Vulnerability Name:

CVE-2021-42072 (CCN-212652)

Assigned:2021-11-02
Published:2021-11-02
Updated:2022-05-15
Summary:An issue was discovered in Barrier before 2.4.0. The barriers component (aka the server-side implementation of Barrier) does not sufficiently verify the identify of connecting clients. Clients can thus exploit weaknesses in the provided protocol to cause denial-of-service or stage further attacks that could lead to information leaks or integrity corruption.
CVSS v3 Severity:8.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
7.7 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
6.8 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N)
5.9 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:6.5 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
6.6 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:C/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-287
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-42072

Source: MLIST
Type: Exploit, Mailing List, Third Party Advisory
[oss-security] 20211102 Barrier "software KVM switch" multiple remote security issues

Source: XF
Type: UNKNOWN
debauchee-cve202142072-mitm(212652)

Source: CCN
Type: Barrier GIT Repository
Barrier software KVM switch

Source: MISC
Type: Release Notes, Third Party Advisory
https://github.com/debauchee/barrier/releases/tag/v2.4.0

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2022-09c1a5bab8

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2022-3dc519f073

Source: CCN
Type: oss-sec Mailing List, Tue, 2 Nov 2021 13:06:16 +0100
Barrier software KVM switch multiple remote security issues

Vulnerable Configuration:Configuration 1:
  • cpe:/a:barrier_project:barrier:*:*:*:*:*:*:*:* (Version < 2.4.0)

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:34:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:35:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:111998
    P
    		barrier-2.4.0-1.1 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:111523
    P
    		Security update for barrier (Moderate)
    2021-12-19
    oval:org.opensuse.security:def:11157
    P
    		Security update for barrier (Moderate)
    2021-12-19
    oval:org.opensuse.security:def:111137
    P
    		Security update for barrier (Moderate)
    2021-11-22
    BACK
    barrier_project barrier *
    fedoraproject fedora 34
    fedoraproject fedora 35