CVE-2020-28196

Publication date 6 November 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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

Show unmaintained releases

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	Fixed 1.12+dfsg-2ubuntu5.4+esm2 Ubuntu Pro

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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	Upstream: 57415dd

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