Arbitrary Code Injection Affecting rubygem-psych package, versions <0:3.0.2-107.module+el8.4.0+10822+fe4fffb1


Severity

Recommended
medium

Based on CentOS security rating

    Threat Intelligence

    EPSS
    1.21% (86th percentile)

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  • Snyk ID SNYK-CENTOS8-RUBYGEMPSYCH-2113568
  • published 26 Jul 2021
  • disclosed 26 Nov 2019

How to fix?

Upgrade Centos:8 rubygem-psych to version 0:3.0.2-107.module+el8.4.0+10822+fe4fffb1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rubygem-psych package and not the rubygem-psych package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows code injection if the first argument (aka the "command" argument) to Shell#[] or Shell#test in lib/shell.rb is untrusted data. An attacker can exploit this to call an arbitrary Ruby method.

CVSS Scores

version 3.1
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NVD

8.1 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
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Red Hat

8.1 high