vulnerability
Ubuntu: USN-5828-1 (CVE-2018-20217): Kerberos vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:S/C:N/I:N/A:P) | Dec 26, 2018 | Mar 22, 2023 | Aug 18, 2025 |
Severity
4
CVSS
(AV:N/AC:M/Au:S/C:N/I:N/A:P)
Published
Dec 26, 2018
Added
Mar 22, 2023
Modified
Aug 18, 2025
Description
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.
Solutions
ubuntu-pro-upgrade-krb5-admin-serverubuntu-pro-upgrade-krb5-kdcubuntu-pro-upgrade-krb5-userubuntu-pro-upgrade-libgssapi-krb5-2ubuntu-pro-upgrade-libkdb5-8ubuntu-pro-upgrade-libkdb5-9
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