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[OpenWrt-Devel] tools/patch: apply upstream patch for cve-2019-13638

Message ID 87mugfe7yz.fsf@husum.klickitat.com
State Accepted
Delegated to: Petr Štetiar
Headers show
Series [OpenWrt-Devel] tools/patch: apply upstream patch for cve-2019-13638 | expand

Commit Message

Russell Senior Aug. 11, 2019, 8:57 p.m. UTC 
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
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Patch

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>
---
 tools/patch/Makefile                         |  2 +-
 tools/patch/patches/060-CVE-2019-13638.patch | 38 ++++++++++++++++++++
 2 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100644 tools/patch/patches/060-CVE-2019-13638.patch

diff --git a/tools/patch/Makefile b/tools/patch/Makefile
index 3bcf668b04..e0481204f7 100644
--- a/tools/patch/Makefile
+++ b/tools/patch/Makefile
@@ -8,7 +8,7 @@  include $(TOPDIR)/rules.mk
 
 PKG_NAME:=patch
 PKG_VERSION:=2.7.6
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 PKG_CPE_ID:=cpe:/a:gnu:patch
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
diff --git a/tools/patch/patches/060-CVE-2019-13638.patch b/tools/patch/patches/060-CVE-2019-13638.patch
new file mode 100644
index 0000000000..38caff628a
--- /dev/null
+++ b/tools/patch/patches/060-CVE-2019-13638.patch
@@ -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
+