low
2.7
CWE
1284 20
Advisory Published
Updated

CVE-2023-23549: DoS via long hostnames

First published: Wed Nov 15 2023(Updated: )

Improper Input Validation in Checkmk <2.2.0p15, <2.1.0p37, <=2.0.0p39 allows priviledged attackers to cause partial denial of service of the UI via too long hostnames.

Credit: security@checkmk.com

Affected SoftwareAffected VersionHow to fix
Checkmk NagVis=2.0.0
Checkmk NagVis=2.0.0-b1
Checkmk NagVis=2.0.0-b2
Checkmk NagVis=2.0.0-b3
Checkmk NagVis=2.0.0-b4
Checkmk NagVis=2.0.0-b5
Checkmk NagVis=2.0.0-b6
Checkmk NagVis=2.0.0-b7
Checkmk NagVis=2.0.0-b8
Checkmk NagVis=2.0.0-i1
Checkmk NagVis=2.0.0-p1
Checkmk NagVis=2.0.0-p10
Checkmk NagVis=2.0.0-p11
Checkmk NagVis=2.0.0-p12
Checkmk NagVis=2.0.0-p13
Checkmk NagVis=2.0.0-p14
Checkmk NagVis=2.0.0-p15
Checkmk NagVis=2.0.0-p16
Checkmk NagVis=2.0.0-p17
Checkmk NagVis=2.0.0-p18
Checkmk NagVis=2.0.0-p19
Checkmk NagVis=2.0.0-p2
Checkmk NagVis=2.0.0-p20
Checkmk NagVis=2.0.0-p21
Checkmk NagVis=2.0.0-p22
Checkmk NagVis=2.0.0-p23
Checkmk NagVis=2.0.0-p24
Checkmk NagVis=2.0.0-p25
Checkmk NagVis=2.0.0-p26
Checkmk NagVis=2.0.0-p27
Checkmk NagVis=2.0.0-p28
Checkmk NagVis=2.0.0-p29
Checkmk NagVis=2.0.0-p3
Checkmk NagVis=2.0.0-p30
Checkmk NagVis=2.0.0-p31
Checkmk NagVis=2.0.0-p32
Checkmk NagVis=2.0.0-p33
Checkmk NagVis=2.0.0-p34
Checkmk NagVis=2.0.0-p35
Checkmk NagVis=2.0.0-p36
Checkmk NagVis=2.0.0-p37
Checkmk NagVis=2.0.0-p38
Checkmk NagVis=2.0.0-p39
Checkmk NagVis=2.0.0-p4
Checkmk NagVis=2.0.0-p5
Checkmk NagVis=2.0.0-p6
Checkmk NagVis=2.0.0-p7
Checkmk NagVis=2.0.0-p8
Checkmk NagVis=2.0.0-p9
Checkmk NagVis=2.1.0
Checkmk NagVis=2.1.0-b1
Checkmk NagVis=2.1.0-b2
Checkmk NagVis=2.1.0-b3
Checkmk NagVis=2.1.0-b4
Checkmk NagVis=2.1.0-b5
Checkmk NagVis=2.1.0-b6
Checkmk NagVis=2.1.0-b7
Checkmk NagVis=2.1.0-b8
Checkmk NagVis=2.1.0-b9
Checkmk NagVis=2.1.0-p1
Checkmk NagVis=2.1.0-p10
Checkmk NagVis=2.1.0-p11
Checkmk NagVis=2.1.0-p12
Checkmk NagVis=2.1.0-p13
Checkmk NagVis=2.1.0-p14
Checkmk NagVis=2.1.0-p15
Checkmk NagVis=2.1.0-p16
Checkmk NagVis=2.1.0-p17
Checkmk NagVis=2.1.0-p18
Checkmk NagVis=2.1.0-p19
Checkmk NagVis=2.1.0-p2
Checkmk NagVis=2.1.0-p20
Checkmk NagVis=2.1.0-p21
Checkmk NagVis=2.1.0-p22
Checkmk NagVis=2.1.0-p23
Checkmk NagVis=2.1.0-p24
Checkmk NagVis=2.1.0-p25
Checkmk NagVis=2.1.0-p26
Checkmk NagVis=2.1.0-p27
Checkmk NagVis=2.1.0-p28
Checkmk NagVis=2.1.0-p29
Checkmk NagVis=2.1.0-p3
Checkmk NagVis=2.1.0-p30
Checkmk NagVis=2.1.0-p31
Checkmk NagVis=2.1.0-p32
Checkmk NagVis=2.1.0-p33
Checkmk NagVis=2.1.0-p34
Checkmk NagVis=2.1.0-p35
Checkmk NagVis=2.1.0-p36
Checkmk NagVis=2.1.0-p4
Checkmk NagVis=2.1.0-p5
Checkmk NagVis=2.1.0-p6
Checkmk NagVis=2.1.0-p7
Checkmk NagVis=2.1.0-p8
Checkmk NagVis=2.1.0-p9
Checkmk NagVis=2.2.0
Checkmk NagVis=2.2.0-b1
Checkmk NagVis=2.2.0-b2
Checkmk NagVis=2.2.0-b3
Checkmk NagVis=2.2.0-b4
Checkmk NagVis=2.2.0-b5
Checkmk NagVis=2.2.0-b6
Checkmk NagVis=2.2.0-b7
Checkmk NagVis=2.2.0-b8
Checkmk NagVis=2.2.0-i1
Checkmk NagVis=2.2.0-p1
Checkmk NagVis=2.2.0-p10
Checkmk NagVis=2.2.0-p11
Checkmk NagVis=2.2.0-p12
Checkmk NagVis=2.2.0-p13
Checkmk NagVis=2.2.0-p2
Checkmk NagVis=2.2.0-p3
Checkmk NagVis=2.2.0-p4
Checkmk NagVis=2.2.0-p5
Checkmk NagVis=2.2.0-p6
Checkmk NagVis=2.2.0-p7
Checkmk NagVis=2.2.0-p8
Checkmk NagVis=2.2.0-p9

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2023-23549?

    CVE-2023-23549 has been classified as a moderate severity vulnerability due to its potential to cause partial denial of service.

  • How do I fix CVE-2023-23549?

    To fix CVE-2023-23549, upgrade your Checkmk installation to version 2.2.0p15 or later, or 2.1.0p37 or later.

  • What causes CVE-2023-23549?

    CVE-2023-23549 is caused by improper input validation that allows attackers to submit excessively long hostnames.

  • Which versions of Checkmk are affected by CVE-2023-23549?

    CVE-2023-23549 affects Checkmk versions below 2.2.0p15, below 2.1.0p37, and all versions of 2.0.0 up to 2.0.0p39.

  • What are the potential impacts of CVE-2023-23549?

    The potential impacts of CVE-2023-23549 include notable disruption of the user interface, leading to a partial denial of service.

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