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Avoid type errors in EAI-related name check logic.
The incorrectly typed data is read only, used in a compare operation, so neither remote code execution, nor memory content disclosure were possible. However, applications performing certificate name checks were vulnerable to denial of service. The GENERAL_TYPE data type is a union, and we must take care to access the correct member, based on `gen->type`, not all the member fields have the same structure, and a segfault is possible if the wrong member field is read. The code in question was lightly refactored with the intent to make it more obviously correct. CVE-2024-6119 (cherry picked from commit 1486960d6cdb052e4fc0109a56a0597b4e902ba1)
This commit is contained in:
Viktor Dukhovni
Gordon Tetlow
parent
1070e7dca8
commit
e60dbfd00b
@ -916,36 +916,64 @@ static int do_x509_check(X509 *x, const char *chk, size_t chklen,
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ASN1_STRING *cstr;
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gen = sk_GENERAL_NAME_value(gens, i);
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if ((gen->type == GEN_OTHERNAME) && (check_type == GEN_EMAIL)) {
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if (OBJ_obj2nid(gen->d.otherName->type_id) ==
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NID_id_on_SmtpUTF8Mailbox) {
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san_present = 1;
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/*
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* If it is not a UTF8String then that is unexpected and we
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* treat it as no match
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switch (gen->type) {
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default:
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continue;
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case GEN_OTHERNAME:
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switch (OBJ_obj2nid(gen->d.otherName->type_id)) {
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default:
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continue;
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case NID_id_on_SmtpUTF8Mailbox:
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/*-
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* https://datatracker.ietf.org/doc/html/rfc8398#section-3
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*
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* Due to name constraint compatibility reasons described
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* in Section 6, SmtpUTF8Mailbox subjectAltName MUST NOT
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* be used unless the local-part of the email address
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* contains non-ASCII characters. When the local-part is
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* ASCII, rfc822Name subjectAltName MUST be used instead
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* of SmtpUTF8Mailbox. This is compatible with legacy
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* software that supports only rfc822Name (and not
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* SmtpUTF8Mailbox). [...]
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*
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* SmtpUTF8Mailbox is encoded as UTF8String.
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*
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* If it is not a UTF8String then that is unexpected, and
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* we ignore the invalid SAN (neither set san_present nor
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* consider it a candidate for equality). This does mean
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* that the subject CN may be considered, as would be the
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* case when the malformed SmtpUtf8Mailbox SAN is instead
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* simply absent.
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*
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* When CN-ID matching is not desirable, applications can
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* choose to turn it off, doing so is at this time a best
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* practice.
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*/
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if (gen->d.otherName->value->type == V_ASN1_UTF8STRING) {
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cstr = gen->d.otherName->value->value.utf8string;
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/* Positive on success, negative on error! */
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if ((rv = do_check_string(cstr, 0, equal, flags,
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chk, chklen, peername)) != 0)
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break;
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}
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} else
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if (check_type != GEN_EMAIL
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|| gen->d.otherName->value->type != V_ASN1_UTF8STRING)
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continue;
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alt_type = 0;
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cstr = gen->d.otherName->value->value.utf8string;
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break;
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}
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break;
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case GEN_EMAIL:
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if (check_type != GEN_EMAIL)
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continue;
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} else {
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if ((gen->type != check_type) && (gen->type != GEN_OTHERNAME))
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cstr = gen->d.rfc822Name;
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break;
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case GEN_DNS:
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if (check_type != GEN_DNS)
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continue;
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cstr = gen->d.dNSName;
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break;
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case GEN_IPADD:
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if (check_type != GEN_IPADD)
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continue;
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cstr = gen->d.iPAddress;
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break;
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}
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san_present = 1;
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if (check_type == GEN_EMAIL)
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cstr = gen->d.rfc822Name;
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else if (check_type == GEN_DNS)
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cstr = gen->d.dNSName;
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else
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cstr = gen->d.iPAddress;
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/* Positive on success, negative on error! */
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if ((rv = do_check_string(cstr, alt_type, equal, flags,
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chk, chklen, peername)) != 0)
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@ -21,16 +21,18 @@ setup("test_eai_data");
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#./util/wrap.pl apps/openssl verify -nameopt utf8 -no_check_time -CAfile test/recipes/25-test_eai_data/utf8_chain.pem test/recipes/25-test_eai_data/ascii_leaf.pem
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#./util/wrap.pl apps/openssl verify -nameopt utf8 -no_check_time -CAfile test/recipes/25-test_eai_data/ascii_chain.pem test/recipes/25-test_eai_data/utf8_leaf.pem
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plan tests => 12;
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plan tests => 16;
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require_ok(srctop_file('test','recipes','tconversion.pl'));
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my $folder = "test/recipes/25-test_eai_data";
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my $ascii_pem = srctop_file($folder, "ascii_leaf.pem");
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my $utf8_pem = srctop_file($folder, "utf8_leaf.pem");
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my $kdc_pem = srctop_file($folder, "kdc-cert.pem");
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my $ascii_chain_pem = srctop_file($folder, "ascii_chain.pem");
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my $utf8_chain_pem = srctop_file($folder, "utf8_chain.pem");
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my $kdc_chain_pem = srctop_file($folder, "kdc-root-cert.pem");
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my $out;
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my $outcnt = 0;
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@ -56,10 +58,18 @@ SKIP: {
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ok(run(app(["openssl", "verify", "-nameopt", "utf8", "-no_check_time", "-CAfile", $ascii_chain_pem, $ascii_pem])));
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ok(run(app(["openssl", "verify", "-nameopt", "utf8", "-no_check_time", "-CAfile", $utf8_chain_pem, $utf8_pem])));
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ok(run(app(["openssl", "verify", "-nameopt", "utf8", "-no_check_time", "-CAfile", $kdc_chain_pem, $kdc_pem])));
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ok(!run(app(["openssl", "verify", "-nameopt", "utf8", "-no_check_time", "-CAfile", $ascii_chain_pem, $utf8_pem])));
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ok(!run(app(["openssl", "verify", "-nameopt", "utf8", "-no_check_time", "-CAfile", $utf8_chain_pem, $ascii_pem])));
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# Check an otherName does not get misparsed as an DNS name, (should trigger ASAN errors if violated).
