From c3829dd8825c654652201e16f8a0a0c46ee3f344 Mon Sep 17 00:00:00 2001
From: Matt Caswell <matt@openssl.org>
Date: Wed, 14 Dec 2022 16:18:14 +0000
Subject: [PATCH] Fix a UAF resulting from a bug in BIO_new_NDEF

If the aux->asn1_cb() call fails in BIO_new_NDEF then the "out" BIO will
be part of an invalid BIO chain. This causes a "use after free" when the
BIO is eventually freed.

Based on an original patch by Viktor Dukhovni and an idea from Theo
Buehler.

Thanks to Octavio Galland for reporting this issue.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
---
 crypto/asn1/bio_ndef.c | 39 ++++++++++++++++++++++++++++++++-------
 1 file changed, 32 insertions(+), 7 deletions(-)

diff --git a/crypto/asn1/bio_ndef.c b/crypto/asn1/bio_ndef.c
index 760e4846a4..f8d4b1b9aa 100644
--- a/crypto/asn1/bio_ndef.c
+++ b/crypto/asn1/bio_ndef.c
@@ -49,12 +49,19 @@ static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
                             void *parg);
 
+/*
+ * On success, the returned BIO owns the input BIO as part of its BIO chain.
+ * On failure, NULL is returned and the input BIO is owned by the caller.
+ *
+ * Unfortunately cannot constify this due to CMS_stream() and PKCS7_stream()
+ */
 BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
 {
     NDEF_SUPPORT *ndef_aux = NULL;
     BIO *asn_bio = NULL;
     const ASN1_AUX *aux = it->funcs;
     ASN1_STREAM_ARG sarg;
+    BIO *pop_bio = NULL;
 
     if (!aux || !aux->asn1_cb) {
         ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
@@ -69,21 +76,39 @@ BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
     out = BIO_push(asn_bio, out);
     if (out == NULL)
         goto err;
+    pop_bio = asn_bio;
 
-    BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
-    BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
+    if (BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free) <= 0
+            || BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free) <= 0
+            || BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux) <= 0)
+        goto err;
 
     /*
-     * Now let callback prepends any digest, cipher etc BIOs ASN1 structure
-     * needs.
+     * Now let the callback prepend any digest, cipher, etc., that the BIO's
+     * ASN1 structure needs.
      */
 
     sarg.out = out;
     sarg.ndef_bio = NULL;
     sarg.boundary = NULL;
 
-    if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
+    /*
+     * The asn1_cb(), must not have mutated asn_bio on error, leaving it in the
+     * middle of some partially built, but not returned BIO chain.
+     */
+    if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0) {
+        /*
+         * ndef_aux is now owned by asn_bio so we must not free it in the err
+         * clean up block
+         */
+        ndef_aux = NULL;
         goto err;
+    }
+
+    /*
+     * We must not fail now because the callback has prepended additional
+     * BIOs to the chain
+     */
 
     ndef_aux->val = val;
     ndef_aux->it = it;
@@ -91,11 +116,11 @@ BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
     ndef_aux->boundary = sarg.boundary;
     ndef_aux->out = out;
 
-    BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
-
     return sarg.ndef_bio;
 
  err:
+    /* BIO_pop() is NULL safe */
+    (void)BIO_pop(pop_bio);
     BIO_free(asn_bio);
     OPENSSL_free(ndef_aux);
     return NULL;
-- 
2.17.1

