CVE-2021-38173

Published on: 08/07/2021 12:00:00 AM UTC

Last Modified on: 03/25/2022 03:43:00 PM UTC

CVE-2021-38173

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

Certain versions of Debian Linux from Debian contain the following vulnerability:

Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SSH commands using ssh_filter_btrbk.sh in authorized_keys.

CVE-2021-38173 has been assigned by [email protected] to track the vulnerability - currently rated as CRITICAL severity.

CVSS3 Score: 9.8 - CRITICAL

Attack Vector ^ⓘ	Attack Complexity	Privileges Required	User Interaction
NETWORK	LOW	NONE	NONE
Scope	Confidentiality Impact	Integrity Impact	Availability Impact
UNCHANGED	HIGH	HIGH	HIGH

CVSS2 Score: 7.5 - HIGH

Access Vector^ⓘ	Access Complexity	Authentication
NETWORK	LOW	NONE
Confidentiality Impact	Integrity Impact	Availability Impact
PARTIAL	PARTIAL	PARTIAL

CVE References

Description	Tags ^ⓘ	Link
[SECURITY] Fedora 34 Update: btrbk-0.31.3-1.fc34 - package-announce - Fedora Mailing-Lists	lists.fedoraproject.org text/html	FEDORA FEDORA-2022-dc62389784
[SECURITY] Fedora 35 Update: btrbk-0.31.3-1.fc35 - package-announce - Fedora Mailing-Lists	lists.fedoraproject.org text/html	FEDORA FEDORA-2022-a66734e7a2
btrbk/ChangeLog at master · digint/btrbk · GitHub	github.com text/html	CONFIRM github.com/digint/btrbk/blob/master/ChangeLog
[SECURITY] [DLA 2755-1] btrbk security update	lists.debian.org text/html	MLIST [debian-lts-announce] 20210905 [SECURITY] [DLA 2755-1] btrbk security update
ssh_filter_btrbk.sh: fix alternation regex · digint/[email protected] · GitHub	github.com text/html	MISC github.com/digint/btrbk/commit/58212de771c381cd4fa05625927080bf264e9584

By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].

Related QID Numbers

178785 Debian Security Update for btrbk (DLA 2755-1)
180187 Debian Security Update for btrbk (CVE-2021-38173)
282254 Fedora Security Update for btrbk (FEDORA-2022-dc62389784)
282255 Fedora Security Update for btrbk (FEDORA-2022-a66734e7a2)

Exploit/POC from Github

PoC for exploiting CVE-2021-38173 : Btrbk before 0.31.2 allows command execution because of the mishandling of remote…

Known Affected Configurations (CPE V2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Debian	Debian Linux	9.0	All	All	All
Application	Digint	Btrbk	All	All	All	All
Operating System	Fedoraproject	Fedora	34	All	All	All
Operating System	Fedoraproject	Fedora	35	All	All	All

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*:
cpe:2.3:a:digint:btrbk:*:*:*:*:*:*:*:*:
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*:
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*:

No vendor comments have been submitted for this CVE

Social Mentions

Source	Title	Posted (UTC)
@CVEreport	CVE-2021-38173 : Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering… twitter.com/i/web/status/1…	2021-08-07 19:03:30
@threatmeter	CVE-2021-38173 Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SS… twitter.com/i/web/status/1…	2021-08-08 07:09:29