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dropbear: patch CVE-2019-6111

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(From OE-Core rev: 8fa0c278c269ed1ef0225cf22a86d0b36632058e)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Paul Barker <paul@pbarker.dev>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Peter Marko
2026-01-01 15:16:02 +01:00
committed by Richard Purdie
parent 6b53fa118e
commit 38071ff688
2 changed files with 158 additions and 0 deletions
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157
meta/recipes-core/dropbear/dropbear/CVE-2019-6111.patch Normal file
View File

@@ -0,0 +1,157 @@
From 48a17cff6aa104b8e806ddb2191f83f1024060f1 Mon Sep 17 00:00:00 2001
From: Matt Johnston <matt@ucc.asn.au>
Date: Tue, 9 Dec 2025 22:59:19 +0900
Subject: [PATCH] scp CVE-2019-6111 fix
Cherry-pick from OpenSSH portable
391ffc4b9d31 ("upstream: check in scp client that filenames sent during")
upstream: check in scp client that filenames sent during
remote->local directory copies satisfy the wildcard specified by the user.
This checking provides some protection against a malicious server
sending unexpected filenames, but it comes at a risk of rejecting wanted
files due to differences between client and server wildcard expansion rules.
For this reason, this also adds a new -T flag to disable the check.
reported by Harry Sintonen
fix approach suggested by markus@;
has been in snaps for ~1wk courtesy deraadt@
CVE: CVE-2019-6111
Upstream-Status: Backport [https://github.com/mkj/dropbear/commit/48a17cff6aa104b8e806ddb2191f83f1024060f1]
Signed-off-by: Peter Marko <peter.marko@siemens.com>
---
scp.c | 38 +++++++++++++++++++++++++++++---------
1 file changed, 29 insertions(+), 9 deletions(-)
diff --git a/scp.c b/scp.c
index 384f2cb..bf98986 100644
--- a/scp.c
+++ b/scp.c
@@ -76,6 +76,8 @@
#include "includes.h"
/*RCSID("$OpenBSD: scp.c,v 1.130 2006/01/31 10:35:43 djm Exp $");*/
+#include <fnmatch.h>
+
#include "atomicio.h"
#include "compat.h"
#include "scpmisc.h"
@@ -291,14 +293,14 @@ void verifydir(char *);
uid_t userid;
int errs, remin, remout;
-int pflag, iamremote, iamrecursive, targetshouldbedirectory;
+int Tflag, pflag, iamremote, iamrecursive, targetshouldbedirectory;
#define CMDNEEDS 64
char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */
int response(void);
void rsource(char *, struct stat *);
-void sink(int, char *[]);
+void sink(int, char *[], const char *);
void source(int, char *[]);
void tolocal(int, char *[]);
void toremote(char *, int, char *[]);
@@ -325,8 +327,8 @@ main(int argc, char **argv)
args.list = NULL;
addargs(&args, "%s", ssh_program);
- fflag = tflag = 0;
- while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
+ fflag = Tflag = tflag = 0;
+ while ((ch = getopt(argc, argv, "dfl:prtTvBCc:i:P:q1246S:o:F:")) != -1)
switch (ch) {
/* User-visible flags. */
case '1':
@@ -389,9 +391,12 @@ main(int argc, char **argv)
setmode(0, O_BINARY);
#endif
break;
+ case 'T':
+ Tflag = 1;
+ break;
default:
usage();
- }
+ }
argc -= optind;
argv += optind;
@@ -409,7 +414,7 @@ main(int argc, char **argv)
}
if (tflag) {
/* Receive data. */
- sink(argc, argv);
+ sink(argc, argv, NULL);
exit(errs != 0);
}
if (argc < 2)
@@ -589,7 +594,7 @@ tolocal(int argc, char **argv)
continue;
}
xfree(bp);
- sink(1, argv + argc - 1);
+ sink(1, argv + argc - 1, src);
(void) close(remin);
remin = remout = -1;
}
@@ -822,7 +827,7 @@ bwlimit(int amount)
}
void
-sink(int argc, char **argv)
+sink(int argc, char **argv, const char *src)
{
static BUF buffer;
struct stat stb;
@@ -836,6 +841,7 @@ sink(int argc, char **argv)
off_t size, statbytes;
int setimes, targisdir, wrerrno = 0;
char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
+ char *src_copy = NULL, *restrict_pattern = NULL;
struct timeval tv[2];
#define atime tv[0]
@@ -857,6 +863,17 @@ sink(int argc, char **argv)
(void) atomicio(vwrite, remout, "", 1);
if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
targisdir = 1;
+ if (src != NULL && !iamrecursive && !Tflag) {
+ /*
+ * Prepare to try to restrict incoming filenames to match
+ * the requested destination file glob.
+ */
+ if ((src_copy = strdup(src)) == NULL)
+ fatal("strdup failed");
+ if ((restrict_pattern = strrchr(src_copy, '/')) != NULL) {
+ *restrict_pattern++ = '\0';
+ }
+ }
for (first = 1;; first = 0) {
cp = buf;
if (atomicio(read, remin, cp, 1) != 1)
@@ -939,6 +956,9 @@ sink(int argc, char **argv)
run_err("error: unexpected filename: %s", cp);
exit(1);
}
+ if (restrict_pattern != NULL &&
+ fnmatch(restrict_pattern, cp, 0) != 0)
+ SCREWUP("filename does not match request");
if (targisdir) {
static char *namebuf = NULL;
static size_t cursize = 0;
@@ -977,7 +997,7 @@ sink(int argc, char **argv)
goto bad;
}
vect[0] = xstrdup(np);
- sink(1, vect);
+ sink(1, vect, src);
if (setimes) {
setimes = 0;
if (utimes(vect[0], tv) < 0)

1
meta/recipes-core/dropbear/dropbear_2022.83.bb
View File

@@ -29,6 +29,7 @@ SRC_URI = "http://matt.ucc.asn.au/dropbear/releases/dropbear-${PV}.tar.bz2 \
file://0001-cli-runopts.c-add-missing-DROPBEAR_CLI_PUBKEY_AUTH.patch \
file://0001-Avoid-unused-variable-with-DROPBEAR_CLI_PUBKEY_AUTH-.patch \
file://CVE-2025-47203.patch \
file://CVE-2019-6111.patch \
"
SRC_URI[sha256sum] = "bc5a121ffbc94b5171ad5ebe01be42746d50aa797c9549a4639894a16749443b"