CVE-2018-5709

Publication date 16 January 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
krb5	22.04 LTS jammy	Ignored see notes
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Ignored see notes
	19.10 eoan	Ignored end of life
	19.04 disco	Ignored end of life
	18.10 cosmic	Ignored end of life
	18.04 LTS bionic	Ignored see notes
	17.10 artful	Ignored end of life
	16.04 LTS xenial	Ignored see notes
	14.04 LTS trusty	Ignored see notes

Notes

ebarretto

according to debian security tracker: non-issue, codepath is only run on trusted input, potential integer overflow is non-issue

ccdm94

no patch available in 2022-05-11. Unlikely to have a security impact. This is not considered a security issue according to various sources.

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	High
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N