CVE-2017-4995

描述

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.

如何修補 CVE-2017-4995

要修補 CVE-2017-4995,請將受影響套件升級到下列已修補版本。

• —升級至 4.2.3.RELEASE 或更新版本

CVE-2017-4995 正在被利用嗎?

低 — EPSS 為 2.5%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 4.2.0.RELEASE, < 4.2.3.RELEASE

CVSS 分數