Wireshark – file_read ‘wtap_read_bytes_or_eof/mp2t_find_next_pcr’ Stack Buffer Overflow

• Exploit Database
• 13 阅读

• 作者： Google Security Research
  日期： 2015-12-16
• 类别：

  • dos
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/38997/

• Source: https://code.google.com/p/google-security-research/issues/detail?id=655
  
  The following crash due to a stack-based buffer overflow can be observed in an ASAN build of Wireshark (current git master), by feeding a malformed file to tshark ("$ ./tshark -nVxr /path/to/file"):
  
  --- cut ---
  ==3325==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff80063d1c at pc 0x0000004aaf56 bp 0x7fff80063a50 sp 0x7fff80063200
  WRITE of size 202 at 0x7fff80063d1c thread T0
  #0 0x4aaf55 in __asan_memcpy llvm/projects/compiler-rt/lib/asan/asan_interceptors.cc:393
  #1 0x7fb265728fad in file_read wireshark/wiretap/file_wrappers.c:1222:13
  #2 0x7fb2658ae866 in wtap_read_bytes_or_eof wireshark/wiretap/wtap.c:1363:15
  #3 0x7fb265783fac in mp2t_find_next_pcr wireshark/wiretap/mp2t.c:178:14
  #4 0x7fb265782bfa in mp2t_bits_per_second wireshark/wiretap/mp2t.c:236:10
  #5 0x7fb2657823a0 in mp2t_open wireshark/wiretap/mp2t.c:363:14
  #6 0x7fb265716911 in wtap_open_offline wireshark/wiretap/file_access.c:1042:13
  #7 0x51bd1d in cf_open wireshark/tshark.c:4195:9
  #8 0x51584e in main wireshark/tshark.c:2188:9
  
  Address 0x7fff80063d1c is located in stack of thread T0 at offset 220 in frame
  #0 0x7fb265783cdf in mp2t_find_next_pcr wireshark/wiretap/mp2t.c:170
  
  This frame has 1 object(s):
  [32, 220) 'buffer' <== Memory access at offset 220 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 llvm/projects/compiler-rt/lib/asan/asan_interceptors.cc:393 in __asan_memcpy
  Shadow bytes around the buggy address:
  0x100070004750: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100070004760: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100070004770: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100070004780: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00
  0x100070004790: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  =>0x1000700047a0: 00 00 00[04]f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00
  0x1000700047b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000700047c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000700047d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000700047e0: f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 02 f2 02 f2
  0x1000700047f0: 04 f3 f3 f3 00 00 00 00 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
  Left alloca redzone: ca
  Right alloca redzone:cb
  ==3325==ABORTING
  --- cut ---
  
  The crash was reported at https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11820. Attached are two files which trigger the crash.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38997.zip