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


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.23% (61st percentile)

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  • Snyk IDSNYK-AMZN201803-KRB5LIBS-1722397
  • published27 Sept 2021
  • disclosed26 Dec 2018

Introduced: 26 Dec 2018

CVE-2018-20217  (opens in a new tab)
CWE-617  (opens 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.

CVSS Scores

version 3.1