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CVE-2018-20217

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-5828-1
Posted Jan 26, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5828-1 - It was discovered that Kerberos incorrectly handled certain S4U2Self requests. An attacker could possibly use this issue to cause a denial of service. This issue was only addressed in Ubuntu 16.04 ESM and Ubuntu 18.04 LTS. Greg Hudson discovered that Kerberos PAC implementation incorrectly handled certain parsing operations. A remote attacker could use this issue to cause a denial of service, or possibly execute arbitrary code.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2018-20217, CVE-2022-42898
SHA-256 | 172f865df6482a98eeb5142645b6b3d004e0fcbb18be188deb32de7ee6994283
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