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CVE-2022-1897: 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 4c3d21acaa09d929e6afe10288babe1d0af3de35 (HEAD -> master, tag: v8.2.5014, origin/master, origin/HEAD)

POC

./vim -u NONE -i NONE -n -m -X -Z -e -s -S /mnt/share/max/fuzz/poc/vim/poc_obw2_s.dat -c :qa!
=================================================================
==3392181==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6060000030b5 at pc 0x000000485358 bp 0x7fffffff7330 sp 0x7fffffff6af0
WRITE of size 2 at 0x6060000030b5 thread T0
    #0 0x485357 in strcpy (/home/fuzz/fuzz-vim/vim/src/vim+0x485357)
    #1 0xceb704 in vim_regsub_both /home/fuzz/fuzz/vim/vim/src/regexp.c:1954:3
    #2 0xcefb03 in vim_regsub_multi /home/fuzz/fuzz/vim/vim/src/regexp.c:1897:14
    #3 0x7b3303 in ex_substitute /home/fuzz/fuzz/vim/vim/src/ex_cmds.c:4529:9
    #4 0x7dc2e9 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
    #5 0x7c90a5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
    #6 0xe57b3c in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1674:5
    #7 0xe54596 in do_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1801:12
    #8 0xe53ecc in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1174:14
    #9 0xe535ae in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
    #10 0x7dc2e9 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
    #11 0x7c90a5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
    #12 0x7cdcf1 in do_cmdline_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:586:12
    #13 0x1423d62 in exe_commands /home/fuzz/fuzz/vim/vim/src/main.c:3106:2
    #14 0x141fefb in vim_main2 /home/fuzz/fuzz/vim/vim/src/main.c:780:2
    #15 0x14155f5 in main /home/fuzz/fuzz/vim/vim/src/main.c:432:12
    #16 0x7ffff7bec082 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)

0x6060000030b5 is located 0 bytes to the right of 53-byte region [0x606000003080,0x6060000030b5)
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 0x7b2f67 in ex_substitute /home/fuzz/fuzz/vim/vim/src/ex_cmds.c:4491:24
    #4 0x7dc2e9 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
    #5 0x7c90a5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
    #6 0xe57b3c in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1674:5
    #7 0xe54596 in do_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1801:12
    #8 0xe53ecc in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1174:14
    #9 0xe535ae in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
    #10 0x7dc2e9 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
    #11 0x7c90a5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
    #12 0x7cdcf1 in do_cmdline_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:586:12
    #13 0x1423d62 in exe_commands /home/fuzz/fuzz/vim/vim/src/main.c:3106:2
    #14 0x141fefb in vim_main2 /home/fuzz/fuzz/vim/vim/src/main.c:780:2
    #15 0x14155f5 in main /home/fuzz/fuzz/vim/vim/src/main.c:432:12
    #16 0x7ffff7bec082 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:
  0x0c0c7fff85c0: fd fd fd fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c0c7fff85d0: fa fa fa fa 00 00 00 00 00 00 05 fa fa fa fa fa
  0x0c0c7fff85e0: fd fd fd fd fd fd fd fd fa fa fa fa fd fd fd fd
  0x0c0c7fff85f0: fd fd fd fd fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c0c7fff8600: fa fa fa fa fd fd fd fd fd fd fd fd fa fa fa fa
=>0x0c0c7fff8610: 00 00 00 00 00 00[05]fa fa fa fa fa fa fa fa fa
  0x0c0c7fff8620: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 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
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
==3392181==ABORTING

poc_obw2_s.dat

Impact

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

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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

Ubuntu Security Notice USN-5507-1

Ubuntu Security Notice 5507-1 - It was discovered that Vim incorrectly handled memory access. An attacker could potentially use this issue to cause the program to crash, use unexpected values, or execute arbitrary code. It was discovered that Vim incorrectly handled memory access. An attacker could potentially use this issue to cause the corruption of sensitive information, a crash, or arbitrary code execution.

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