CVE-2018-20217
krb5 - security update
5.3
MEDIUM
CVSS 3.1
EPSS 2.7%
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.
How to fix CVE-2018-20217
To remediate CVE-2018-20217, upgrade the affected package to a fixed version below.
- Alpine/krb5—upgrade to 1.15.4-r0 or later
- —upgrade to 1.16.2-1 or later
- —upgrade to 1.12.1+dfsg-19+deb8u5 or later
- —upgrade to 1.15-1+deb9u3 or later
Is CVE-2018-20217 being exploited?
Low — EPSS is 2.7%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.15.4-r0
- from 0, < 1.16.2-1
- from 0, < 1.12.1+dfsg-19+deb8u5
- from 0, < 1.15-1+deb9u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |