CVE-2020-28196

Publication date 6 November 2020

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.

Status

Package Ubuntu Release Status
krb5 20.10 groovy
Fixed 1.17-10ubuntu0.1
20.04 LTS focal
Fixed 1.17-6ubuntu4.1
18.04 LTS bionic
Fixed 1.16-2ubuntu0.2
16.04 LTS xenial
Fixed 1.13.2+dfsg-5ubuntu2.2
14.04 LTS trusty

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
krb5

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-4635-1
    • Kerberos vulnerability
    • 17 November 2020

Other references