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Reachable Assertion Affecting krb5-libs package, versions <0:1.15.1-46.48.amzn1

0.0
medium

Snyk CVSS

    Attack Complexity High
    Availability High

    Threat Intelligence

    EPSS 0.3% (70th percentile)
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NVD
5.3 medium
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Red Hat
5.3 medium

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  • Snyk ID SNYK-AMZN201803-KRB5LIBS-1722397
  • published 27 Sep 2021
  • disclosed 26 Dec 2018
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Introduced: 26 Dec 2018

CVE-2018-20217 Open this link in a new tab
CWE-617 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2018.03 krb5-libs to version 0:1.15.1-46.48.amzn1 or higher.
This issue was patched in ALAS-2020-1374.

NVD Description

Note: Versions mentioned in the description apply only to the upstream krb5-libs package and not the krb5-libs package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.

A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.