Heap-based Buffer Overflow in function ins_compl_add

2022-07-0605:20:52

jieyongma

www.huntr.dev

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

29.6%

JSON

Description

Heap-based Buffer Overflow in function ins_compl_add at insexpand.c:751

vim version

git log
commit 324478037923feef1eb8a771648e38ade9e5e05a (HEAD -&gt; master, tag: v9.0.0042, origin/master, origin/HEAD)

POC

./afl/src/vim -u NONE -i NONE -n -m -X -Z -e -s -S ./poc_hbor4_s.dat -c :qa!
=================================================================
==3114==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61e0000827cb at pc 0x0000009b3131 bp 0x7ffeee1a6850 sp 0x7ffeee1a6848
READ of size 1 at 0x61e0000827cb thread T0
    #0 0x9b3130 in ins_compl_add /home/fuzz/fuzz/vim/afl/src/insexpand.c:751:10
    #1 0x9b1294 in ins_compl_add_infercase /home/fuzz/fuzz/vim/afl/src/insexpand.c:697:12
    #2 0x9d137b in get_next_default_completion /home/fuzz/fuzz/vim/afl/src/insexpand.c:3629:6
    #3 0x9cc7f7 in get_next_completion_match /home/fuzz/fuzz/vim/afl/src/insexpand.c:3694:24
    #4 0x9c9a7e in ins_compl_get_exp /home/fuzz/fuzz/vim/afl/src/insexpand.c:3767:20
    #5 0x9c8438 in find_next_completion_match /home/fuzz/fuzz/vim/afl/src/insexpand.c:4002:21
    #6 0x9c0f04 in ins_compl_next /home/fuzz/fuzz/vim/afl/src/insexpand.c:4103:9
    #7 0x9c197c in ins_complete /home/fuzz/fuzz/vim/afl/src/insexpand.c:4954:9
    #8 0x674939 in edit /home/fuzz/fuzz/vim/afl/src/edit.c:1281:10
    #9 0xb989c7 in op_change /home/fuzz/fuzz/vim/afl/src/ops.c:1758:14
    #10 0xbb25f7 in do_pending_operator /home/fuzz/fuzz/vim/afl/src/ops.c:4041:7
    #11 0xb21ac3 in normal_cmd /home/fuzz/fuzz/vim/afl/src/normal.c:961:2
    #12 0x8156fe in exec_normal /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:8814:6
    #13 0x814f28 in exec_normal_cmd /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:8777:5
    #14 0x814ad9 in ex_normal /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:8695:6
    #15 0x7dda59 in do_one_cmd /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:2570:2
    #16 0x7ca915 in do_cmdline /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:992:17
    #17 0xe5c8fe in do_source_ext /home/fuzz/fuzz/vim/afl/src/scriptfile.c:1674:5
    #18 0xe59396 in do_source /home/fuzz/fuzz/vim/afl/src/scriptfile.c:1801:12
    #19 0xe58cd3 in cmd_source /home/fuzz/fuzz/vim/afl/src/scriptfile.c:1174:14
    #20 0xe583de in ex_source /home/fuzz/fuzz/vim/afl/src/scriptfile.c:1200:2
    #21 0x7dda59 in do_one_cmd /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:2570:2
    #22 0x7ca915 in do_cmdline /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:992:17
    #23 0x7cf591 in do_cmdline_cmd /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:586:12
    #24 0x1427482 in exe_commands /home/fuzz/fuzz/vim/afl/src/main.c:3133:2
    #25 0x142361b in vim_main2 /home/fuzz/fuzz/vim/afl/src/main.c:780:2
    #26 0x1418b2d in main /home/fuzz/fuzz/vim/afl/src/main.c:432:12
    #27 0x7fd83cb66082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
    #28 0x41ea5d in _start (/home/fuzz/fuzz/vim/afl/src/vim+0x41ea5d)

