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2004976 - CVE-2021-3796 vim: use-after-free in nv_replace() in normal.c [rhel-9.0] 

Resolves: rhbz#2004976
This commit is contained in:
Zdenek Dohnal 2021-10-18 12:30:44 +02:00
parent 937cfb688b
commit 90b5f69d52
2 changed files with 54 additions and 0 deletions
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50
0001-patch-8.2.3428-using-freed-memory-when-replacing.patch Normal file
View File

@ -0,0 +1,50 @@
diff -up vim82/src/normal.c.cve-3796 vim82/src/normal.c
--- vim82/src/normal.c.cve-3796 2021-03-22 10:02:42.000000000 +0100
+++ vim82/src/normal.c 2021-10-15 10:45:21.397258123 +0200
@@ -5076,19 +5076,23 @@ nv_replace(cmdarg_T *cap)
{
/*
* Get ptr again, because u_save and/or showmatch() will have
- * released the line. At the same time we let know that the
- * line will be changed.
+ * released the line. This may also happen in ins_copychar().
+ * At the same time we let know that the line will be changed.
*/
- ptr = ml_get_buf(curbuf, curwin->w_cursor.lnum, TRUE);
if (cap->nchar == Ctrl_E || cap->nchar == Ctrl_Y)
{
int c = ins_copychar(curwin->w_cursor.lnum
+ (cap->nchar == Ctrl_Y ? -1 : 1));
+
+ ptr = ml_get_buf(curbuf, curwin->w_cursor.lnum, TRUE);
if (c != NUL)
ptr[curwin->w_cursor.col] = c;
}
else
+ {
+ ptr = ml_get_buf(curbuf, curwin->w_cursor.lnum, TRUE);
ptr[curwin->w_cursor.col] = cap->nchar;
+ }
if (p_sm && msg_silent == 0)
showmatch(cap->nchar);
++curwin->w_cursor.col;
diff -up vim82/src/testdir/test_edit.vim.cve-3796 vim82/src/testdir/test_edit.vim
--- vim82/src/testdir/test_edit.vim.cve-3796 2021-10-15 10:45:21.398258115 +0200
+++ vim82/src/testdir/test_edit.vim 2021-10-15 10:46:22.892764135 +0200
@@ -1844,4 +1844,16 @@ func Test_read_invalid()
set encoding=utf-8
endfunc
+" Test for getting the character of the line below after "p"
+func Test_edit_put_CTRL_E()
+ set encoding=latin1
+ new
+ let @" = ''
+ sil! norm orggRx
+ sil! norm pr
+ call assert_equal(['r', 'r'], getline(1, 2))
+ bwipe!
+ set encoding=utf-8
+endfunc
+
" vim: shiftwidth=2 sts=2 expandtab

4
vim.spec
View File

@ -74,6 +74,8 @@ Patch3020: 0001-patch-8.2.3290-Vim9-compiling-dict-may-use-pointer-a.patch
Patch3021: vim-cve-var-retab.patch
# 2004893 - CVE-2021-3778 vim: heap-based buffer overflow in utf_ptr2char() in mbyte.c [rhel-9.0]
Patch3022: 0001-patch-8.2.3409-reading-beyond-end-of-line-with-inval.patch
# 2004976 - CVE-2021-3796 vim: use-after-free in nv_replace() in normal.c [rhel-9.0]
Patch3023: 0001-patch-8.2.3428-using-freed-memory-when-replacing.patch
# gcc is no longer in buildroot by default
BuildRequires: gcc
@ -283,6 +285,7 @@ perl -pi -e "s,bin/nawk,bin/awk,g" runtime/tools/mve.awk
%patch3020 -p1 -b .covscan-key-freed
%patch3021 -p1 -b .cve-var-retab
%patch3022 -p1 -b .cve-utf-ptrchar
%patch3023 -p1 -b .cve-nv-replace
%build
cd src
@ -847,6 +850,7 @@ touch %{buildroot}/%{_datadir}/%{name}/vimfiles/doc/tags
- 2011749 - Update test suite to work without default mouse behavior
- 2002320 - CVE-2021-3770 vim: using retab with large value may lead to heap buffer overflow [rhel-9.0]
- 2004893 - CVE-2021-3778 vim: heap-based buffer overflow in utf_ptr2char() in mbyte.c [rhel-9.0]
- 2004976 - CVE-2021-3796 vim: use-after-free in nv_replace() in normal.c [rhel-9.0]
* Tue Aug 10 2021 Mohan Boddu <mboddu@redhat.com> - 2:8.2.2637-5
- Rebuilt for IMA sigs, glibc 2.34, aarch64 flags