strongswan: Fix for CVE-2021-41990 and CVE-2021-41991

Add patch to fix CVE-2021-41990 and CVE-2021-41991

Signed-off-by: virendra thakur <thakur.virendra1810@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-networking/recipes-support/strongswan/files/CVE-2021-41990.patch

@@ -0,0 +1,62 @@
+From 423a5d56274a1d343e0d2107dfc4fbf0df2dcca5 Mon Sep 17 00:00:00 2001
+From: Tobias Brunner <tobias@strongswan.org>
+Date: Tue, 28 Sep 2021 17:52:08 +0200
+Subject: [PATCH] Reject RSASSA-PSS params with negative salt length
+
+The `salt_len` member in the struct is of type `ssize_t` because we use
+negative values for special automatic salt lengths when generating
+signatures.
+
+Not checking this could lead to an integer overflow.  The value is assigned
+to the `len` field of a chunk (`size_t`), which is further used in
+calculations to check the padding structure and (if that is passed by a
+matching crafted signature value) eventually a memcpy() that will result
+in a segmentation fault.
+
+Fixes: a22316520b91 ("signature-params: Add functions to parse/build ASN.1 RSASSA-PSS params")
+Fixes: 7d6b81648b2d ("gmp: Add support for RSASSA-PSS signature verification")
+Fixes: CVE-2021-41990
+
+Upstream-Status: Backport [https://download.strongswan.org/security/CVE-2021-41990]
+CVE: CVE-2021-41990
+
+Signed-off-by: Virendra Thakur <virendra.thakur@kpit.com>
+
+---
+ src/libstrongswan/credentials/keys/signature_params.c | 6 +++++-
+ src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c    | 2 +-
+ 2 files changed, 6 insertions(+), 2 deletions(-)
+
+diff --git a/src/libstrongswan/credentials/keys/signature_params.c b/src/libstrongswan/credentials/keys/signature_params.c
+index d89bd2c96bb5..837de8443d43 100644
+--- a/src/libstrongswan/credentials/keys/signature_params.c
++++ b/src/libstrongswan/credentials/keys/signature_params.c
+@@ -322,7 +322,11 @@ bool rsa_pss_params_parse(chunk_t asn1, int level0, rsa_pss_params_t *params)
+ 			case RSASSA_PSS_PARAMS_SALT_LEN:
+ 				if (object.len)
+ 				{
+-					params->salt_len = (size_t)asn1_parse_integer_uint64(object);
++					params->salt_len = (ssize_t)asn1_parse_integer_uint64(object);
++					if (params->salt_len < 0)
++					{
++						goto end;
++					}
+ 				}
+ 				break;
+ 			case RSASSA_PSS_PARAMS_TRAILER:
+diff --git a/src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c b/src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c
+index f9bd1d314dec..3a775090883e 100644
+--- a/src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c
++++ b/src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c
+@@ -168,7 +168,7 @@ static bool verify_emsa_pss_signature(private_gmp_rsa_public_key_t *this,
+ 	int i;
+ 	bool success = FALSE;
+ 
+-	if (!params)
++	if (!params || params->salt_len < 0)
+ 	{
+ 		return FALSE;
+ 	}
+-- 
+2.25.1
+

meta-networking/recipes-support/strongswan/files/CVE-2021-41991.patch

@@ -0,0 +1,41 @@
+From b667237b3a84f601ef5a707ce8eb861c3a5002d3 Mon Sep 17 00:00:00 2001
+From: Tobias Brunner <tobias@strongswan.org>
+Date: Tue, 28 Sep 2021 19:38:22 +0200
+Subject: [PATCH] cert-cache: Prevent crash due to integer overflow/sign change
+
+random() allocates values in the range [0, RAND_MAX], with RAND_MAX usually
+equaling INT_MAX = 2^31-1.  Previously, values between 0 and 31 were added
+directly to that offset before applying`% CACHE_SIZE` to get an index into
+the cache array.  If the random value was very high, this resulted in an
+integer overflow and a negative index value and, therefore, an out-of-bounds
+access of the array and in turn dereferencing invalid pointers when trying
+to acquire the read lock.  This most likely results in a segmentation fault.
+
+Fixes: 764e8b2211ce ("reimplemented certificate cache")
+Fixes: CVE-2021-41991
+
+Upstream-Status: Backport [https://download.strongswan.org/security/CVE-2021-41991]
+CVE: CVE-2021-41991
+
+Signed-off-by: Virendra Thakur <virendra.thakur@kpit.com>
+
+---
+ src/libstrongswan/credentials/sets/cert_cache.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/libstrongswan/credentials/sets/cert_cache.c b/src/libstrongswan/credentials/sets/cert_cache.c
+index f1579c60a9bc..ceebb3843725 100644
+--- a/src/libstrongswan/credentials/sets/cert_cache.c
++++ b/src/libstrongswan/credentials/sets/cert_cache.c
+@@ -151,7 +151,7 @@ static void cache(private_cert_cache_t *this,
+ 	for (try = 0; try < REPLACE_TRIES; try++)
+ 	{
+ 		/* replace a random relation */
+-		offset = random();
++		offset = random() % CACHE_SIZE;
+ 		for (i = 0; i < CACHE_SIZE; i++)
+ 		{
+ 			rel = &this->relations[(i + offset) % CACHE_SIZE];
+-- 
+2.25.1
+

meta-networking/recipes-support/strongswan/strongswan_5.8.4.bb

@@ -11,6 +11,8 @@ SRC_URI = "http://download.strongswan.org/strongswan-${PV}.tar.bz2 \
            file://fix-funtion-parameter.patch \
            file://0001-memory.h-Include-stdint.h-for-uintptr_t.patch \
            file://0001-Remove-obsolete-setting-regarding-the-Standard-Outpu.patch \
+           file://CVE-2021-41990.patch \
+           file://CVE-2021-41991.patch \
            "
 
 SRC_URI[md5sum] = "0634e7f40591bd3f6770e583c3f27d29"