Snyk has a published code exploit for this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learningUpgrade com.fasterxml.jackson.core:jackson-databind
to version 2.9.10, 2.8.11.5, 2.6.7.3 or higher.
com.fasterxml.jackson.core:jackson-databind is a library which contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor.
Affected versions of this package are vulnerable to Deserialization of Untrusted Data. A Polymorphic Typing issue was discovered as com.zaxxer.hikari.HikariConfig
was not blocked.
Note: This is a different vulnerability than CVE-2019-16335.
Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating objects from a sequence of bytes is called deserialization. Deserialization of untrusted data (CWE-502) occurs when an application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, allowing the attacker to control the state or the flow of the execution.
com.fasterxml.jackson.core:jackson-databind
allows deserialization of JSON input to Java objects. If an application using this dependency has the ability to deserialize a JSON string from an untrusted source, an attacker could leverage this vulnerability to conduct deserialization attacks.
Exploitation of unsafe deserialization attacks through jackson-databind
requires the following prerequisites:
An application using jackson-databind
is only vulnerable if a user-provided JSON data is deserialized.
Polymorphic type handling refers to the addition of enough type information so that the deserializer can instantiate the appropriate subtype of a value. Use of "default typing" is considered dangerous due to the possibility of an untrusted method (gadget) managing to specify a class that is accessible through the class-loader and therefore, exposing a set of methods and/or fields.
Gadget chains are specially crafted method sequences that can be created by an attacker in order to change the flow of code execution. These gadgets are often methods introduced by third-party components which an attacker could utilise in order to attack the target application. Not every gadget out there is supported by jackson-databind
. The maintainers of jackson-databind
proactively blacklists possible serialization gadgets in an attempt to ensure that it is not possible for an attacker to chain gadgets during serialization.