Wireshark – ‘find_signature’ Heap Out-of-Bounds Read

  • 作者： Google Security Research
    日期： 2018-12-04
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/45951/
  • The following crash due to a heap-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 ---
==35788==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62d0000e4400 at pc 0x7f326122bbcc bp 0x7ffef079bc70 sp 0x7ffef079bc68
READ of size 1 at 0x62d0000e4400 thread T0
#0 0x7f326122bbcb in find_signature wireshark/wiretap/vwr.c:3194:13
#1 0x7f32612233e5 in vwr_read_s3_W_rec wireshark/wiretap/vwr.c:2160:19
#2 0x7f32612233e5 in vwr_process_rec_data wireshark/wiretap/vwr.c:3356
#3 0x7f326121acf6 in vwr_read wireshark/wiretap/vwr.c:870:10
#4 0x7f326122e989 in wtap_read wireshark/wiretap/wtap.c:1256:7
#5 0x55da2a01be4f in process_cap_file wireshark/tshark.c:3396:12
#6 0x55da2a01be4f in real_main wireshark/tshark.c:2046

0x62d0000e4400 is located 0 bytes to the right of 32768-byte region [0x62d0000dc400,0x62d0000e4400)
allocated by thread T0 here:
#0 0x55da29fd30c0 in malloc (wireshark/tshark+0x1120c0)

SUMMARY: AddressSanitizer: heap-buffer-overflow wireshark/wiretap/vwr.c:3194:13 in find_signature
Shadow bytes around the buggy address:
0x0c5a80014830: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a80014840: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a80014850: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a80014860: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a80014870: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c5a80014880:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a80014890: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a800148a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a800148b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a800148c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a800148d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
==35788==ABORTING
--- cut ---

The crash was reported at https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15279. Attached are three files which trigger the crash.


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/45951.zip