187 lines
6.7 KiB
Diff
187 lines
6.7 KiB
Diff
From c3829dd8825c654652201e16f8a0a0c46ee3f344 Mon Sep 17 00:00:00 2001
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From: Matt Caswell <matt@openssl.org>
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Date: Wed, 14 Dec 2022 16:18:14 +0000
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Subject: [PATCH 4/6] Fix a UAF resulting from a bug in BIO_new_NDEF
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If the aux->asn1_cb() call fails in BIO_new_NDEF then the "out" BIO will
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be part of an invalid BIO chain. This causes a "use after free" when the
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BIO is eventually freed.
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Based on an original patch by Viktor Dukhovni and an idea from Theo
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Buehler.
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Thanks to Octavio Galland for reporting this issue.
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Reviewed-by: Paul Dale <pauli@openssl.org>
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Reviewed-by: Tomas Mraz <tomas@openssl.org>
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---
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crypto/asn1/bio_ndef.c | 39 ++++++++++++++++++++++++++++++++-------
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1 file changed, 32 insertions(+), 7 deletions(-)
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diff --git a/crypto/asn1/bio_ndef.c b/crypto/asn1/bio_ndef.c
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index 760e4846a4..f8d4b1b9aa 100644
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--- a/crypto/asn1/bio_ndef.c
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+++ b/crypto/asn1/bio_ndef.c
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@@ -49,12 +49,19 @@ static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
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void *parg);
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+/*
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+ * On success, the returned BIO owns the input BIO as part of its BIO chain.
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+ * On failure, NULL is returned and the input BIO is owned by the caller.
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+ *
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+ * Unfortunately cannot constify this due to CMS_stream() and PKCS7_stream()
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+ */
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BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
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{
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NDEF_SUPPORT *ndef_aux = NULL;
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BIO *asn_bio = NULL;
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const ASN1_AUX *aux = it->funcs;
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ASN1_STREAM_ARG sarg;
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+ BIO *pop_bio = NULL;
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if (!aux || !aux->asn1_cb) {
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ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
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@@ -69,21 +76,39 @@ BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
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out = BIO_push(asn_bio, out);
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if (out == NULL)
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goto err;
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+ pop_bio = asn_bio;
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- BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
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- BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
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+ if (BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free) <= 0
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+ || BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free) <= 0
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+ || BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux) <= 0)
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+ goto err;
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/*
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- * Now let callback prepends any digest, cipher etc BIOs ASN1 structure
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- * needs.
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+ * Now let the callback prepend any digest, cipher, etc., that the BIO's
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+ * ASN1 structure needs.
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*/
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sarg.out = out;
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sarg.ndef_bio = NULL;
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sarg.boundary = NULL;
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- if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
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+ /*
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+ * The asn1_cb(), must not have mutated asn_bio on error, leaving it in the
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+ * middle of some partially built, but not returned BIO chain.
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+ */
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+ if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0) {
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+ /*
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+ * ndef_aux is now owned by asn_bio so we must not free it in the err
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+ * clean up block
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+ */
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+ ndef_aux = NULL;
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goto err;
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+ }
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+
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+ /*
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+ * We must not fail now because the callback has prepended additional
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+ * BIOs to the chain
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+ */
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ndef_aux->val = val;
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ndef_aux->it = it;
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@@ -91,11 +116,11 @@ BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
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ndef_aux->boundary = sarg.boundary;
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ndef_aux->out = out;
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- BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
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-
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return sarg.ndef_bio;
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err:
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+ /* BIO_pop() is NULL safe */
