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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)
---
.../implementations/ciphers/cipher_aes_siv.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/providers/implementations/ciphers/cipher_aes_siv.c b/providers/implementations/ciphers/cipher_aes_siv.c
index 45010b90db2a..b396c8651a32 100644
--- 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)
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