Oracle Java SE 6u181 and 7u171 fixes an unspecified vulnerability in the Serialization component (CVE-2018-2657). Upstream has CVSS scored this issue as: 5.3/CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

External Reference:

http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html#AppendixJAVA

It was discovered that the DNS client implementation in the JNDI component of OpenJDK did not use random source ports when sending out DNS queries. This would make it easier for a remote attacker to spoof responses to those queries.

It was discovered that the LdapLoginModule class in the LDAP component of OpenJDK failed to properly encode special characters in user names when adding them to LDAP search query. A remote attacker could possibly use this flaw to manipulate LDAP queries performed by the LdapLoginModule class.

It was discovered that multiple encryption key classes (DESKey, DESedeKey, PBEKey, PBKDF2KeyImpl) in the crypto provider in the Libraries component of OpenJDK did not properly synchronize access to their internal key data from multiple threads. This could possibly cause a multi-threaded Java application to apply weak encryption to data because of use of key that was zeroed out during object finalization.