diff --git a/SOURCES/git-cve-2017-1000117.patch b/SOURCES/git-cve-2017-1000117.patch
new file mode 100644
index 0000000..ccdfa9c
--- /dev/null
+++ b/SOURCES/git-cve-2017-1000117.patch
@@ -0,0 +1,85 @@
+diff --git a/cache.h b/cache.h
+index 94ca1ac..2ab9ffd 100644
+--- a/cache.h
++++ b/cache.h
+@@ -744,6 +744,14 @@ char *strip_path_suffix(const char *path, const char *suffix);
+ int daemon_avoid_alias(const char *path);
+ int offset_1st_component(const char *path);
+ 
++/*
++ * Returns true iff "str" could be confused as a command-line option when
++ * passed to a sub-program like "ssh". Note that this has nothing to do with
++ * shell-quoting, which should be handled separately; we're assuming here that
++ * the string makes it verbatim to the sub-program.
++ */
++int looks_like_command_line_option(const char *str);
++
+ /* object replacement */
+ #define READ_SHA1_FILE_REPLACE 1
+ extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);
+diff --git a/connect.c b/connect.c
+index 6d4ea13..970f565 100644
+--- a/connect.c
++++ b/connect.c
+@@ -450,6 +450,11 @@ static struct child_process *git_proxy_connect(int fd[2], char *host)
+ 
+ 	get_host_and_port(&host, &port);
+ 
++	if (looks_like_command_line_option(host))
++		die("strange hostname '%s' blocked", host);
++	if (looks_like_command_line_option(port))
++		die("strange port '%s' blocked", port);
++
+ 	argv = xmalloc(sizeof(*argv) * 4);
+ 	argv[0] = git_proxy_command;
+ 	argv[1] = host;
+@@ -613,6 +618,10 @@ struct child_process *git_connect(int fd[2], const char *url_orig,
+ 
+ 	conn = xcalloc(1, sizeof(*conn));
+ 
++	if (looks_like_command_line_option(path))
++		die("strange pathname '%s' blocked", path);
++
++
+ 	strbuf_init(&cmd, MAX_CMD_LEN);
+ 	strbuf_addstr(&cmd, prog);
+ 	strbuf_addch(&cmd, ' ');
+@@ -626,6 +635,10 @@ struct child_process *git_connect(int fd[2], const char *url_orig,
+ 		const char *ssh = getenv("GIT_SSH");
+ 		int putty = ssh && strcasestr(ssh, "plink");
+ 		transport_check_allowed("ssh");
++		if (looks_like_command_line_option(host))
++			die("strange hostname '%s' blocked", host);
++
++
+ 		if (!ssh) ssh = "ssh";
+ 
+ 		*arg++ = ssh;
+diff --git a/path.c b/path.c
+index 04ff148..713d79b 100644
+--- a/path.c
++++ b/path.c
+@@ -701,3 +701,9 @@ int offset_1st_component(const char *path)
+ 		return 2 + is_dir_sep(path[2]);
+ 	return is_dir_sep(path[0]);
+ }
++
++int looks_like_command_line_option(const char *str)
++{
++	return str && str[0] == '-';
++}
++
+diff --git a/t/t5532-fetch-proxy.sh b/t/t5532-fetch-proxy.sh
+index 5531bd1..d3b2651 100755
+--- a/t/t5532-fetch-proxy.sh
++++ b/t/t5532-fetch-proxy.sh
+@@ -40,4 +40,9 @@ test_expect_success 'fetch through proxy works' '
+ 	test_cmp expect actual
+ '
+ 
++test_expect_success 'funny hostnames are rejected before running proxy' '
++	test_must_fail git fetch git://-remote/repo.git 2>stderr &&
++	! grep "proxying for" stderr
++'
++
+ test_done
diff --git a/SPECS/git.spec b/SPECS/git.spec
index 1c5d51d..b63df43 100644
--- a/SPECS/git.spec
+++ b/SPECS/git.spec
@@ -51,7 +51,7 @@
 
 Name:           git
 Version:        1.8.3.1
-Release:        11%{?dist}
+Release:        12%{?dist}
 Summary:        Fast Version Control System
 License:        GPLv2
 Group:          Development/Tools
@@ -89,6 +89,7 @@ Patch13:        0001-http-control-GSSAPI-credential-delegation.patch
 Patch12:        0001-Fix-CVE-2016-2315-CVE-2016-2324.patch
 Patch14:        0007-git-prompt.patch
 Patch15:        0008-Fix-CVE-2017-8386.patch
+Patch16:        git-cve-2017-1000117.patch
 
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
@@ -341,6 +342,7 @@ Requires:       emacs-git = %{version}-%{release}
 %patch13 -p1
 %patch14 -p1
 %patch15 -p1
+%patch16 -p1
 
 %if %{use_prebuilt_docs}
 mkdir -p prebuilt_docs/{html,man}
@@ -666,6 +668,10 @@ rm -rf %{buildroot}
 # No files for you!
 
 %changelog
+* Fri Aug 11 2017 Petr Stodulka <pstodulk@redhat.com> - 1.8.3.1-12
+- prevent command injection via malicious ssh URLs
+  Resolves: CVE-2017-1000117
+
 * Wed May 17 2017 Petr Stodulka <pstodulk@redhat.com> - 1.8.3.1-11
 - dissalow repo names beginning with dash
   Resolves: CVE-2017-8386