CVE-2026-35177 vim: Vim zip.vim plugin: Arbitrary file overwrite via path traversal bypass
Resolves: RHEL-170137
This commit is contained in:
Zdenek Dohnal
parent
11866d958e
commit
cfc5a4abc6
@ -0,0 +1,48 @@
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From 7088926316d8d4a7572a242d0765e99adfc8b083 Mon Sep 17 00:00:00 2001
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From: Christian Brabandt <cb@256bit.org>
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Date: Wed, 1 Apr 2026 16:23:49 +0000
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Subject: [PATCH] patch 9.2.0280: [security]: path traversal issue in zip.vim
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Problem: [security]: path traversal issue in zip.vim
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Solution: Detect more such attacks and warn the user.
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Github Advisory:
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https://github.com/vim/vim/security/advisories/GHSA-jc86-w7vm-8p24
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Signed-off-by: Christian Brabandt <cb@256bit.org>
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---
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runtime/autoload/zip.vim | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/runtime/autoload/zip.vim b/runtime/autoload/zip.vim
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--- a/runtime/autoload/zip.vim
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+++ b/runtime/autoload/zip.vim
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@@ -278,6 +278,13 @@ fun! zip#Write(fname)
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return
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endif
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+ if simplify(a:fname) =~ '\.\.[/\\]'
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+ redraw!
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+ echohl Error | echo "***error*** (zip#Write) Path Traversal Attack detected, not writing!" | echohl None
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+ let &report= repkeep
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+ return
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+ endif
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+
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let curdir= getcwd()
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let tmpdir= tempname()
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" call Decho("orig tempname<".tmpdir.">")
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@@ -400,7 +407,7 @@ fun! zip#Extract()
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let &report= repkeep
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" call Dret("zip#Extract")
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return
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- elseif fname =~ '^[.]\?[.]/'
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+ elseif fname =~ '^[.]\?[.]/' || simplify(fname) =~ '\.\.[/\\]'
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redraw!
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echohl Error | echo "***error*** (zip#Browse) Path Traversal Attack detected, not extracting!" | echohl None
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let &report= repkeep
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--
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2.49.0
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51
0001-patch-9.2.0299-zip-may-write-using-absolute-paths.patch
Normal file
51
0001-patch-9.2.0299-zip-may-write-using-absolute-paths.patch
Normal file
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From 46f530e517bd1b59acc2eb0d2aa76d02e54ca9fe Mon Sep 17 00:00:00 2001
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From: Christian Brabandt <cb@256bit.org>
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Date: Sun, 5 Apr 2026 15:58:00 +0000
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Subject: [PATCH] patch 9.2.0299: runtime(zip): may write using absolute paths
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Problem: runtime(zip): may write using absolute paths
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(syndicate)
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Solution: Detect this case and abort on Unix, warn in the documentation
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about possible issues
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Signed-off-by: Christian Brabandt <cb@256bit.org>
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---
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runtime/autoload/zip.vim | 8 ++++++++
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runtime/doc/pi_zip.txt | 4 ++++
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2 files changed, 12 insertions(+)
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diff --git a/runtime/autoload/zip.vim b/runtime/autoload/zip.vim
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--- a/runtime/autoload/zip.vim
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+++ b/runtime/autoload/zip.vim
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@@ -313,6 +313,14 @@ fun! zip#Write(fname)
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if has("unix")
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let zipfile = substitute(a:fname,'zipfile:\(.\{-}\)::[^\\].*$','\1','')
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let fname = substitute(a:fname,'zipfile:.\{-}::\([^\\].*\)$','\1','')
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+ " fname should not start with a leading slash to avoid writing anywhere into the system
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+ if fname =~ '^/'
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+ redraw!
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+ echohl Error | echo "***error*** (zip#Write) Path Traversal Attack detected, not writing!" | echohl None
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+ call s:ChgDir(curdir,s:WARNING,"(zip#Write) unable to return to ".curdir."!")
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+ let &report= repkeep
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+ return
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+ endif
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else
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let zipfile = substitute(a:fname,'^.\{-}zipfile:\(.\{-}\)::[^\\].*$','\1','')
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let fname = substitute(a:fname,'^.\{-}zipfile:.\{-}::\([^\\].*\)$','\1','')
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diff --git a/runtime/doc/pi_zip.txt b/runtime/doc/pi_zip.txt
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--- a/runtime/doc/pi_zip.txt
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+++ b/runtime/doc/pi_zip.txt
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@@ -32,6 +32,10 @@
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the desired file, then hit the <return> key. After editing, one may
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also write to the file. Currently, one may not make a new file in
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zip archives via the plugin.
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+
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+ The zip plugin tries to detect some common path traversal attack
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+ patterns, but it may not catch all possible cases. Please be very
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+ careful when using this plugin with untrusted input.
