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6.5
CVSSv2

CVE-2021-42072

Published: 08/11/2021 Updated: 07/11/2023
CVSS v2 Base Score: 6.5 | Impact Score: 6.4 | Exploitability Score: 8
CVSS v3 Base Score: 8.8 | Impact Score: 5.9 | Exploitability Score: 2.8
VMScore: 578
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P

Vulnerability Summary

An issue exists in Barrier prior to 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.

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barrier project barrier

fedoraproject fedora 34

fedoraproject fedora 35

Vendor Advisories

Arch Linux Issues:
A security issue has been found in Barrier before version 240 Contrary to the client side, the server does not verify client connections in any way Since the server is taking over control of the client this may seem enough at first glance However it means that the SSL connection does not add any authenticity or authentication for the server si ...

Mailing Lists

Full Disclosure: Barrier "software KVM switch" multiple remote security issues
Hello list, recently the Barrier project [1] published new releases that address a couple of security issues I reported to them Following is the full review report I shared with upstream on 2021-07-30 Attached to this email is a tarball containing reproducer scripts that are mentioned in the report [1]: githubcom/debauchee/barrier I ...

References

CWE-287https://github.com/debauchee/barrier/releases/tag/v2.4.0http://www.openwall.com/lists/oss-security/2021/11/02/4https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XMU3STOKHPEZSC54MZ42YBFFC2R3BU2Q/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CIEVNCFEFO7L3NTM4VUZB3WKYYCBTFCI/https://nvd.nist.govhttp://seclists.org/oss-sec/2021/q4/87https://security.archlinux.org/CVE-2021-42072
CVSSv2
CVSSv2
CVSSv3
VMScore
Recommendations:
CVE-2023-49223CVE-2024-0044information disclosureCVE-2024-35753HTML injectionCVE-2024-21306CVE-2024-35733SQL injectionCVE-2024-35732
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