0x61e0000827cb is located 125 bytes to the right of 2766-byte region [0x61e000081c80,0x61e00008274e)
allocated by thread T0 here:
    #0 0x499cbd in malloc (/home/fuzz/fuzz/vim/afl/src/vim+0x499cbd)
    #1 0x4cb392 in lalloc /home/fuzz/fuzz/vim/afl/src/alloc.c:246:11
    #2 0x4cb27a in alloc /home/fuzz/fuzz/vim/afl/src/alloc.c:151:12
    #3 0xf90f0d in vim_strnsave /home/fuzz/fuzz/vim/afl/src/strings.c:44:9
    #4 0x9b349a in ins_compl_add /home/fuzz/fuzz/vim/afl/src/insexpand.c:768:26
    #5 0x9b1294 in ins_compl_add_infercase /home/fuzz/fuzz/vim/afl/src/insexpand.c:697:12
    #6 0x9d137b in get_next_default_completion /home/fuzz/fuzz/vim/afl/src/insexpand.c:3629:6
    #7 0x9cc7f7 in get_next_completion_match /home/fuzz/fuzz/vim/afl/src/insexpand.c:3694:24
    #8 0x9c9a7e in ins_compl_get_exp /home/fuzz/fuzz/vim/afl/src/insexpand.c:3767:20
    #9 0x9c8438 in find_next_completion_match /home/fuzz/fuzz/vim/afl/src/insexpand.c:4002:21
    #10 0x9c0f04 in ins_compl_next /home/fuzz/fuzz/vim/afl/src/insexpand.c:4103:9
    #11 0x9c197c in ins_complete /home/fuzz/fuzz/vim/afl/src/insexpand.c:4954:9
    #12 0x674939 in edit /home/fuzz/fuzz/vim/afl/src/edit.c:1281:10
    #13 0xb989c7 in op_change /home/fuzz/fuzz/vim/afl/src/ops.c:1758:14
    #14 0xbb25f7 in do_pending_operator /home/fuzz/fuzz/vim/afl/src/ops.c:4041:7
    #15 0xb21ac3 in normal_cmd /home/fuzz/fuzz/vim/afl/src/normal.c:961:2
    #16 0x8156fe in exec_normal /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:8814:6
    #17 0x814f28 in exec_normal_cmd /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:8777:5
    #18 0x814ad9 in ex_normal /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:8695:6
    #19 0x7dda59 in do_one_cmd /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:2570:2
    #20 0x7ca915 in do_cmdline /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:992:17
    #21 0xe5c8fe in do_source_ext /home/fuzz/fuzz/vim/afl/src/scriptfile.c:1674:5
    #22 0xe59396 in do_source /home/fuzz/fuzz/vim/afl/src/scriptfile.c:1801:12
    #23 0xe58cd3 in cmd_source /home/fuzz/fuzz/vim/afl/src/scriptfile.c:1174:14
    #24 0xe583de in ex_source /home/fuzz/fuzz/vim/afl/src/scriptfile.c:1200:2
    #25 0x7dda59 in do_one_cmd /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:2570:2
    #26 0x7ca915 in do_cmdline /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:992:17
    #27 0x7cf591 in do_cmdline_cmd /home/fuzz/fuzz/vim/afl/src/ex_docmd.c:586:12
    #28 0x1427482 in exe_commands /home/fuzz/fuzz/vim/afl/src/main.c:3133:2
    #29 0x142361b in vim_main2 /home/fuzz/fuzz/vim/afl/src/main.c:780:2

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/fuzz/fuzz/vim/afl/src/insexpand.c:751:10 in ins_compl_add
Shadow bytes around the buggy address:
  0x0c3c800084a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3c800084b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3c800084c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3c800084d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c3c800084e0: 00 00 00 00 00 00 00 00 00 06 fa fa fa fa fa fa
=&gt;0x0c3c800084f0: fa fa fa fa fa fa fa fa fa[fa]fa fa fa fa fa fa
  0x0c3c80008500: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c3c80008510: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c3c80008520: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c3c80008530: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c3c80008540: 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
==3114==ABORTING