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COMMANDS~
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*zip-x*
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--
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2.49.0
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@ -0,0 +1,45 @@
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From 351a16c88f56aeeca5e06095624dd701b264b2a9 Mon Sep 17 00:00:00 2001
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From: q1uf3ng <q1uf3ng@protone.me>
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Date: Wed, 15 Apr 2026 04:03:02 +0000
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Subject: [PATCH] runtime(zip): block absolute paths in zip#Extract
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zip#Extract(): add absolute path checks for both Unix and Windows,
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matching the existing checks in zip#Write().
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closes: #19976
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Signed-off-by: q1uf3ng <glna9@protonmail.com>
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Signed-off-by: Christian Brabandt <cb@256bit.org>
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---
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runtime/autoload/zip.vim | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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diff --git a/runtime/autoload/zip.vim b/runtime/autoload/zip.vim
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--- a/runtime/autoload/zip.vim
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+++ b/runtime/autoload/zip.vim
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@@ -421,6 +421,22 @@ fun! zip#Extract()
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let &report= repkeep
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return
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endif
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+ " block absolute paths
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+ if has("unix")
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+ if fname =~ '^/'
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+ redraw!
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+ echohl Error | echo "***error*** (zip#Extract) Path Traversal Attack detected, not extracting!" | echohl None
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+ let &report= repkeep
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+ return
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+ endif
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+ else
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+ if fname =~ '^\%(\a:[\\/]\|[\\/]\)'
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+ redraw!
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+ echohl Error | echo "***error*** (zip#Extract) Path Traversal Attack detected, not extracting!" | echohl None
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+ let &report= repkeep
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+ return
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+ endif
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+ endif
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" extract the file mentioned under the cursor
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" call Decho("system(".g:zip_extractcmd." ".shellescape(b:zipfile)." ".shellescape(shell).")")
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--
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2.49.0
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17
vim.spec
17
vim.spec
@ -27,7 +27,7 @@ Summary: The VIM editor
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URL: http://www.vim.org/
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Name: vim
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Version: %{baseversion}.%{patchlevel}
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Release: 28%{?dist}
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Release: 29%{?dist}
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License: Vim and MIT
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Source0: ftp://ftp.vim.org/pub/vim/unix/vim-%{baseversion}-%{patchlevel}.tar.bz2
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Source1: virc
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@ -175,6 +175,14 @@ Patch3064: 0001-patch-9.2.0077-security-Crash-when-recovering-a-corr.patch
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# RHEL: https://redhat.atlassian.net/browse/RHEL-159631
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# Upstream: https://github.com/vim/vim/commit/645ed6597d1ea896c712cd7ddbb6edee79577e9a
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Patch3065: 0001-patch-9.2.0202-security-command-injection-via-newlin.patch
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# RHEL-170137 CVE-2026-35177 vim: Vim zip.vim plugin: Arbitrary file overwrite via path traversal bypass
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# https://redhat.atlassian.net/browse/RHEL-170137
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# https://github.com/vim/vim/commit/7088926316d8
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# https://github.com/vim/vim/commit/46f530e517bd
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# https://github.com/vim/vim/commit/351a16c88f56
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Patch3066: 0001-patch-9.2.0280-security-path-traversal-issue-in-zip.patch
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Patch3067: 0001-patch-9.2.0299-zip-may-write-using-absolute-paths.patch
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Patch3068: 0001-patch-9.2.0304-zip-block-absolute-paths-in-Extract.patch
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# gcc is no longer in buildroot by default
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@ -428,6 +436,9 @@ perl -pi -e "s,bin/nawk,bin/awk,g" runtime/tools/mve.awk
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%patch -P 3063 -p1 -b .check-page-count
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%patch -P 3064 -p1 -b .CVE-2026-28421
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%patch -P 3065 -p1 -b .CVE-2026-33412
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%patch -P 3066 -p1 -b .CVE-2026-35177-zip-path-traversal
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%patch -P 3067 -p1 -b .CVE-2026-35177-zip-absolute-write
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%patch -P 3068 -p1 -b .CVE-2026-35177-zip-absolute-extract
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%build
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cd src
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@ -980,6 +991,10 @@ touch %{buildroot}/%{_datadir}/%{name}/vimfiles/doc/tags
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%endif
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%changelog
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* Wed May 20 2026 Zdenek Dohnal <zdohnal@redhat.com> - 2:8.2.2637-29
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- CVE-2026-35177 vim: Vim zip.vim plugin: Arbitrary file overwrite via path
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traversal bypass
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* Mon Apr 13 2026 Zdenek Dohnal <zdohnal@redhat.com> - 2:8.2.2637-28
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- Resolves: RHEL-159631 vim: Vim: Arbitrary code execution via command injection
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in glob() function
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