CVE-2022-21946

Local session hijacking via unrestricted sudoers rule

Published Mar 16, 2022 · Updated Sep 17, 2024

Incorrect permissions in cscreen 1.2-1.3 and earlier allow local users to access and manipulate shared console sessions. The /etc/sudoers.d/cscreen rule authorizes ALL users to run /usr/bin/screen as _cscreen without a password instead of limiting the rule to the _cscreen group. Local users need only host access; the rule grants _cscreen's tty and dialout privileges, and a running service exposes its persistent session.

CVSS severity5.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect permissions in cscreen 1.2-1.3 and earlier allow local users to access and manipulate shared console sessions. The /etc/sudoers.d/cscreen rule authorizes ALL users to run /usr/bin/screen as _cscreen without a password instead of limiting the rule to the _cscreen group. Local users need only host access; the rule grants _cscreen's tty and dialout privileges, and a running service exposes its persistent session.

The record

CVE
CVE-2022-21946
Published
Mar 16, 2022
Updated
Sep 17, 2024
Vendor
OpenSUSE
Product
openSUSE Factory
Classifications
CWE-732, T1548.003
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=cscreen <=1.2-1.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenSUSE · openSUSE Factoryversion=cscreen <=1.2-1.3

Published CVSS scores

5.3NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1548.003Sudo and Sudo Caching

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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