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CVE-2022-1785: Out-of-bounds write in function vim_regsub_both in vim

Out-of-bounds Write in GitHub repository vim/vim prior to 8.2.

CVE
#git

Description

Out-of-bounds write in function vim_regsub_both at regexp.c:1954

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_obw_s.dat -c :qa!
=================================================================
==19509==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x606000003175 at pc 0x000000485358 bp 0x7ffcbcc48210 sp 0x7ffcbcc479d0
WRITE of size 2 at 0x606000003175 thread T0
    #0 0x485357 in strcpy (/home/fuzz/fuzz/vim/vim/src/vim+0x485357)
    #1 0xce59a4 in vim_regsub_both /home/fuzz/fuzz/vim/vim/src/regexp.c:1954:3
    #2 0xce9da3 in vim_regsub_multi /home/fuzz/fuzz/vim/vim/src/regexp.c:1897:14
    #3 0x7ae5ad in ex_substitute /home/fuzz/fuzz/vim/vim/src/ex_cmds.c:4521:9
    #4 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
    #5 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
    #6 0xe5191c in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1674:5
    #7 0xe4e376 in do_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1801:12
    #8 0xe4dcac in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1174:14
    #9 0xe4d38e in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
    #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 0x7c8f31 in do_cmdline_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:586:12
    #13 0x1419502 in exe_commands /home/fuzz/fuzz/vim/vim/src/main.c:3108:2
    #14 0x141569b in vim_main2 /home/fuzz/fuzz/vim/vim/src/main.c:780:2
    #15 0x140ad95 in main /home/fuzz/fuzz/vim/vim/src/main.c:432:12
    #16 0x7f9372ae2082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
    #17 0x41ea6d in _start (/home/fuzz/fuzz/vim/vim/src/vim+0x41ea6d)

0x606000003175 is located 0 bytes to the right of 53-byte region [0x606000003140,0x606000003175)
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 0x7ae273 in ex_substitute /home/fuzz/fuzz/vim/vim/src/ex_cmds.c:4486:24
    #4 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
    #5 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
    #6 0xe5191c in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1674:5
    #7 0xe4e376 in do_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1801:12
    #8 0xe4dcac in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1174:14
    #9 0xe4d38e in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
    #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 0x7c8f31 in do_cmdline_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:586:12
    #13 0x1419502 in exe_commands /home/fuzz/fuzz/vim/vim/src/main.c:3108:2
    #14 0x141569b in vim_main2 /home/fuzz/fuzz/vim/vim/src/main.c:780:2
    #15 0x140ad95 in main /home/fuzz/fuzz/vim/vim/src/main.c:432:12
    #16 0x7f9372ae2082 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/vim+0x485357) in strcpy
Shadow bytes around the buggy address:
  0x0c0c7fff85d0: fa fa fa fa fd fd fd fd fd fd fd fa fa fa fa fa
  0x0c0c7fff85e0: fd fd fd fd fd fd fd fd fa fa fa fa 00 00 00 00
  0x0c0c7fff85f0: 00 00 00 00 fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c0c7fff8600: fa fa fa fa 00 00 00 00 00 00 00 fa fa fa fa fa
  0x0c0c7fff8610: 00 00 00 00 00 00 00 fa fa fa fa fa 00 00 00 00
=>0x0c0c7fff8620: 00 00 00 fa fa fa fa fa 00 00 00 00 00 00[05]fa
  0x0c0c7fff8630: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0c7fff8640: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0c7fff8650: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0c7fff8660: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0c7fff8670: 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
==19509==ABORTING

poc_obw_s.dat

Impact

This may result in corruption of sensitive information, a crash, or code execution among other things.

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RHSA-2022:5942: Red Hat Security Advisory: vim security update

An update for vim is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2022-1785: vim: Out-of-bounds Write * CVE-2022-1897: vim: out-of-bounds write in vim_regsub_both() in regexp.c * CVE-2022-1927: vim: buffer over-read in utf_ptr2char() in mbyte.c

RHSA-2022:5813: Red Hat Security Advisory: vim security update

An update for vim is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2022-1785: vim: Out-of-bounds Write * CVE-2022-1897: vim: out-of-bounds write in vim_regsub_both() in regexp.c * CVE-2022-1927: vim: buffer over-read in utf_ptr2char() in mbyte.c

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