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CVE-2021-4193 vim: vulnerable to Out-of-bounds Read

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Resolves: CVE-2021-4193
This commit is contained in:
Zdenek Dohnal 2022-01-13 10:49:55 +01:00
parent 825cea52d2
commit b7a801e714
2 changed files with 46 additions and 1 deletions
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39
0001-patch-8.2.3950-going-beyond-the-end-of-the-line-with.patch Normal file
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@ -0,0 +1,39 @@
diff -up vim82/src/charset.c.cve4193 vim82/src/charset.c
--- vim82/src/charset.c.cve4193 2021-03-22 10:02:42.000000000 +0100
+++ vim82/src/charset.c 2022-01-13 10:14:55.634913386 +0100
@@ -1232,10 +1232,15 @@ getvcol(
posptr = NULL; // continue until the NUL
else
{
- // Special check for an empty line, which can happen on exit, when
- // ml_get_buf() always returns an empty string.
- if (*ptr == NUL)
- pos->col = 0;
+ colnr_T i;
+
+ // In a few cases the position can be beyond the end of the line.
+ for (i = 0; i < pos->col; ++i)
+ if (ptr[i] == NUL)
+ {
+ pos->col = i;
+ break;
+ }
posptr = ptr + pos->col;
if (has_mbyte)
// always start on the first byte
diff -up vim82/src/testdir/test_regexp_latin.vim.cve4193 vim82/src/testdir/test_regexp_latin.vim
--- vim82/src/testdir/test_regexp_latin.vim.cve4193 2022-01-13 10:14:55.634913386 +0100
+++ vim82/src/testdir/test_regexp_latin.vim 2022-01-13 10:17:01.905292715 +0100
@@ -938,4 +938,12 @@ func Test_regexp_last_subst_string()
close!
endfunc
+func Test_using_invalid_visual_position()
+ " this was going beyond the end of the line
+ new
+ exe "norm 0o000\<Esc>0\<C-V>$s0"
+ /\%V
+ bwipe!
+endfunc
+
" vim: shiftwidth=2 sts=2 expandtab

8
vim.spec
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@ -27,7 +27,7 @@ Summary: The VIM editor
URL: http://www.vim.org/
Name: vim
Version: %{baseversion}.%{patchlevel}
Release: 9%{?dist}
Release: 10%{?dist}
License: Vim and MIT
Source0: ftp://ftp.vim.org/pub/vim/unix/vim-%{baseversion}-%{patchlevel}.tar.bz2
Source1: virc
@ -84,6 +84,8 @@ Patch3025: 0001-patch-8.2.3487-illegal-memory-access-if-buffer-name-.patch
Patch3026: 0001-patch-8.2.3625-illegal-memory-access-when-C-indentin.patch
# 2028431 - CVE-2021-4019 vim: heap-based buffer overflow in find_help_tags() in src/help.c [rhel-9.0]
Patch3027: 0001-patch-8.2.3669-buffer-overflow-with-long-help-argume.patch
# CVE-2021-4193 vim: vulnerable to Out-of-bounds Read
Patch3028: 0001-patch-8.2.3950-going-beyond-the-end-of-the-line-with.patch
# gcc is no longer in buildroot by default
BuildRequires: gcc
@ -298,6 +300,7 @@ perl -pi -e "s,bin/nawk,bin/awk,g" runtime/tools/mve.awk
%patch3025 -p1 -b .cve-win-redr
%patch3026 -p1 -b .cve3984
%patch3027 -p1 -b .cve4019
%patch3028 -p1 -b .cve4193
%build
cd src
@ -855,6 +858,9 @@ touch %{buildroot}/%{_datadir}/%{name}/vimfiles/doc/tags
%endif
%changelog
* Thu Jan 13 2022 Zdenek Dohnal <zdohnal@redhat.com> - 2:8.2.2637-10
- CVE-2021-4193 vim: vulnerable to Out-of-bounds Read
* Mon Dec 06 2021 Zdenek Dohnal <zdohnal@redhat.com> - 2:8.2.2637-9
- 2028431 - CVE-2021-4019 vim: heap-based buffer overflow in find_help_tags() in src/help.c [rhel-9.0]