Shadow bytes around the buggy address:
0x0c2e7fff8dd0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c2e7fff8de0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c2e7fff8df0: fd fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2e7fff8e00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2e7fff8e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c2e7fff8e20: fa fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2e7fff8e30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2e7fff8e40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2e7fff8e50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2e7fff8e60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c2e7fff8e70: 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
==104121==ABORTING
Crash summary
SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/bupt/Desktop/otfcc/bin/release-x64/otfccdump+0x6c0bc3)