Wireshark – ascend_seek Static Out-of-Bounds Read

  • 作者： Google Security Research
    日期： 2015-12-16
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/39001/
  • Source: https://code.google.com/p/google-security-research/issues/detail?id=646

The following crash due to a static 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"):

Attached are three files which trigger the crash.

--- cut ---
==5629==ERROR: AddressSanitizer: global-buffer-overflow on address 0x0000044bf7e6 at pc 0x0000009eb451 bp 0x7ffcd2fd6050 sp 0x7ffcd2fd6048
READ of size 1 at 0x0000044bf7e6 thread T0
#0 0x9eb450 in ascend_seek wireshark/wiretap/ascendtext.c:105:19
#1 0x9ea5e0 in ascend_open wireshark/wiretap/ascendtext.c:167:12
#2 0x83f7c6 in wtap_open_offline wireshark/wiretap/file_access.c:1042:13
#3 0x53214d in cf_open wireshark/tshark.c:4195:9
#4 0x52bc7e in main wireshark/tshark.c:2188:9

0x0000044bf7e6 is located 58 bytes to the left of global variable '<string literal>' defined in 'ascendtext.c:61:25' (0x44bf820) of size 10
'<string literal>' is ascii string 'PRI-XMIT-'
0x0000044bf7e6 is located 0 bytes to the right of global variable '<string literal>' defined in 'ascendtext.c:117:30' (0x44bf7e0) of size 6
'<string literal>' is ascii string 'Date:'
SUMMARY: AddressSanitizer: global-buffer-overflow wireshark/wiretap/ascendtext.c:105:19 in ascend_seek
Shadow bytes around the buggy address:
0x00008088fea0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00008088feb0: 00 00 00 00 05 f9 f9 f9 f9 f9 f9 f9 00 00 00 00
0x00008088fec0: 00 00 00 01 f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9
0x00008088fed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00008088fee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x00008088fef0: 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9[06]f9 f9 f9
0x00008088ff00: f9 f9 f9 f9 00 02 f9 f9 f9 f9 f9 f9 00 01 f9 f9
0x00008088ff10: f9 f9 f9 f9 06 f9 f9 f9 f9 f9 f9 f9 06 f9 f9 f9
0x00008088ff20: f9 f9 f9 f9 06 f9 f9 f9 f9 f9 f9 f9 06 f9 f9 f9
0x00008088ff30: f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 07 f9 f9 f9
0x00008088ff40: f9 f9 f9 f9 00 00 01 f9 f9 f9 f9 f9 06 f9 f9 f9
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
==5629==ABORTING
--- cut ---

The crash was reported at https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11794. Attached are three files which trigger the crash.


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39001.zip