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jackson-databind: Unsafe deserialization due to incomplete black list (incomplete fix for CVE-2017-7525)

Published Feb 6, 2018

Description

A deserialization flaw was discovered in the jackson-databind in versions before 2.8.10 and 2.9.1, which could allow an unauthenticated user to perform code execution by sending the maliciously crafted input to the readValue method of the ObjectMapper. This issue extends the previous flaw CVE-2017-7525 by blacklisting more classes that could be used maliciously.

Affected products

Remediation

Red Hat statement

This issue affects the versions of jackson-databind (in Satellite 6.0 and 6.1) and candlepin (which embeds a copy of jackson-databind in Satellite 6.2) as shipped with Red Hat Satellite 6.x. However the affected code is NOT used at this time: Candlepin currently uses the default type resolution configuration for the ObjectMappers it creates/uses. Nowhere in candlepin do we enable global polymorphic deserialization via enableDefaultTyping(...), therefore based on the documentation sited BZ 1462702 , candlepin should not be affected. However as the vulnerable software ships with the product we have marked them as vulnerable to ensure the issue is tracked. JBoss EAP 7.x only uses the vulnerable Jackson Databind library for marshalling and unmarshalling of JSON objects passed to JAX-RS webservices. Some advise about how to remain safe when using JAX-RS webservices on JBoss EAP 7.x is available here: https://access.redhat.com/solutions/3279231

Red Hat mitigation

Mitigation to this problem is to not trigger polymorphic desrialization globally by using: objectMapper.enableDefaultTyping() and rather use @JsonTypeInfo on the class property to explicitly define the type information. For more information on this issue please refer to https://www.github.com/mbechler/marshalsec/blob/master/marshalsec.pdf?raw=true

Metrics

Weaknesses (2)

CWE-184

CWE-502

Deserialization of Untrusted Data

References (47)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Feb 6, 2018
Updated Sep 16, 2024
Reserved Oct 8, 2017
Link CVE-2017-15095
CISA Vulnrichment
Updated n/a
NVD
Status Modified
Modified Jun 17, 2026
Link CVE-2017-15095
Red Hat
Severity Important
Public date Nov 2, 2017
Links CVE-2017-15095 - Bugzilla
GHSA-H592-38CM-4GGP