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patch: apply upstream patch for CVE-2019-13638

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GNU patch through 2.7.6 is vulnerable to OS shell command injection that
can be exploited by opening a crafted patch file that contains an ed style
diff payload with shell metacharacters. The ed editor does not need to be
present on the vulnerable system. This is different from CVE-2018-1000156.

https://nvd.nist.gov/vuln/detail/CVE-2019-13638

Signed-off-by: Russell Senior <russell@personaltelco.net>
(cherry-picked from b82198ff47)
This commit is contained in:
Russell Senior 2019-08-11 12:43:41 -07:00 committed by Rosen Penev
parent d91bbb1971
commit 89b362e22b
No known key found for this signature in database
GPG key ID: 36D31CFA845F0E3B
2 changed files with 39 additions and 1 deletions
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2
devel/patch/Makefile
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@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=patch
PKG_VERSION:=2.7.6
PKG_RELEASE:=4
PKG_RELEASE:=5
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
PKG_SOURCE_URL:=@GNU/patch

38
devel/patch/patches/060-CVE-2019-13638.patch Normal file
View file

@ -0,0 +1,38 @@
From 3fcd042d26d70856e826a42b5f93dc4854d80bf0 Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruen@gnu.org>
Date: Fri, 6 Apr 2018 19:36:15 +0200
Subject: Invoke ed directly instead of using the shell
* src/pch.c (do_ed_script): Invoke ed directly instead of using a shell
command to avoid quoting vulnerabilities.
---
src/pch.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/src/pch.c b/src/pch.c
index 4fd5a05..16e001a 100644
--- a/src/pch.c
+++ b/src/pch.c
@@ -2459,9 +2459,6 @@ do_ed_script (char const *inname, char const *outname,
*outname_needs_removal = true;
copy_file (inname, outname, 0, exclusive, instat.st_mode, true);
}
- sprintf (buf, "%s %s%s", editor_program,
- verbosity == VERBOSE ? "" : "- ",
- outname);
fflush (stdout);
pid = fork();
@@ -2470,7 +2467,8 @@ do_ed_script (char const *inname, char const *outname,
else if (pid == 0)
{
dup2 (tmpfd, 0);
- execl ("/bin/sh", "sh", "-c", buf, (char *) 0);
+ assert (outname[0] != '!' && outname[0] != '-');
+ execlp (editor_program, editor_program, "-", outname, (char *) NULL);
_exit (2);
}
else
--
cgit v1.0-41-gc330