October 17, 2017
The full version string for this update release is 1.8.0_151-b12 (where "b" means "build"). The version number is 8u151.
JDK 8u151 contains IANA time zone data version 2017b. For more information, refer to Timezone Data Versions in the JRE Software.
The security baselines for the Java Runtime Environment (JRE) at the time of the release of JDK 8u151 are specified in the following table:
|JRE Family Version||JRE Security Baseline |
(Full Version String)
The JRE expires whenever a new release with security vulnerability fixes becomes available. Critical patch updates, which contain security vulnerability fixes, are announced one year in advance on Critical Patch Updates, Security Alerts and Third Party Bulletin. This JRE (version 8u151) will expire with the release of the next critical patch update scheduled for January 16, 2018.
For systems unable to reach the Oracle Servers, a secondary mechanism expires this JRE (version 8u151) on February 16, 2018. After either condition is met (new release becoming available or expiration date reached), the JRE will provide additional warnings and reminders to users to update to the newer version. For more information, see JRE Expiration Date.
The zlib version shipped in the 8u151 and 7u161 JDK releases was updated to zlib v1.2.11. The deflate functionality in this version causes a compatibility issue with Tomcat v7.x. Server responses can appear as corrupt or can fail to be decoded. The issue is seen if Tomcat is using compression (e.g. compression="on" in server.xml). This issue is being fixed via JDK-8189789.
Users can disable the compression mode on their Tomcat servers as a workaround. Tomcat versions 8.x and later don't appear to be affected.
Due to the more rigorous procedure of reading a keystore content, some keystores (particularly, those created with old versions of the JDK or with a JDK from other vendors) might need to be regenerated.
The following procedure can be used to import the keystore:
1. Before you start, create a backup of your keystore. For example, if your keystore file is
/DIR/KEYSTORE, make a copy of it:
cp /DIR/KEYSTORE /DIR/KEYSTORE.BK
Download an older release of the JDK, prior CPU17_04, and install it in a separate location. For example: 6u161, 7u151, or 8u141. Suppose, that older JDK is installed in the directory
2. Make sure that the keystore can be successfully read with the keytool from that older directory. For example, if the keystore file is located in
/DIR/KEYSTORE, the following command should successfully list its content:
/JDK8U141/bin/keytool -list /DIR/KEYSTORE
3. Import the keystore. For example:
/JDK8U141/bin/keytool -importkeystore \
-srckeystore /DIR/KEYSTORE \
-srcstoretype JCEKS \
-srcstorepass PASSWORD \
-destkeystore /DIR/KEYSTORE.NEW \
-deststoretype JCEKS \
4. Verify that the newly created keystore is correct. At the very least, make sure that the keystore can be read with keytool from a newer JDK:
/NEW_JDK/bin/keytool -list /DIR/KEYSTORE.NEW
After successful verification, replace the old keystore with the new one:
mv /DIR/KEYSTORE.NEW /DIR/KEYSTORE
Keep the backup copy of the keystore at least until you are sure the imported keystore is correct.
Timeouts used by the FTP URL protocol handler have been changed from infinite to 5 minutes. This will result in an IOException from connect and read operations if the FTP server is unresponsive. For example,
new URL("ftp://example.com").openStream().read(), will fail with
java.net.SocketTimeoutException in case a connection or reading could not be completed within 5 minutes.
To revert this behaviour to that of previous releases, the following system properties may be used,
Demos were removed from package tar.Z bundle(JDK-7066713). There is a separate Demos&Samples bundle beginning with 7u2 b08 and 6u32 b04, but Solaris patches still contain SUNWj7dmo/SUNWj6dmo. The 64 bit packages are SUNWj7dmx/SUNWj6dmx
Demo packages remain in the existing Solaris patches; however, just because they are there doesn't mean that they are installed. They will be patched only if the end user has them installed on the system.
The link above is to the Solaris OS Install Directions for the JDK. The SUNWj7dmx package is mentioned in the tar.Z portion of the directions. This is confusing to some as, according to the cited bug, the SUNWj7dmx package shouldn't be part of the tar.Z bundle.
One Swisscom root certificate has been revoked by Swisscom and has been removed:
Swisscom Root EV CA 2
alias: "swisscomrootevca2 [jdk]"
DN: CN=Swisscom Root EV CA 2, OU=Digital Certificate Services, O=Swisscom, C=ch
This release introduces a new feature whereby the JCE jurisdiction policy files used by the JDK can be controlled via a new Security property. In older releases, JCE jurisdiction files had to be downloaded and installed separately to allow unlimited cryptography to be used by the JDK. The download and install steps are no longer necessary. To enable unlimited cryptography, one can use the new
crypto.policy Security property. If the new Security property (crypto.policy) is set in the java.security file, or has been set dynamically by using the Security.setProperty() call before the JCE framework has been initialized, that setting will be honored. By default, the property will be undefined. If the property is undefined and the legacy JCE jurisdiction files don't exist in the legacy lib/security directory, then the default cryptographic level will remain at 'limited'. To configure the JDK to use unlimited cryptography, set the crypto.policy to a value of 'unlimited'. See the notes in the java.security file shipping with this release for more information.
Note: On Solaris, it's recommended that you remove the old SVR4 packages before installing the new JDK updates. If an SVR4 based upgrade (without uninstalling the old packages) is being done on a JDK release earlier than 6u131, 7u121, 8u111, then you should set the new crypto.policy Security property in the java.security file.
