CVE-2006-2479 in Bitrix Site Manager
Summary
by MITRE
The Update functionality in Bitrix Site Manager 4.1.x does not verify the authenticity of downloaded updates, which allows remote attackers to obtain sensitive information and ultimately execute arbitrary PHP code via DNS cache poisoning that redirects the user to a malicious site.
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Analysis
by VulDB Data Team • 09/09/2017
The vulnerability identified as CVE-2006-2479 represents a critical security flaw in Bitrix Site Manager version 4.1.x that fundamentally undermines the integrity of the software update mechanism. This issue stems from the absence of proper authentication verification during the update process, creating a pathway for malicious actors to exploit the system through DNS cache poisoning techniques. The vulnerability operates at the intersection of trust relationships and network security protocols, where the application fails to validate the source of update files, thereby opening doors to unauthorized code execution and information disclosure.
The technical implementation of this vulnerability exploits the trust model inherent in the update system by leveraging DNS cache poisoning as an initial attack vector. When users attempt to download updates, the system does not perform cryptographic verification or source authentication checks on the downloaded files, allowing attackers to substitute legitimate update packages with malicious ones. This flaw enables attackers to redirect users through poisoned DNS records to malicious sites that serve crafted update files containing arbitrary PHP code. The vulnerability essentially transforms the update mechanism from a security enhancement into a potential attack surface, where the very process designed to protect systems becomes a vector for compromise.
From an operational impact perspective, this vulnerability creates a significant risk landscape for organizations using Bitrix Site Manager 4.1.x, as it allows attackers to execute arbitrary code on affected systems with the privileges of the web server process. The potential for sensitive information disclosure through this attack vector means that attackers could access database credentials, user information, and other confidential data stored within the application. The attack requires minimal sophistication beyond DNS manipulation and can be automated, making it particularly dangerous for widespread deployment. This vulnerability directly impacts the CIA triad by compromising confidentiality through information disclosure, integrity through unauthorized code execution, and availability through potential system compromise.
The vulnerability aligns with CWE-22, which addresses improper limitation of a pathname to a restricted directory, and CWE-20, which covers improper input validation. It also maps to ATT&CK technique T1190, representing the exploitation of vulnerabilities in software update mechanisms, and T1059, covering the execution of malicious code through PHP scripts. Organizations should implement immediate mitigations including network-level DNS filtering, implementation of proper update signature verification, and deployment of web application firewalls to monitor and block suspicious update traffic. The most effective long-term solution involves upgrading to patched versions of Bitrix Site Manager and implementing comprehensive network security controls that prevent DNS cache poisoning attacks. Additionally, organizations should conduct thorough security assessments of their update mechanisms and establish proper code signing practices to ensure that only authenticated and verified updates are processed by the system.