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Ubuntu.comUB:CVE-2020-25721

HistoryNov 09, 2021 - 12:00 a.m.

CVE-2020-25721

2021-11-0900:00:00

ubuntu.com

kerberos

sid

samaccountname

tickets

samba

linux

bugs

stable ad identifiers

ubuntu

CVSS2

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.005

Percentile

75.5%

JSON

Kerberos acceptors need easy access to stable AD identifiers (eg
objectSid). Samba as an AD DC now provides a way for Linux applications to
obtain a reliable SID (and samAccountName) in issued tickets.

Bugs

Notes

Author	Note
mdeslaur	Fixing this in Ubuntu 18.04 LTS would require substantial code backports. We will not be fixing this issue in Ubuntu 18.04 LTS. In environments where this is of concern, we recommend updating to a more recent Ubuntu version.

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchsamba< 2:4.13.14+dfsg-0ubuntu0.20.04.1UNKNOWN
ubuntu21.04noarchsamba< 2:4.13.14+dfsg-0ubuntu0.21.04.1UNKNOWN
ubuntu21.10noarchsamba< 2:4.13.14+dfsg-0ubuntu0.21.10.1UNKNOWN
ubuntu22.04noarchsamba< 2:4.13.14+dfsg-0ubuntu1UNKNOWN
ubuntu22.10noarchsamba< 2:4.13.14+dfsg-0ubuntu1UNKNOWN
ubuntu23.04noarchsamba< 2:4.13.14+dfsg-0ubuntu1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	samba	< 2:4.13.14+dfsg-0ubuntu0.20.04.1	UNKNOWN
ubuntu	21.04	noarch	samba	< 2:4.13.14+dfsg-0ubuntu0.21.04.1	UNKNOWN
ubuntu	21.10	noarch	samba	< 2:4.13.14+dfsg-0ubuntu0.21.10.1	UNKNOWN
ubuntu	22.04	noarch	samba	< 2:4.13.14+dfsg-0ubuntu1	UNKNOWN
ubuntu	22.10	noarch	samba	< 2:4.13.14+dfsg-0ubuntu1	UNKNOWN
ubuntu	23.04	noarch	samba	< 2:4.13.14+dfsg-0ubuntu1	UNKNOWN