CVE-2016-6793

The DiskFileItem class in Apache Wicket 6.x before 6.25.0 and 1.5.x before 1.5.17 allows remote attackers to cause a denial of service (infinite loop) and write to, move, and delete files with the permissions of DiskFileItem, and if running on a Java VM before 1.3.1, execute arbitrary code via a crafted serialized Java object.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• http://www.openwall.com/lists/oss-security/2016/12/31/1
• http://www.securityfocus.com/archive/1/539975/100/0/threaded
• http://www.securityfocus.com/bid/95168
• http://www.securitytracker.com/id/1037541
• https://wicket.apache.org/news/2016/12/31/cve-2016-6793.html
• https://www.tenable.com/security/research/tra-2016-23
• http://www.openwall.com/lists/oss-security/2016/12/31/1
• http://www.securityfocus.com/archive/1/539975/100/0/threaded
• http://www.securityfocus.com/bid/95168
• http://www.securitytracker.com/id/1037541
• https://wicket.apache.org/news/2016/12/31/cve-2016-6793.html
• https://www.tenable.com/security/research/tra-2016-23