From bcfd1d76852974170780dbe368e6194dbb0e123e Mon Sep 17 00:00:00 2001 From: Russell Senior Date: Sun, 11 Aug 2019 13:57:08 -0700 Subject: [PATCH] tools/patch: apply upstream patch for cve-2019-13638 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 --- 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 +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 +