4.2

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2019-10399

CVE-2019-10399: Sandbox bypass vulnerability in Jenkins Script Security Plugin

A sandbox bypass vulnerability in Jenkins Script Security Plugin 1.62 and earlier related to the handling of property names in property expressions in increment and decrement expressions allowed attackers to execute arbitrary code in sandboxed scripts.

(GitHub Advisory)

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CVE-2019-10399

CVE-2019-10399:

4.2

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
org.jenkins-ci.plugins:script-security	maven	<= 1.62	1.63

Technical Details

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Root Cause Analysis

The vulnerability stems from improper sandbox validation of two key areas: 1) Property name resolution in increment/decrement expressions (CVE-2019-10399 specifically calls out this vector), and 2) General method/property name validation in assignment contexts. The commit patching this updated groovy-sandbox to v1.23 and added tests showing rejection of malicious patterns like 't.({...}())++' and '++({...}())'. The tests in SandboxInterceptorTest.java demonstrate scenarios where property names and subexpressions in postfix/prefix operations could execute restricted methods like Jenkins.getInstance(). The vulnerable functions are in the sandbox interceptor logic handling these expression types.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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