Wireshark stack-based out-of-bounds read in nettrace_3gpp_32_423_file_open

The following crash due to a stack-based out-of-bounds read 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 ---
==23220==ERROR: AddressSanitizer: stack-buffer-overflow on address 
0x7fffc04c9c20 at pc 0x00000046cc29 bp 0x7fffc04c99b0 sp 0x7fffc04c9160
READ of size 515 at 0x7fffc04c9c20 thread T0
    #0 0x46cc28 in StrstrCheck(void*, char*, char const*, char const*) llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:314
    #1 0x46d0f7 in __interceptor_strstr llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:328
    #2 0x7fbfa4361585 in nettrace_3gpp_32_423_file_open wireshark/wiretap/nettrace_3gpp_32_423.c:986:13
    #3 0x7fbfa429fc7c in wtap_open_offline wireshark/wiretap/file_access.c:913:11
    #4 0x51dd9d in cf_open wireshark/tshark.c:4195:9
    #5 0x5178cb in main wireshark/tshark.c:2188:9

Address 0x7fffc04c9c20 is located in stack of thread T0 at offset 544 in frame
    #0 0x7fbfa43611ff in nettrace_3gpp_32_423_file_open wireshark/wiretap/nettrace_3gpp_32_423.c:964

  This frame has 1 object(s):
    [32, 544) 'magic_buf' <== Memory access at offset 544 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/../sanitizer_common/sanitizer_common_intercep
tors.inc:314 in StrstrCheck(void*, char*, char const*, char const*)
Shadow bytes around the buggy address:
  0x100078091330: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100078091340: f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 00
  0x100078091350: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100078091360: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100078091370: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x100078091380: 00 00 00 00[f3]f3 f3 f3 f3 f3 f3 f3 00 00 00 00
  0x100078091390: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000780913a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000780913b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000780913c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000780913d0: f1 f1 f1 f1 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
==23220==ABORTING
--- cut ---

The crash was reported at 
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11982. Attached are three 
files which trigger the crash.

This bug is subject to a 90 day disclosure deadline. If 90 days elapse without 
a broadly available patch, then the bug report will automatically become 
visible to the public.
Original issue reported on code.google.com by mjurc...@google.com on 8 Jan 2016 at 11:28
Attachments:
DasBrain / google-security-research

Wireshark stack-based out-of-bounds read in nettrace_3gpp_32_423_file_open #694
