[Buildroot] [PATCH] package/openssh: add upstream security fix
Baruch Siach
baruch at tkos.co.il
Tue Jan 15 11:17:53 UTC 2019
Fixes CVE-2018-20685: The scp client allows server to modify permissions
of the target directory by using empty ("D0777 0 \n") or dot ("D0777 0
.\n") directory name.
The bug reporter lists a number of related vulnerabilities that are not
fixed yet:
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
...w-empty-incoming-filename-or-ones-th.patch | 39 +++++++++++++++++++
1 file changed, 39 insertions(+)
create mode 100644 package/openssh/0001-upstream-disallow-empty-incoming-filename-or-ones-th.patch
diff --git a/package/openssh/0001-upstream-disallow-empty-incoming-filename-or-ones-th.patch b/package/openssh/0001-upstream-disallow-empty-incoming-filename-or-ones-th.patch
new file mode 100644
index 000000000000..2b5a958d13b9
--- /dev/null
+++ b/package/openssh/0001-upstream-disallow-empty-incoming-filename-or-ones-th.patch
@@ -0,0 +1,39 @@
+From 6010c0303a422a9c5fa8860c061bf7105eb7f8b2 Mon Sep 17 00:00:00 2001
+From: "djm at openbsd.org" <djm at openbsd.org>
+Date: Fri, 16 Nov 2018 03:03:10 +0000
+Subject: [PATCH] upstream: disallow empty incoming filename or ones that refer
+ to the
+
+current directory; based on report/patch from Harry Sintonen
+
+OpenBSD-Commit-ID: f27651b30eaee2df49540ab68d030865c04f6de9
+Signed-off-by: Baruch Siach <baruch at tkos.co.il>
+---
+Upstream status (openssh-portable): commit 6010c0303a422
+
+ scp.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/scp.c b/scp.c
+index 60682c68769b..4f3fdcd3db89 100644
+--- a/scp.c
++++ b/scp.c
+@@ -1,4 +1,4 @@
+-/* $OpenBSD: scp.c,v 1.197 2018/06/01 04:31:48 dtucker Exp $ */
++/* $OpenBSD: scp.c,v 1.198 2018/11/16 03:03:10 djm Exp $ */
+ /*
+ * scp - secure remote copy. This is basically patched BSD rcp which
+ * uses ssh to do the data transfer (instead of using rcmd).
+@@ -1106,7 +1106,8 @@ sink(int argc, char **argv)
+ SCREWUP("size out of range");
+ size = (off_t)ull;
+
+- if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
++ if (*cp == '\0' || strchr(cp, '/') != NULL ||
++ strcmp(cp, ".") == 0 || strcmp(cp, "..") == 0) {
+ run_err("error: unexpected filename: %s", cp);
+ exit(1);
+ }
+--
+2.20.1
+
--
2.20.1
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