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VALIDATOR SAC SERIES

Unexpected User Input (Mass Assignment) В¶

Monitor deserialization, alerting if a user deserializes constantly.Restrict or monitor incoming and outgoing network connectivity from containers or servers that deserialize.Log security deserialization exceptions and failures, such as where the incoming type is not the expected type, or the deserialization throws exceptions.

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Isolate code that deserializes, such that it runs in very low privilege environments, such as temporary containers.Bypasses to this technique have been demonstrated. Enforce strict type constraints during deserialization before object creation typically code is expecting a definable set of classes.Implement integrity checks or encryption of the serialized objects to prevent hostile object creation or data tampering.

VALIDATOR SAC SERIES

If that is not possible then consider a series of validation defenses when processing serialized data. You should avoid processing serialized data formats and use easier to defend formats such as JSON when possible. The only safe architectural pattern is to not accept serialized objects from untrusted sources or to only deserialize in limited capacity for only simple data types. For example, itвЂ™s dangerous to deserialize untrusted data or data that can be manipulated by an attacker. Some forms of input are so complex that validation can only minimally protect the application. So while whitelisting helps limit the attack surface by ensuring data is of the right syntactic and semantic validity, blacklisting helps detect and potentially stop obvious attacks.Д¬hallenges of Validating Serialized Data В¶ Even though blacklisting can often be evaded it can often useful to help detect obvious attacks. Blacklisting is prone to error and can be bypassed with various evasion techniques and can be dangerous when depended on by itself. When building secure software, whitelisting is the recommended minimal approach. For example a whitelist validation rule for a US state would be a 2-letter code that is only one of the valid US states.

Whitelisting or whitelist validation attempts to check that a given data matches a set of вЂњknown goodвЂќ rules.

However, this defense could be evaded with a lower case script tag or a script tag of mixed case. For example, a web application may block input that contains the exact text in order to help prevent XSS.

Blacklisting or blacklist validation attempts to check that given data does not contain вЂњknown badвЂќ content.

There are two general approaches to performing input syntax validation, commonly known as blacklisting and whitelisting:

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