Arbitrary Code Execution Affecting symfony/symfony package, versions >=3.4.0, <3.4.35 >=4.2.0, <4.2.12 >=4.3.0, <4.3.8


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team

    Threat Intelligence

    EPSS
    0.61% (80th percentile)

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  • Snyk ID SNYK-PHP-SYMFONYSYMFONY-535353
  • published 22 Nov 2019
  • disclosed 13 Nov 2019
  • credit wisdomtree

How to fix?

Upgrade symfony/symfony to version 3.4.35, 4.2.12, 4.3.8 or higher.

Overview

symfony/symfony is a PHP framework for web applications and a set of reusable PHP components.

Affected versions of this package are vulnerable to Arbitrary Code Execution. When an instance of TagAwareAdapter is destructed, Symfony execute callables stored in privates properties in order to invalidates tags. When the instance has been created by unserializing an external payload, those properties are not checked leading to a remote code execution.

CVSS Scores

version 3.1
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Snyk

Recommended
7.3 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    Low
  • Integrity (I)
    Low
  • Availability (A)
    Low
Expand this section

NVD

9.8 critical