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ok(run(app(["openssl", "verify", "-nameopt", "utf8", "-no_check_time", "-verify_hostname", 'mx1.example.com', "-CAfile", $kdc_chain_pem, $kdc_pem])));
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# Check an otherName does not get misparsed as an email address, (should trigger ASAN errors if violated).
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ok(run(app(["openssl", "verify", "-nameopt", "utf8", "-no_check_time", "-verify_email", 'joe@example.com', "-CAfile", $kdc_chain_pem, $kdc_pem])));
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# We expect SmtpUTF8Mailbox to be a UTF8 String, not an IA5String.
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ok(!run(app(["openssl", "verify", "-nameopt", "utf8", "-no_check_time", "-verify_email", 'moe@example.com', "-CAfile", $kdc_chain_pem, $kdc_pem])));
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#Check that we get the expected failure return code
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with({ exit_checker => sub { return shift == 2; } },
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sub {
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21
test/recipes/25-test_eai_data/kdc-cert.pem
Normal file
21
test/recipes/25-test_eai_data/kdc-cert.pem
Normal file
@ -0,0 +1,21 @@
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-----BEGIN CERTIFICATE-----
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MIIDbDCCAlSgAwIBAgIBAjANBgkqhkiG9w0BAQsFADAPMQ0wCwYDVQQDDARSb290
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MCAXDTI0MDYyMDA2MTQxNVoYDzIxMjQwNjIwMDYxNDE1WjAXMRUwEwYDVQQDDAxU
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RVNULkVYQU1QTEUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC6wfP+
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6go79dkpo/dGLMlPZ7Gw/Q6gUYrCWZWUEgEeRVHCrqOlgUEyA+PcWas/XDPUxXry
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BQlJHLvlqamAQn8gs4QPBARFYWKNiTVGyaRkgNA1N5gqyZdrP9UE+ZJmdqxRAAe8
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vvpGZWSgevPhLUiSCFYDiD0Rtji2Hm3rGUrReQFBQDEw2pNGwz9zIaxUs08kQZcx
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Yzyiplz5Oau+R/6sAgUwDlrD9xOlUxx/tA/MSDIfkK8qioU11uUZtO5VjkNQy/bT
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7zQMmXxWgm2MIgOs1u4YN7YGOtgqHE9v9iPHHfgrkbQDtVDGQsa8AQEhkUDSCtW9
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3VFAKx6dGNXYzFwfAgMBAAGjgcgwgcUwHQYDVR0OBBYEFFR5tZycW19DmtbL4Zqj
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te1c2vZLMAkGA1UdIwQCMAAwCQYDVR0TBAIwADCBjQYDVR0RBIGFMIGCoD8GBisG
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AQUCAqA1MDOgDhsMVEVTVC5FWEFNUExFoSEwH6ADAgEBoRgwFhsGa3JidGd0GwxU
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RVNULkVYQU1QTEWgHQYIKwYBBQUHCAmgERYPbW9lQGV4YW1wbGUuY29tgQ9qb2VA
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ZXhhbXBsZS5jb22CD214MS5leGFtcGxlLmNvbTANBgkqhkiG9w0BAQsFAAOCAQEA
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T0xzVtVpRtaOzIhgzw7XQUdzWD5UEGSJJ1cBCOmKUWwDLTAouCYLFB4TbEE7MMUb
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iuMy60bjmVtvfJIXorGUgSadRe5RWJ5DamJWvPA0Q9x7blnEcXqEF+9Td+ypevgU
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UYHFmg83OYwxOsFXZ5cRuXMk3WCsDHQIBi6D1L6oDDZ2pfArs5mqm3thQKVlqyl1
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El3XRYEdqAz/5eCOFNfwxF0ALxjxVr/Z50StUZU8I7Zfev6+kHhyrR7dqzYJImv9
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0fTCOBEMjIETDsrA70OxAMu4V16nrWZdJdvzblS2qrt97Omkj+2kiPAJFB76RpwI
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oDQ9fKfUOAmUFth2/R/eGA==
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-----END CERTIFICATE-----
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16
test/recipes/25-test_eai_data/kdc-root-cert.pem
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16
test/recipes/25-test_eai_data/kdc-root-cert.pem
Normal file
@ -0,0 +1,16 @@
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-----BEGIN CERTIFICATE-----
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MIICnDCCAYQCCQCBswYcrlZSHjANBgkqhkiG9w0BAQsFADAPMQ0wCwYDVQQDDARS
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b290MCAXDTI0MDYyMDA2MTQxNVoYDzIxMjQwNjIwMDYxNDE1WjAPMQ0wCwYDVQQD
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DARSb290MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqRj8S4kBbIUj
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61kZfi6nE35Q38U140+qt4uAiwAhKumfVHlBM0zQ98WFt5zMHIBQwIb3yjc2zj+0
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qzUnQfwm1r/RfcMmBPEti9Ge+aEMSsds2gMXziOFM8wd2aAFPy7UVE0XpEWofsRK
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MGi61MKVdPSbGIxBwY9VW38/7D/wf1HtJe7y0xpuecR7GB2XAs+qST59NjuF+7wS
