Bug: heap-buffer-overflow in dump_entry.c

[puppet]

Version:  ncurses 6.2.20200212
OS: Ubuntu 16.04 LTS
POC: https://github.com/puppet-meteor/NLP_POC/blob/master/infotocap/POC_11_000092
cmd: ./infotocap POC
ASAN log:

=================================================================
==19468==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffffffebee4 at pc 0x00000041b9a0 bp 0x7ffffffead70 sp 0x7ffffffead60
WRITE of size 1 at 0x7ffffffebee4 thread T0
    #0 0x41b99f in fmt_entry ../../progs/dump_entry.c:1144
    #1 0x41da5c in dump_entry ../../progs/dump_entry.c:1542
    #2 0x405e5e in main ../../progs/tic.c:1041
    #3 0x7ffff6ac082f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #4 0x4024e8 in _start (/data3/ASAN/ncurses-6.2/ASAN/infotocap+0x4024e8)

Address 0x7ffffffebee4 is located in stack of thread T0 at offset 4212 in frame
    #0 0x419ab6 in fmt_entry ../../progs/dump_entry.c:907

  This frame has 2 object(s):
    [32, 43) 'boxchars'
    [96, 4212) 'buffer' <== Memory access at offset 4212 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow ../../progs/dump_entry.c:1144 fmt_entry
Shadow bytes around the buggy address:
  0x10007fff5780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff5790: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff57a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff57b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff57c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10007fff57d0: 00 00 00 00 00 00 00 00 00 00 00 00[04]f4 f3 f3
  0x10007fff57e0: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff57f0: 00 00 00 00 f1 f1 f1 f1 04 f4 f4 f4 f2 f2 f2 f2
  0x10007fff5800: 04 f4 f4 f4 f2 f2 f2 f2 00 00 00 00 00 00 00 00
  0x10007fff5810: 00 f4 f4 f4 f2 f2 f2 f2 00 00 00 00 00 00 00 00
  0x10007fff5820: 00 00 f4 f4 f2 f2 f2 f2 00 00 00 00 00 00 00 00
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
==19468==ABORTING

	



	



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