CVE-2019-14893: Deserialization of Untrusted Data

March 2, 2020 (updated March 4, 2020)

A flaw was discovered in FasterXML jackson-databind that permits polymorphic deserialization of malicious objects. Specifically when the xalan JNDI gadget is used in conjunction with polymorphic type handling methods such as enableDefaultTyping(). The gadget may also be combined with @JsonTypeInfo when it is using Id.CLASS or Id.MINIMAL_CLASS, or in any other way which ObjectMapper.readValue might instantiate objects from unsafe sources. An attacker could use this flaw to execute arbitrary code.

References

bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14893
nvd.nist.gov/vuln/detail/CVE-2019-14893

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