Because the old JCE jurisdiction files are left in
Caused by: java.lang.SecurityException: Jurisdiction policy files are not signed by trusted signers! at javax.crypto.JceSecurity.loadPolicies(JceSecurity.java:593) at javax.crypto.JceSecurity.setupJurisdictionPolicies(JceSecurity.java:524)
Two important changes have been made for this issue:
By default, this property will not have a value, and JDK providers will use their own default values. Entries containing an unrecognized algorithm name will be ignored. If the specified default key size is not a parseable decimal integer, that entry will be ignored as well.
By default, this property will not have a value, and the SUN provider will return a DSA KeyPairGenerator object which does not implement the forementioned interface and thus can determine its own provider-specific default value as stated in the java.security.KeyPairGenerator class or by the "jdk.security.defaultKeySize" system property if set.
Deserialization of certain collection instances will cause arrays to be allocated. The ObjectInputFilter.checkInput() method is now called prior to allocation of these arrays. Deserializing instances of ArrayDeque, ArrayList, IdentityHashMap, PriorityQueue, java.util.concurrent.CopyOnWriteArrayList, and the immutable collections (as returned by List.of, Set.of, and Map.of) will call checkInput() with a FilterInfo instance whose style="font-family: Courier New;">serialClass() method returns Object.class. Deserializing instances of HashMap, HashSet, Hashtable, and Properties will call checkInput() with a FilterInfo instance whose serialClass() method returns Map.Entry.class. In both cases, the FilterInfo.arrayLength() method will return the actual length of the array to be allocated. The exact circumstances under which the serialization filter is called, and with what information, is subject to change in future releases.
With one exception, keytool will always print a warning if the certificate, certificate request, or CRL it is parsing, verifying, or generating is using a weak algorithm or key. When a certificate is from an existing
TrustedCertificateEntry, either in the keystore directly operated on or in the
cacerts keystore when the
-trustcacerts option is specified for the
-importcert command, keytool will not print a warning if it is signed with a weak signature algorithm. For example, suppose the file
cert contains a CA certificate signed with a weak signature algorithm,
keytool -printcert -file cert and
keytool -importcert -file cert -alias ca -keystore ks will print out a warning, but after the last command imports it into the keystore,
keytool -list -alias ca -keystore ks will not show a warning anymore.
Precisely, an algorithm or a key is weak if it matches the value of the
jdk.certpath.disabledAlgorithms security property defined in the
For DSA keys, the default signature algorithm for
jarsigner has changed from SHA1withDSA to SHA256withDSA and the default key size for
keytool has changed from 1024 bits to 2048 bits.
Users wishing to revert to the previous behavior can use the
-sigalg option of
jarsigner and specify SHA1withDSA and the
-keysize option of
keytool and specify 1024.
There are a few potential compatibility risks associated with this change:
If you have a script that uses the default key size of
keytool to generate a DSA keypair but then subsequently specifies a specific signature algorithm, ex:
keytool -genkeypair -keyalg DSA -keystore keystore -alias mykey ...
keytool -certreq -sigalg SHA1withDSA -keystore keystore -alias mykey ...
it will fail with one of the following exceptions, because the new 2048-bit keysize default is too strong for SHA1withDSA:
keytool error: java.security.InvalidKeyException: The security strength of SHA-1 digest algorithm is not sufficient for this key size
keytool error: java.security.InvalidKeyException: DSA key must be at most 1024 bits
The workaround is to remove the
-sigalg option and use the stronger SHA256withDSA default or, at your own risk, use the
-keysize option of
keytool to specify a smaller key size (1024).
If you use
jarsigner to sign JARs with the new defaults, previous versions (than this release) of JDK 6 and 7 do not support the stronger defaults and will not be able to verify the JAR.
jarsigner -verify on an earlier release of JDK 6 or 7 will output the following error:
jar is unsigned. (signatures missing or not parsable)
If you add
-J-Djava.security.debug=jar to the
jarsigner command line, the cause will be output:
jar: processEntry caught: java.security.NoSuchAlgorithmException: SHA256withDSA Signature not available
If compatibility with earlier releases is important, you can, at your own risk, use the
-sigalg option of
jarsigner and specify the weaker SHA1withDSA algorithm.
If you use a
PKCS11 keystore, the SunPKCS11 provider does not support the
jarsigner and some
keytool commands may fail with the following exception if
PKCS11 is specified with the
-storetype option, ex:
keytool error: java.security.InvalidKeyException: No installed provider supports this key: sun.security.pkcs11.P11Key$P11PrivateKey
A similar error may occur if you are using NSS with the SunPKCS11 provider. The workaround is to use the
-sigalg option of
keytool and specify SHA1withDSA.
When keytool is operating on a JKS or JCEKS keystore, a warning may be shown that the keystore uses a proprietary format and migrating to PKCS12 is recommended. The keytool's -importkeystore command is also updated so that it can convert a keystore from one type to another if the source and destination point to the same file.
Keytool now prints out the key algorithm and key size of a certificate's public key, in the form of "Subject Public Key Algorithm:
<size>-bit RSA key", where <size> is the key size in bits (ex: 2048).
The Javadoc Standard Doclet documentation has been enhanced to specify that it doesn't validate the content of documentation comments for conformance, nor does it attempt to correct any errors in documentation comments. See the Conformance section in the Doclet documentation.
This release contains fixes for security vulnerabilities described in the Oracle Critical Patch Update. For a more complete list of the bug fixes included in this release, see the JDK 8u151 Bug Fixes page.