Exploit-DB #38997
Description: Wireshark - file_read 'wtap_read_bytes_or_eof/mp2t_find_next_pcr' Stack Buffer Overflow
Type: dos
Platform: multiple
Date: 2015-12-16
Author: Google Security Research

Exploit:
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:
  0x[PII_REDACTED]0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x[PII_REDACTED]0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x[PII_REDACTED]0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x[PII_REDACTED]0: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00
  0x[PII_REDACTED]0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x[PII_REDACTED]a0: 00 00 00[04]f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00
  0x[PII_REDACTED]b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x[PII_REDACTED]c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x[PII_REDACTED]d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x[PII_REDACTED]e0: f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 02 f2 02 f2
  0x[PII_REDACTED]f0: 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