CVE-2021-20277

Publication date 24 March 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ldb	20.10 groovy	Fixed 2:2.1.4-2ubuntu0.1
	20.04 LTS focal	Fixed 2:2.0.10-0ubuntu0.20.04.3
	18.04 LTS bionic	Fixed 2:1.2.3-1ubuntu0.2
	16.04 LTS xenial	Fixed 2:1.1.24-1ubuntu3.2
	14.04 LTS trusty	Fixed 1:1.1.24-0ubuntu0.14.04.2+esm1 Ubuntu Pro
samba	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

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Notes

mdeslaur

This issue is actually in the ldb package, the samba package uses the system ldb library, not the included one

Patch details

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

Package	Patch details
ldb	Upstream: https://bugzilla.samba.org/attachment.cgi?id=16525 Upstream: https://bugzilla.samba.org/attachment.cgi?id=16527 Upstream: https://bugzilla.samba.org/attachment.cgi?id=16528
samba	Upstream: https://bugzilla.samba.org/attachment.cgi?id=16525 Upstream: https://bugzilla.samba.org/attachment.cgi?id=16527 Upstream: https://bugzilla.samba.org/attachment.cgi?id=16528

Severity score breakdown

Parameter	Value
Base score	7.1 · High
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H