CVE-2026-35847 in dnsmgr
Summary
by MITRE • 07/31/2026
An issue in dnsmgr v.2.15 and before allows a local attacker to execute arbitrary code via the ping function of the CheckUils.php file
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Analysis
by VulDB Data Team • 07/31/2026
The vulnerability resides within the dnsmgr software version 2.15 and earlier, specifically targeting the CheckUils.php file's ping function implementation. This represents a critical local privilege escalation vector that enables attackers with low-privilege access to execute arbitrary code on the affected system. The flaw stems from inadequate input validation and sanitization within the ping functionality, creating an environment where malicious payloads can be injected and subsequently executed with elevated privileges. The vulnerability operates through a command injection attack pattern that aligns with CWE-77 and CWE-89, where user-supplied parameters are directly incorporated into system commands without proper neutralization.
The technical exploitation occurs when the ping function processes user input through CheckUils.php, failing to properly validate or escape special characters that could alter the intended command execution flow. This allows an attacker to append malicious commands that get executed by the underlying operating system shell. The vulnerability's impact extends beyond simple code execution as it provides a pathway for attackers to establish persistent access, escalate privileges, and potentially compromise the entire network infrastructure managed by dnsmgr. Attackers can leverage this flaw to gain unauthorized control over DNS management functions, potentially leading to complete system compromise.
From an operational standpoint, this vulnerability presents significant risk to organizations relying on dnsmgr for DNS services, as it allows local attackers with basic user accounts to escalate their privileges and execute arbitrary commands. The attack surface is particularly concerning in environments where multiple users have access to the system, as any compromised account could potentially be leveraged to gain full administrative control. The vulnerability affects systems running dnsmgr versions up to and including 2.15, creating widespread exposure across various network infrastructures that depend on this DNS management solution.
Security mitigations should prioritize immediate patching of the affected dnsmgr versions to address the command injection vulnerability in CheckUils.php. Organizations must implement proper input validation and sanitization measures for all user-supplied data within the ping function and similar system utilities. Network segmentation and principle of least privilege should be enforced to limit local access rights, while monitoring systems should be configured to detect anomalous command execution patterns. Additionally, the vulnerability demonstrates characteristics aligned with ATT&CK technique T1059.001 for command and scripting interpreter, highlighting the need for comprehensive endpoint detection and response capabilities. Organizations should also consider implementing web application firewalls to prevent malicious input from reaching the vulnerable components.
The broader implications of this vulnerability extend to DNS infrastructure security, where attackers could potentially manipulate DNS records, redirect traffic, or establish persistent backdoors through the compromised management interface. This threat model aligns with ATT&CK technique T1071.004 for application layer protocol and underscores the critical importance of securing DNS management interfaces against local privilege escalation attacks. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other system components, particularly those handling user input through system command execution pathways. The vulnerability serves as a reminder of the critical need for secure coding practices and proper input validation in all system utilities that interface with operating system commands.