Headline
CVE-2022-1733: Heap-based Buffer Overflow in function skip_string in vim
Heap-based Buffer Overflow in GitHub repository vim/vim prior to 8.2.4968.
Description
Heap-based Buffer Overflow in function skip_string at cindent.c:92
vim version
git log
commit 5a8fad32ea9c075f045b37d6c7739891d458f82b (HEAD -> master, tag: v8.2.4962, origin/master, origin/HEAD)
POC
./vim -u NONE -i NONE -n -m -X -Z -e -s -S /mnt/share/max/fuzz/poc/vim/poc_h7_s.dat -c :qa!
=================================================================
==17385==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x621000013d00 at pc 0x000000566e15 bp 0x7ffe2cab62e0 sp 0x7ffe2cab62d8
READ of size 1 at 0x621000013d00 thread T0
#0 0x566e14 in skip_string /home/fuzz/fuzz/vim/vim/src/cindent.c:92:10
#1 0x5893c2 in find_last_paren /home/fuzz/fuzz/vim/vim/src/cindent.c:1155:12
#2 0x58dfa6 in cin_isfuncdecl /home/fuzz/fuzz/vim/vim/src/cindent.c:1201:9
#3 0x580d15 in get_c_indent /home/fuzz/fuzz/vim/vim/src/cindent.c:3835:6
#4 0x9999a1 in op_reindent /home/fuzz/fuzz/vim/vim/src/indent.c:1104:16
#5 0xbab439 in do_pending_operator /home/fuzz/fuzz/vim/vim/src/ops.c:4072:3
#6 0xb1a7a5 in normal_cmd /home/fuzz/fuzz/vim/vim/src/normal.c:952:2
#7 0x80ebde in exec_normal /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:8757:6
#8 0x80e408 in exec_normal_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:8720:5
#9 0x80dfb9 in ex_normal /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:8638:6
#10 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
#11 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
#12 0xe5191c in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1674:5
#13 0xe4e376 in do_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1801:12
#14 0xe4dcac in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1174:14
#15 0xe4d38e in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
#16 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
#17 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
#18 0x7c8f31 in do_cmdline_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:586:12
#19 0x1419502 in exe_commands /home/fuzz/fuzz/vim/vim/src/main.c:3108:2
#20 0x141569b in vim_main2 /home/fuzz/fuzz/vim/vim/src/main.c:780:2
#21 0x140ad95 in main /home/fuzz/fuzz/vim/vim/src/main.c:432:12
#22 0x7fe4d382b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
#23 0x41ea6d in _start (/home/fuzz/fuzz/vim/vim/src/vim+0x41ea6d)
0x621000013d00 is located 0 bytes to the right of 4096-byte region [0x621000012d00,0x621000013d00)
allocated by thread T0 here:
#0 0x499ccd in malloc (/home/fuzz/fuzz/vim/vim/src/vim+0x499ccd)
#1 0x4cb3aa in lalloc /home/fuzz/fuzz/vim/vim/src/alloc.c:246:11
#2 0x4cb28a in alloc /home/fuzz/fuzz/vim/vim/src/alloc.c:151:12
#3 0x1422fb5 in mf_alloc_bhdr /home/fuzz/fuzz/vim/vim/src/memfile.c:884:21
#4 0x1421dc7 in mf_new /home/fuzz/fuzz/vim/vim/src/memfile.c:375:26
#5 0xa5be28 in ml_new_data /home/fuzz/fuzz/vim/vim/src/memline.c:4082:15
#6 0xa5a7d1 in ml_open /home/fuzz/fuzz/vim/vim/src/memline.c:394:15
#7 0x4fddba in open_buffer /home/fuzz/fuzz/vim/vim/src/buffer.c:186:9
#8 0x1416d4c in create_windows /home/fuzz/fuzz/vim/vim/src/main.c:2877:9
#9 0x141501a in vim_main2 /home/fuzz/fuzz/vim/vim/src/main.c:711:5
#10 0x140ad95 in main /home/fuzz/fuzz/vim/vim/src/main.c:432:12
#11 0x7fe4d382b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/fuzz/fuzz/vim/vim/src/cindent.c:92:10 in skip_string
Shadow bytes around the buggy address:
0x0c427fffa750: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffa760: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffa770: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffa780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffa790: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c427fffa7a0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffa7b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffa7c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffa7d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffa7e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffa7f0: 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
Shadow gap: cc
==17385==ABORTING
poc_h7_s.dat
Impact
This vulnerabilities are capable of crashing software, Modify Memory, and possible remote execution
Occurrences
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