Checkmk

Livestatus command injection in Checkmk prediction graph page allows authenticated users to execute arbitrary Livestatus commands by injecting malicious service name parameters due to insufficient input sanitization. Affected versions include Checkmk 2.3.0 before p47, 2.4.0 before p26, and 2.5.0 before b4. The vulnerability requires valid authentication credentials to exploit and results in limited confidentiality, integrity, and availability impact within the Livestatus subsystem.

Livestatus injection in Checkmk's notification test mode allows authenticated users with high privileges to inject arbitrary Livestatus commands via crafted service descriptions in versions prior to 2.5.0b4 and 2.4.0p26. The vulnerability has a CVSS score of 5.1 with limited confidentiality and integrity impact, requiring high-privilege authentication. No public exploit code or active exploitation has been confirmed at time of analysis.

Livestatus injection in Checkmk's monitoring quicksearch function allows authenticated attackers to inject arbitrary livestatus commands through insufficiently sanitized search query parameters in versions prior to 2.5.0b4. The vulnerability requires valid authentication credentials and enables low-impact information disclosure and limited integrity/availability changes within the monitoring system. No public exploit code or active exploitation has been reported at time of analysis.

Local privilege escalation in Checkmk allows site users with high privileges to escalate to root by manipulating site context files processed by the root-executed 'omd' administrative command. Affects Checkmk 2.2.0 (EOL), 2.3.0 before p46, 2.4.0 before p25, and 2.5.0 beta before b3. No public exploit identified at time of analysis. CVSS 9.3 reflects total technical impact, but SSVC assessment indicates non-automatable exploitation requiring existing high-privilege access, tempering the real-world urgency for organizations with strict site user access controls.

Checkmk exposes its session signing secret in configurations synchronized between remote and central sites, allowing a remote site administrator to forge valid session cookies and hijack user sessions on the central monitoring instance. This vulnerability affects Checkmk versions prior to 2.4.0p23, 2.3.0p45, and all 2.2.0 releases when configuration synchronization is enabled. An attacker with administrative privileges on a remote Checkmk site can leverage this exposure to impersonate any user, including central site administrators, potentially gaining complete control over the monitoring infrastructure.

Checkmk contains an improper permission enforcement vulnerability in the deploy_agent endpoint that allows unauthenticated users to enumerate existing hosts by analyzing differential HTTP response codes, resulting in information disclosure. The vulnerability affects Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and end-of-life version 2.2.0, with a CVSS score of 6.3 indicating moderate severity. An attacker with network access can passively discover the infrastructure topology without authentication, though no known active exploitation or public POC has been confirmed at this time.

Checkmk contains an improper permission enforcement vulnerability in the agent-receiver/register_existing endpoint that allows authenticated users to enumerate existing hosts by observing differential HTTP response codes, enabling information disclosure. This affects Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and the end-of-life 2.2.0 branch. While not currently listed as actively exploited in known vulnerability catalogs, the low CVSS score of 5.3 reflects limited confidentiality impact and the requirement for prior authentication, though the straightforward nature of the enumeration technique presents moderate real-world risk.

Data loss in Checkmk versions before 2.4.0p23, 2.3.0p43, and 2.2.0 results from a logic error in the remove_password() function that allows low-privileged users to delete sensitive information. An authenticated attacker can exploit this vulnerability to cause unintended data loss without requiring user interaction. No patch is currently available for affected deployments.

Improper neutralization of input in Checkmk versions 2.4.0 before 2.4.0p22, and 2.3.0 before 2.3.0p43 allows an attacker that can manipulate a host's check output to inject malicious JavaScript into the Synthetic Monitoring HTML logs, which can then be accessed via a crafted phishing link. [CVSS 5.4 MEDIUM]

In Checkmk versions prior to 2.4.0p16, 2.3.0p41, and all versions of 2.2.0 and older, the mk_inotify plugin creates world-readable and writable files, allowing any local user on the system to read. Rated medium severity (CVSS 4.8), this vulnerability is low attack complexity. No vendor patch available.

Insufficient permission validation in Checkmk 2.4.0 before version 2.4.0p16 allows low-privileged users to modify notification parameters via the REST API, which could lead to unauthorized actions or. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Insufficient permission validation on multiple REST API endpoints in Checkmk 2.2.0, 2.3.0, and 2.4.0 before version 2.4.0p16 allows low-privileged users to perform unauthorized actions or obtain. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

A security vulnerability in autocomplete endpoint within the RestAPI of Checkmk (CVSS 8.8) that allows an authenticated user. High severity vulnerability requiring prompt remediation.

Packages downloaded by Checkmk's automatic agent updates on Linux and Solaris have incorrect permissions in Checkmk < 2.4.0p1, < 2.3.0p32, < 2.2.0p42 and <= 2.1.0p49 (EOL). Rated medium severity (CVSS 4.3), this vulnerability is low attack complexity. No vendor patch available.

Argument injection in special agent configuration in Checkmk <2.4.0p1, <2.3.0p32, <2.2.0p42 and 2.1.0 allows authenticated attackers to write arbitrary files. Rated high severity (CVSS 8.7), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Privilege escalation in jar_signature agent plugin in Checkmk versions <2.4.0b7 (beta), <2.3.0p32, <2.2.0p42, and 2.1.0p49 (EOL) allow user with write access to JAVA_HOME/bin directory to escalate. Rated medium severity (CVSS 5.2), this vulnerability is low attack complexity. No vendor patch available.

Files to be deployed with agents are accessible without authentication in Checkmk 2.1.0, Checkmk 2.2.0, Checkmk 2.3.0 and <Checkmk 2.4.0b6 allows attacker to access files that could contain secrets. Rated medium severity (CVSS 6.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Insertion of Sensitive Information into Log File in Checkmk GmbH's Checkmk versions <2.3.0p29, <2.2.0p41 and <=2.1.0p49 (EOL) causes remote site authentication secrets to be written to log files. Rated high severity (CVSS 7.1), this vulnerability is low attack complexity. No vendor patch available.

Improper neutralization of livestatus command delimiters in a specific endpoint within RestAPI of Checkmk prior to 2.2.0p39, 2.3.0p25, and 2.1.0p51 (EOL) allows arbitrary livestatus command. Rated medium severity (CVSS 6.0), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Session logout could be overwritten in Checkmk GmbH's Checkmk versions <2.3.0p30, <2.2.0p41, and 2.1.0p49 (EOL). Rated low severity (CVSS 2.3), this vulnerability is remotely exploitable. No vendor patch available.

Insertion of Sensitive Information into Log File in Checkmk GmbH's Checkmk versions <2.3.0p27, <2.2.0p40, and 2.1.0p51 (EOL) causes LDAP credentials to be written to Apache error log file accessible. Rated medium severity (CVSS 5.6), this vulnerability is low attack complexity. No vendor patch available.