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gnutls: fix CVE-2023-0361 timing side-channel in the TLS RSA key exchange code

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Remove branching that depends on secret data.

since the `ok` variable isn't used any more, we can remove all code
used to calculate it

(From OE-Core rev: 5b8a3601ebff7a0cdfaa50d7a0b5e384a7e2514c)

Signed-off-by: Vivek Kumbhar <vkumbhar@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Vivek Kumbhar
2023-03-08 12:14:30 +05:30
committed by Richard Purdie
parent 2a1cf26ba4
commit 3acc83f91a
2 changed files with 86 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

85
meta/recipes-support/gnutls/gnutls/CVE-2023-0361.patch Normal file
View File

@@ -0,0 +1,85 @@
From 80a6ce8ddb02477cd724cd5b2944791aaddb702a Mon Sep 17 00:00:00 2001
From: Alexander Sosedkin <asosedkin@redhat.com>
Date: Tue, 9 Aug 2022 16:05:53 +0200
Subject: [PATCH] auth/rsa: side-step potential side-channel
Signed-off-by: Alexander Sosedkin <asosedkin@redhat.com>
Signed-off-by: Hubert Kario <hkario@redhat.com>
Tested-by: Hubert Kario <hkario@redhat.com>
Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/80a6ce8ddb02477cd724cd5b2944791aaddb702a
https://gitlab.com/gnutls/gnutls/-/commit/4b7ff428291c7ed77c6d2635577c83a43bbae558]
CVE: CVE-2023-0361
Signed-off-by: Vivek Kumbhar <vkumbhar@mvista.com>
---
lib/auth/rsa.c | 30 +++---------------------------
1 file changed, 3 insertions(+), 27 deletions(-)
diff --git a/lib/auth/rsa.c b/lib/auth/rsa.c
index 8108ee8..858701f 100644
--- a/lib/auth/rsa.c
+++ b/lib/auth/rsa.c
@@ -155,13 +155,10 @@ static int
proc_rsa_client_kx(gnutls_session_t session, uint8_t * data,
size_t _data_size)
{
- const char attack_error[] = "auth_rsa: Possible PKCS #1 attack\n";
gnutls_datum_t ciphertext;
int ret, dsize;
ssize_t data_size = _data_size;
volatile uint8_t ver_maj, ver_min;
- volatile uint8_t check_ver_min;
- volatile uint32_t ok;
#ifdef ENABLE_SSL3
if (get_num_version(session) == GNUTLS_SSL3) {
@@ -187,7 +184,6 @@ proc_rsa_client_kx(gnutls_session_t session, uint8_t * data,
ver_maj = _gnutls_get_adv_version_major(session);
ver_min = _gnutls_get_adv_version_minor(session);
- check_ver_min = (session->internals.allow_wrong_pms == 0);
session->key.key.data = gnutls_malloc(GNUTLS_MASTER_SIZE);
if (session->key.key.data == NULL) {
@@ -206,10 +202,9 @@ proc_rsa_client_kx(gnutls_session_t session, uint8_t * data,
return ret;
}
- ret =
- gnutls_privkey_decrypt_data2(session->internals.selected_key,
- 0, &ciphertext, session->key.key.data,
- session->key.key.size);
+ gnutls_privkey_decrypt_data2(session->internals.selected_key,
+ 0, &ciphertext, session->key.key.data,
+ session->key.key.size);
/* After this point, any conditional on failure that cause differences
* in execution may create a timing or cache access pattern side
* channel that can be used as an oracle, so treat very carefully */
@@ -225,25 +220,6 @@ proc_rsa_client_kx(gnutls_session_t session, uint8_t * data,
* Vlastimil Klima, Ondej Pokorny and Tomas Rosa.
*/
- /* ok is 0 in case of error and 1 in case of success. */
-
- /* if ret < 0 */
- ok = CONSTCHECK_EQUAL(ret, 0);
- /* session->key.key.data[0] must equal ver_maj */
- ok &= CONSTCHECK_EQUAL(session->key.key.data[0], ver_maj);
- /* if check_ver_min then session->key.key.data[1] must equal ver_min */
- ok &= CONSTCHECK_NOT_EQUAL(check_ver_min, 0) &
- CONSTCHECK_EQUAL(session->key.key.data[1], ver_min);
-
- if (ok) {
- /* call logging function unconditionally so all branches are
- * indistinguishable for timing and cache access when debug
- * logging is disabled */
- _gnutls_no_log("%s", attack_error);
- } else {
- _gnutls_debug_log("%s", attack_error);
- }
-
/* This is here to avoid the version check attack
* discussed above.
*/
--
2.25.1

1
meta/recipes-support/gnutls/gnutls_3.6.14.bb
View File

@@ -27,6 +27,7 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar
file://CVE-2021-20232.patch \
file://CVE-2022-2509.patch \
file://CVE-2021-4209.patch \
file://CVE-2023-0361.patch \
"
SRC_URI[sha256sum] = "5630751adec7025b8ef955af4d141d00d252a985769f51b4059e5affa3d39d63"