CVE-2023-36054

Publication date 7 August 2023

Last updated 19 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

lib/kadm5/kadm_rpc_xdr.c in MIT Kerberos 5 (aka krb5) before 1.20.2 and 1.21.x before 1.21.1 frees an uninitialized pointer. A remote authenticated user can trigger a kadmind crash. This occurs because _xdr_kadm5_principal_ent_rec does not validate the relationship between n_key_data and the key_data array count.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
krb5	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Fixed 1.20.1-1ubuntu0.1
	22.04 LTS jammy	Fixed 1.19.2-2ubuntu0.3
	20.04 LTS focal	Fixed 1.17-6ubuntu4.4
	18.04 LTS bionic	Fixed 1.16-2ubuntu0.4+esm1
	16.04 LTS xenial	Fixed 1.13.2+dfsg-5ubuntu2.2+esm4
	14.04 LTS trusty	Fixed 1.12+dfsg-2ubuntu5.4+esm4

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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: ef08b09

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H