BUG report

[Sunzyuu]

I was recently using fuzz to conduct security testing on hashset, and found a stack overflow error in cap2hccapx.bin. The specific information is as follows:

./cap2hccapx.bin poc  /dev/null

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=================================================================
==32351==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fffffffe18f at pc 0x0000004d1324 bp 0x7ffffffedab0 sp 0x7ffffffedaa8
READ of size 2 at 0x7fffffffe18f thread T0
    #0 0x4d1323 in process_packet /work/autofz/github/hashcat-utils/src/cap2hccapx.c:741:50
    #1 0x4d1323 in main /work/autofz/github/hashcat-utils/src/cap2hccapx.c:1118:5
    #2 0x7ffff6ee583f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
    #3 0x41c068 in _start (/work/autofz/github/hashcat-utils/src/cap2hccapx.bin+0x41c068)

Address 0x7fffffffe18f is located in stack of thread T0 at offset 66511 in frame
    #0 0x4c874f in main /work/autofz/github/hashcat-utils/src/cap2hccapx.c:875

  This frame has 10 object(s):
    [32, 64) 'zero.i.i' (line 593)
    [96, 195) 'auth_packet_orig.i.i' (line 612)
    [240, 290) 'essid.i' (line 747)
    [336, 675) 'excpkt.i' (line 855)
    [752, 758) 'bssid.i' (line 675)
    [784, 834) 'essid' (line 902)
    [880, 904) 'pcap_file_header' (line 924)
    [944, 960) 'header' (line 987)
    [976, 66511) 'packet' (line 1017) <== Memory access at offset 66511 overflows this variable
    [66768, 67161) 'hccapx' (line 1288)
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /work/autofz/github/hashcat-utils/src/cap2hccapx.c:741:50 in process_packet
Shadow bytes around the buggy address:
  0x10007fff7be0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff7bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff7c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff7c10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff7c20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10007fff7c30: 00[07]f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2
  0x10007fff7c40: f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2
  0x10007fff7c50: f2 f2 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
  0x10007fff7c60: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
  0x10007fff7c70: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
  0x10007fff7c80: f8 f8 f8 f8 f3 f3 f3 f3 f3 f3 f3 f3 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
  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
==32351==ABORTING

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The poc that triggers the error is as follows：https://github.com/Sunzyuu/seed/blob/main/hashset_cap2hccapx_poc
I hope my report will be of some help to hashset, thank you！