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CVE-2020-27840

Publication date 24 March 2021

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.

Read the notes from the security team

Status

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
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

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)

Other references