https://github.com/openssl/openssl/commit/6a83f0c958811f07e0d11dfc6b5a6a98edfd5bdc
https://github.com/openssl/openssl/commit/76214c4a8f3374b786811fdfeda3d98690f8faf4

From 6a83f0c958811f07e0d11dfc6b5a6a98edfd5bdc Mon Sep 17 00:00:00 2001
From: Tomas Mraz <tomas@openssl.org>
Date: Tue, 4 Jul 2023 17:30:35 +0200
Subject: [PATCH] Do not ignore empty associated data with AES-SIV mode

The AES-SIV mode allows for multiple associated data items
authenticated separately with any of these being 0 length.

The provided implementation ignores such empty associated data
which is incorrect in regards to the RFC 5297 and is also
a security issue because such empty associated data then become
unauthenticated if an application expects to authenticate them.

Fixes CVE-2023-2975

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21384)

(cherry picked from commit c426c281cfc23ab182f7d7d7a35229e7db1494d9)
--- a/providers/implementations/ciphers/cipher_aes_siv.c
+++ b/providers/implementations/ciphers/cipher_aes_siv.c
@@ -120,14 +120,18 @@ static int siv_cipher(void *vctx, unsigned char *out, size_t *outl,
     if (!ossl_prov_is_running())
         return 0;
 
-    if (inl == 0) {
-        *outl = 0;
-        return 1;
-    }
+    /* Ignore just empty encryption/decryption call and not AAD. */
+    if (out != NULL) {
+        if (inl == 0) {
+            if (outl != NULL)
+                *outl = 0;
+            return 1;
+        }
 
-    if (outsize < inl) {
-        ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
-        return 0;
+        if (outsize < inl) {
+            ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
+            return 0;
+        }
     }
 
     if (ctx->hw->cipher(ctx, out, in, inl) <= 0)

From 76214c4a8f3374b786811fdfeda3d98690f8faf4 Mon Sep 17 00:00:00 2001
From: Tomas Mraz <tomas@openssl.org>
Date: Tue, 4 Jul 2023 17:50:37 +0200
Subject: [PATCH] Add testcases for empty associated data entries with AES-SIV

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21384)

(cherry picked from commit 3993bb0c0c87e3ed0ab4274e4688aa814e164cfc)
--- a/test/recipes/30-test_evp_data/evpciph_aes_siv.txt
+++ b/test/recipes/30-test_evp_data/evpciph_aes_siv.txt
@@ -20,6 +20,19 @@ Tag = 85632d07c6e8f37f950acd320a2ecc93
 Plaintext =  112233445566778899aabbccddee
 Ciphertext = 40c02b9690c4dc04daef7f6afe5c
 
+Cipher = aes-128-siv
+Key = fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
+Tag = f1c5fdeac1f15a26779c1501f9fb7588
+Plaintext =  112233445566778899aabbccddee
+Ciphertext = 27e946c669088ab06da58c5c831c
+
+Cipher = aes-128-siv
+Key = fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
+AAD =
+Tag = d1022f5b3664e5a4dfaf90f85be6f28a
+Plaintext =  112233445566778899aabbccddee
+Ciphertext = b66cff6b8eca0b79f083b39a0901
+
 Cipher = aes-128-siv
 Key = 7f7e7d7c7b7a79787776757473727170404142434445464748494a4b4c4d4e4f
 AAD = 00112233445566778899aabbccddeeffdeaddadadeaddadaffeeddccbbaa99887766554433221100
@@ -29,6 +42,24 @@ Tag = 7bdb6e3b432667eb06f4d14bff2fbd0f
 Plaintext =  7468697320697320736f6d6520706c61696e7465787420746f20656e6372797074207573696e67205349562d414553
 Ciphertext = cb900f2fddbe404326601965c889bf17dba77ceb094fa663b7a3f748ba8af829ea64ad544a272e9c485b62a3fd5c0d
 
+Cipher = aes-128-siv
+Key = 7f7e7d7c7b7a79787776757473727170404142434445464748494a4b4c4d4e4f
+AAD = 00112233445566778899aabbccddeeffdeaddadadeaddadaffeeddccbbaa99887766554433221100
+AAD =
+AAD = 09f911029d74e35bd84156c5635688c0
+Tag = 83ce6593a8fa67eb6fcd2819cedfc011
+Plaintext =  7468697320697320736f6d6520706c61696e7465787420746f20656e6372797074207573696e67205349562d414553
+Ciphertext = 30d937b42f71f71f93fc2d8d702d3eac8dc7651eefcd81120081ff29d626f97f3de17f2969b691c91b69b652bf3a6d
+
+Cipher = aes-128-siv
+Key = 7f7e7d7c7b7a79787776757473727170404142434445464748494a4b4c4d4e4f
+AAD =
+AAD = 00112233445566778899aabbccddeeffdeaddadadeaddadaffeeddccbbaa99887766554433221100
+AAD = 09f911029d74e35bd84156c5635688c0
+Tag = 77dd4a44f5a6b41302121ee7f378de25
+Plaintext =  7468697320697320736f6d6520706c61696e7465787420746f20656e6372797074207573696e67205349562d414553
+Ciphertext = 0fcd664c922464c88939d71fad7aefb864e501b0848a07d39201c1067a7288f3dadf0131a823a0bc3d588e8564a5fe
+
 Cipher = aes-192-siv
 Key = fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0f0f1f2f3f4f5f6f7f8f9fafbfcfdfefffffefdfcfbfaf9f8f7f6f5f4f3f2f1f0
 AAD = 101112131415161718191a1b1c1d1e1f2021222324252627

