7.1 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
5.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:N/A:P
0.001 Low
EPSS
Percentile
27.8%
Out-of-bound read data in function suggest_trie_walk()
abusing array byts
in line spellsuggest.c:1925
Tested version: v8.2.5166
commit f65cc665fa751bad3ffe75f58ce1251d6695949f (HEAD -> master, tag: v8.2.5166, origin/master, origin/HEAD)
Author: Bram Moolenaar <[email protected]>
Date: Sun Jun 26 18:17:50 2022 +0100
patch 8.2.5166: test for DiffUpdated fails
Problem: Test for DiffUpdated fails.
Solution: Also accept a count of two.
./vim -u NONE -i NONE -n -m -X -Z -e -s -S ./hbo_03.dat -c :qa!
==1678955==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x604000001378 at pc 0x000000d4d253 bp 0x7ffed359e3d0 sp 0x7ffed359e3c8
READ of size 1 at 0x604000001378 thread T0
#0 0xd4d252 in suggest_trie_walk /home/h4niz/fuzz/vim/sync_dirs/vim/src/spellsuggest.c:1925:7
#1 0xd31bc1 in suggest_try_change /home/h4niz/fuzz/vim/sync_dirs/vim/src/spellsuggest.c:1217:2
#2 0xd31bc1 in spell_suggest_intern /home/h4niz/fuzz/vim/sync_dirs/vim/src/spellsuggest.c:1013:5
#3 0xd31bc1 in spell_find_suggest /home/h4niz/fuzz/vim/sync_dirs/vim/src/spellsuggest.c:888:6
#4 0xd2e061 in spell_suggest /home/h4niz/fuzz/vim/sync_dirs/vim/src/spellsuggest.c:554:5
#5 0x9fa872 in nv_zet /home/h4niz/fuzz/vim/sync_dirs/vim/src/normal.c:3007:7
#6 0x9c13b4 in normal_cmd /home/h4niz/fuzz/vim/sync_dirs/vim/src/normal.c:939:5
#7 0x75d852 in exec_normal /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c
#8 0x75c37a in exec_normal_cmd /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c:8775:5
#9 0x75c37a in ex_normal /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c:8693:6
#10 0x72f8f6 in do_one_cmd /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c:2570:2
#11 0x72f8f6 in do_cmdline /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c:992:17
#12 0x71b247 in global_exe_one /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_cmds.c
#13 0x71b247 in global_exe /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_cmds.c:5087:2
#14 0x71a89c in ex_global /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_cmds.c:5048:6
#15 0x72f8f6 in do_one_cmd /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c:2570:2
#16 0x72f8f6 in do_cmdline /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c:992:17
#17 0xc79dbd in do_source_ext /home/h4niz/fuzz/vim/sync_dirs/vim/src/scriptfile.c:1674:5
#18 0xc77683 in do_source /home/h4niz/fuzz/vim/sync_dirs/vim/src/scriptfile.c:1801:12
#19 0xc77683 in cmd_source /home/h4niz/fuzz/vim/sync_dirs/vim/src/scriptfile.c:1174:14
#20 0x72f8f6 in do_one_cmd /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c:2570:2
#21 0x72f8f6 in do_cmdline /home/h4niz/fuzz/vim/sync_dirs/vim/src/ex_docmd.c:992:17
#22 0x10c7796 in exe_commands /home/h4niz/fuzz/vim/sync_dirs/vim/src/main.c:3133:2
#23 0x10c7796 in vim_main2 /home/h4niz/fuzz/vim/sync_dirs/vim/src/main.c:780:2
#24 0x10c37a0 in main /home/h4niz/fuzz/vim/sync_dirs/vim/src/main.c:432:12
#25 0x7f7628d43082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082)
#26 0x422ebd in _start (/home/h4niz/fuzz/vim/latest_vim/vim+0x422ebd)
0x604000001378 is located 0 bytes to the right of 40-byte region [0x604000001350,0x604000001378)
allocated by thread T0 here:
#0 0x49adbd in malloc (/home/h4niz/fuzz/vim/latest_vim/vim+0x49adbd)
#1 0x4ca9ce in lalloc /home/h4niz/fuzz/vim/sync_dirs/vim/src/alloc.c:246:11
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/h4niz/fuzz/vim/sync_dirs/vim/src/spellsuggest.c:1925:7 in suggest_trie_walk
Shadow bytes around the buggy address:
0x0c087fff8210: fa fa fd fd fd fd fd fd fa fa fd fd fd fd fd fa
0x0c087fff8220: fa fa fd fd fd fd fd fd fa fa fd fd fd fd fd fd
0x0c087fff8230: fa fa fd fd fd fd fd fa fa fa 00 00 00 00 05 fa
0x0c087fff8240: fa fa fd fd fd fd fd fa fa fa 00 00 00 00 05 fa
0x0c087fff8250: fa fa fd fd fd fd fd fa fa fa fd fd fd fd fd fd
=>0x0c087fff8260: fa fa fd fd fd fd fd fd fa fa 00 00 00 00 00[fa]
0x0c087fff8270: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
0x0c087fff8280: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
0x0c087fff8290: fa fa 00 00 00 00 00 00 fa fa fd fd fd fd fd fa
0x0c087fff82a0: fa fa fd fd fd fd fd fa fa fa fd fd fd fd fd fd
0x0c087fff82b0: fa fa fd fd fd fd fd fa fa fa fd fd fd fd fd 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
Shadow gap: cc
==1678955==ABORTING
Download POC: hbo_03.dat
7.1 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
5.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:N/A:P
0.001 Low
EPSS
Percentile
27.8%