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dLM8Hb3TATgeYbXXWsRJgwz+SPzExg5WmLnU+7y4brZ32dHtdSmkRVSgSlaIf7Xj
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3Tc6Zi7I+W/JYk7hy1zUexVdWCak4PHcoWrXe0gNNN/t8VfLfMExt5z/HIylXnU7
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pGUyqZlTGQIDAQABMA0GCSqGSIb3DQEBCwUAA4IBAQAHpLF1UCRy7b6Hk0rLokxI
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lgwiH9BU9mktigAGASvkbllpt+YbUbWnuYAvpHBGiP1qZtfX2r96UrSJaGO9BEzT
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Gp9ThnSjoj4Srul0+s/NArU22irFLmDzbalgevAmm9gMGkdqkiIm/mXbwrPj0ncl
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KGicevXryVpvaP62eZ8cc3C4p97frMmXxRX8sTdQpD/gRI7prdEILRSKveqT+AEW
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7rFGM5AOevb4U8ddop8A3D/kX0wcCAIBF6jCNk3uEJ57jVcagL04kPnVfdRiedTS
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vfq1DRNcD29d1H/9u0fHdSn1/+8Ep3X+afQ3C6//5NvOEaXcIGO4QSwkprQydfv8
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-----END CERTIFICATE-----
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41
test/recipes/25-test_eai_data/kdc.sh
Executable file
41
test/recipes/25-test_eai_data/kdc.sh
Executable file
@ -0,0 +1,41 @@
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#! /usr/bin/env bash
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# Create a root CA, signing a leaf cert with a KDC principal otherName SAN, and
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# also a non-UTF8 smtpUtf8Mailbox SAN followed by an rfc822Name SAN and a DNS
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# name SAN. In the vulnerable EAI code, the KDC principal `otherName` should
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# trigger ASAN errors in DNS name checks, while the non-UTF8 `smtpUtf8Mailbox`
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# should likewise lead to ASAN issues with email name checks.
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rm -f root-key.pem root-cert.pem
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openssl req -nodes -new -newkey rsa:2048 -keyout kdc-root-key.pem \
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-x509 -subj /CN=Root -days 36524 -out kdc-root-cert.pem
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exts=$(
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printf "%s\n%s\n%s\n%s = " \
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"subjectKeyIdentifier = hash" \
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"authorityKeyIdentifier = keyid" \
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"basicConstraints = CA:false" \
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"subjectAltName"
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printf "%s, " "otherName:1.3.6.1.5.2.2;SEQUENCE:kdc_princ_name"
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printf "%s, " "otherName:1.3.6.1.5.5.7.8.9;IA5:moe@example.com"
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printf "%s, " "email:joe@example.com"
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printf "%s\n" "DNS:mx1.example.com"
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printf "[kdc_princ_name]\n"
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printf "realm = EXP:0, GeneralString:TEST.EXAMPLE\n"
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printf "principal_name = EXP:1, SEQUENCE:kdc_principal_seq\n"
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printf "[kdc_principal_seq]\n"
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printf "name_type = EXP:0, INTEGER:1\n"
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printf "name_string = EXP:1, SEQUENCE:kdc_principal_components\n"
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printf "[kdc_principal_components]\n"
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printf "princ1 = GeneralString:krbtgt\n"
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printf "princ2 = GeneralString:TEST.EXAMPLE\n"
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)
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printf "%s\n" "$exts"
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openssl req -nodes -new -newkey rsa:2048 -keyout kdc-key.pem \
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-subj "/CN=TEST.EXAMPLE" |
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openssl x509 -req -out kdc-cert.pem \
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-CA "kdc-root-cert.pem" -CAkey "kdc-root-key.pem" \
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-set_serial 2 -days 36524 \
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-extfile <(printf "%s\n" "$exts")
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