Overview
Eval Injection vulnerabilities present a critical risk to system security, and the recent discovery of CVE-2025-26845 in Znuny up to version 7.1.3 is no exception. Anyone with write access to the configuration file can leverage this vulnerability, leading to potential system compromise or data leakage. This issue is particularly troubling because the user running the backup.pl script can inadvertently execute a malicious command, unknowingly causing significant harm.
Vulnerability Summary
CVE ID: CVE-2025-26845
Severity: Critical (CVSS score: 9.8)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Znuny | Up to and including 7.1.3
How the Exploit Works
An attacker with write access to the configuration file can inject malicious code into the file. This injected code is then executed when the backup.pl script is run by a user. The script, not designed to validate or sanitize the contents of the configuration file, blindly processes the injected code, leading to the execution of the attacker’s command.
Conceptual Example Code
Imagine that an attacker has gained write access to the configuration file and decides to inject the following malicious code:
; rm -rf / --no-preserve-root # deletes everything in the filesystemWhen the backup.pl script is run, it would execute this command, causing the deletion of all files in the filesystem.
Impact
A successful exploit of this vulnerability could lead to a complete system compromise, data leakage, or even a total system crash if critical system files are deleted. Depending on the injected command, an attacker could potentially gain unauthorized access, extract sensitive information, or disrupt the normal operation of the system.
Mitigation
As a temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to detect and block attempts to exploit this vulnerability. However, the most effective solution is to apply the vendor-supplied patch. Znuny has already released a patch for this issue, and users are urged to apply this update as soon as possible to prevent potential exploits.