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Fix CVE-2016-6321:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6321
https://security-tracker.debian.org/tracker/CVE-2016-6321
Patch adapted from upstream source repository (the changes to 'NEWS'
don't apply to the Tar 1.29 release tarball).
http://git.savannah.gnu.org/cgit/tar.git/commit/?id=7340f67b9860ea0531c1450e5aa261c50f67165d
From 7340f67b9860ea0531c1450e5aa261c50f67165d Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@Penguin.CS.UCLA.EDU>
Date: Sat, 29 Oct 2016 21:04:40 -0700
Subject: [PATCH] When extracting, skip ".." members
* NEWS: Document this.
* src/extract.c (extract_archive): Skip members whose names
contain "..".
---
NEWS | 8 +++++++-
src/extract.c | 8 ++++++++
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/src/extract.c b/src/extract.c
index f982433..7904148 100644
--- a/src/extract.c
+++ b/src/extract.c
@@ -1629,12 +1629,20 @@ extract_archive (void)
{
char typeflag;
tar_extractor_t fun;
+ bool skip_dotdot_name;
fatal_exit_hook = extract_finish;
set_next_block_after (current_header);
+ skip_dotdot_name = (!absolute_names_option
+ && contains_dot_dot (current_stat_info.orig_file_name));
+ if (skip_dotdot_name)
+ ERROR ((0, 0, _("%s: Member name contains '..'"),
+ quotearg_colon (current_stat_info.orig_file_name)));
+
if (!current_stat_info.file_name[0]
+ || skip_dotdot_name
|| (interactive_option
&& !confirm ("extract", current_stat_info.file_name)))
{
--
2.11.0
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