CVE-2017-4995

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    CVE-2017-4995

    Published: 27 Nov 2017Last Modified: 8 Jul 2026

    Summary:

    Details: An issue was discovered in Pivotal Spring Security 4.2.0.RELEASE through 4.2.2.RELEASE, and Spring Security 5.0.0.M1. When configured to enable default typing, Jackson contained a deserialization vulnerability that could lead to arbitrary code execution. Jackson fixed this vulnerability by blacklisting known "deserialization gadgets." Spring Security configures Jackson with global default typing enabled, which means that (through the previous exploit) arbitrary code could be executed if all of the following is true: (1) Spring Security's Jackson support is being leveraged by invoking SecurityJackson2Modules.getModules(ClassLoader) or SecurityJackson2Modules.enableDefaultTyping(ObjectMapper); (2) Jackson is used to deserialize data that is not trusted (Spring Security does not perform deserialization using Jackson, so this is an explicit choice of the user); and (3) there is an unknown (Jackson is not blacklisting it already) "deserialization gadget" that allows code execution present on the classpath. Jackson provides a blacklisting approach to protecting against this type of attack, but Spring Security should be proactive against blocking unknown "deserialization gadgets" when Spring Security enables default typing.

    References: http://www.securityfocus.com/bid/99080, https://lists.apache.org/thread.html/4641ed8616ccc2c1fbddac2c3dc9900c96387bc226eaf0232d61909b%40%3Ccommits.cassandra.apache.org%3E, https://lists.apache.org/thread.html/r42ac3e39e6265db12d9fc6ae1cd4b5fea7aed9830dc6f6d58228fed7%40%3Ccommits.cassandra.apache.org%3E, https://lists.apache.org/thread.html/rf7f87810c38dc9abf9f93989f76008f504cbf7c1a355214640b2d04c%40%3Ccommits.cassandra.apache.org%3E, https://pivotal.io/security/cve-2017-4995

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 24fcb6c45a55333e5b856b6c73f14b68ceca0e19
    Fixed -None

    Affected versions

    4.2.0-release
    4.2.1-release
    4.2.2-release
    4.2.2.RELEASE
    4.2.1.RELEASE
    4.2.0.RELEASE

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2017-4995 | CVE-DB