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+ (void)BIO_pop(pop_bio);
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BIO_free(asn_bio);
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OPENSSL_free(ndef_aux);
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return NULL;
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--
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2.39.1
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From f040f2577891d2bdb7610566c172233844cf673a Mon Sep 17 00:00:00 2001
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From: Matt Caswell <matt@openssl.org>
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Date: Wed, 14 Dec 2022 17:15:18 +0000
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Subject: [PATCH 5/6] Check CMS failure during BIO setup with -stream is
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handled correctly
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Test for the issue fixed in the previous commit
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Reviewed-by: Paul Dale <pauli@openssl.org>
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Reviewed-by: Tomas Mraz <tomas@openssl.org>
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---
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test/recipes/80-test_cms.t | 15 +++++++++++++--
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test/smime-certs/badrsa.pem | 18 ++++++++++++++++++
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2 files changed, 31 insertions(+), 2 deletions(-)
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create mode 100644 test/smime-certs/badrsa.pem
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diff --git a/test/recipes/80-test_cms.t b/test/recipes/80-test_cms.t
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index 5dc6a3aebe..ec11bfc253 100644
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--- a/test/recipes/80-test_cms.t
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+++ b/test/recipes/80-test_cms.t
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@@ -13,7 +13,7 @@ use warnings;
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use POSIX;
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use File::Spec::Functions qw/catfile/;
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use File::Compare qw/compare_text/;
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-use OpenSSL::Test qw/:DEFAULT srctop_dir srctop_file/;
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+use OpenSSL::Test qw/:DEFAULT srctop_dir srctop_file with/;
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use OpenSSL::Test::Utils;
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setup("test_cms");
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@@ -27,7 +27,7 @@ my $smcont = srctop_file("test", "smcont.txt");
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my ($no_des, $no_dh, $no_dsa, $no_ec, $no_ec2m, $no_rc2, $no_zlib)
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= disabled qw/des dh dsa ec ec2m rc2 zlib/;
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-plan tests => 6;
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+plan tests => 7;
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my @smime_pkcs7_tests = (
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@@ -584,3 +584,14 @@ sub check_availability {
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return "";
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}
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+
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+# Check that we get the expected failure return code
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+with({ exit_checker => sub { return shift == 6; } },
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+ sub {
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+ ok(run(app(['openssl', 'cms', '-encrypt',
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+ '-in', srctop_file("test", "smcont.txt"),
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+ '-stream', '-recip',
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+ srctop_file("test/smime-certs", "badrsa.pem"),
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+ ])),
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+ "Check failure during BIO setup with -stream is handled correctly");
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+ });
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diff --git a/test/smime-certs/badrsa.pem b/test/smime-certs/badrsa.pem
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new file mode 100644
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index 0000000000..f824fc2267
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--- /dev/null
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+++ b/test/smime-certs/badrsa.pem
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@@ -0,0 +1,18 @@
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+-----BEGIN CERTIFICATE-----
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+MIIDbTCCAlWgAwIBAgIToTV4Z0iuK08vZP20oTh//hC8BDANBgkqhkiG9w0BAQ0FADAtMSswKQYD
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+VfcDEyJTYW1wbGUgTEFNUFMgQ2VydGlmaWNhdGUgQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoY
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+DzIwNTIwOTI3MDY1NDE4WjAZMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFjZTCCASIwDQYJKoZIhvcN
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+AQEBBQADggEPADCCAQoCggEBALT0iehYOBY+TZp/T5K2KNI05Hwr+E3wP6XTvyi6WWyTgBK9LCOw
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+I2juwdRrjFBmXkk7pWpjXwsA3A5GOtz0FpfgyC7OxsVcF7q4WHWZWleYXFKlQHJD73nQwXP968+A
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+/3rBX7PhO0DBbZnfitOLPgPEwjTtdg0VQQ6Wz+CRQ/YbHPKaw7aRphZO63dKvIKp4cQVtkWQHi6s
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+yTjGsgkLcLNau5LZDQUdsGV+SAo3nBdWCRYV+I65x8Kf4hCxqqmjV3d/2NKRu0BXnDe/N+iDz3X0
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+zEoj0fqXgq4SWcC0nsG1lyyXt1TL270I6ATKRGJWiQVCCpDtc0NT6vdJ45bCSxgCAwEAAaOBlzCB
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+lDAMBgNVHRMBAf8EAjAAMB4GA1UdEQQXMBWBE2FsaWNlQHNtaW1lLmV4YW1wbGUwEwYDVR0lBAww
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+CgYIKwYBBQUHAwQwDwYDVR0PAQH/BAUDAwfAADAdBgNVHQ4EFgQUu/bMsi0dBhIcl64papAQ0yBm
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+ZnMwHwYDVR0jBBgwFoAUeF8OWnjYa+RUcD2z3ez38fL6wEcwDQYJKoZIhvcNAQENBQADggEBABbW
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+eonR6TMTckehDKNOabwaCIcekahAIL6l9tTzUX5ew6ufiAPlC6I/zQlmUaU0iSyFDG1NW14kNbFt
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+5CAokyLhMtE4ASHBIHbiOp/ZSbUBTVYJZB61ot7w1/ol5QECSs08b8zrxIncf+t2DHGuVEy/Qq1d
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+rBz8d4ay8zpqAE1tUyL5Da6ZiKUfWwZQXSI/JlbjQFzYQqTRDnzHWrg1xPeMTO1P2/cplFaseTiv
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+yk4cYwOp/W9UAWymOZXF8WcJYCIUXkdcG/nEZxr057KlScrJmFXOoh7Y+8ON4iWYYcAfiNgpUFo/
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+j8BAwrKKaFvdlZS9k1Ypb2+UQY75mKJE9Bg=
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+-----END CERTIFICATE-----
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--
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2.39.1
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