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DNS Hijack Attack Affecting rubygems-update package, versions >=2.0.0, <2.0.17 >=2.2.0, <2.2.5 >=2.4.0, <2.4.8

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required

    Threat Intelligence

    EPSS 0.64% (79th percentile)
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NVD
4.3 medium
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Red Hat
8 high

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  • Snyk ID SNYK-RUBY-RUBYGEMSUPDATE-472657
  • published 13 Nov 2019
  • disclosed 8 Jun 2015
  • credit unknown
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Introduced: 8 Jun 2015

CVE-2015-4020 Open this link in a new tab
CWE-20 Open this link in a new tab

How to fix?

Upgrade rubygems-update to version 2.0.17, 2.2.5, 2.4.8 or higher.

Overview

rubygems-update is an inbuilt rubygem for updating rubygems.

Affected versions of this package are vulnerable to DNS Hijack Attack. It does not validate the hostname when fetching gems or making API requests, which allows remote attackers to redirect requests to arbitrary domains via a crafted DNS SRV record with a domain that is suffixed with the original domain name, aka a DNS hijack attack. NOTE: this vulnerability exists because to an incomplete fix for CVE-2015-3900.