CVE-2011-3579 in Mail Server
Summary
by MITRE
server/webmail.php in IceWarp WebMail in IceWarp Mail Server before 10.3.3 allows remote attackers to read arbitrary files, and possibly send HTTP requests to intranet servers or cause a denial of service (CPU and memory consumption), via an XML external entity declaration in conjunction with an entity reference.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 12/19/2024
The vulnerability identified as CVE-2011-3579 represents a critical security flaw in the IceWarp WebMail component of the IceWarp Mail Server software. This issue affects versions prior to 10.3.3 and exposes the system to multiple attack vectors through improper handling of XML external entity declarations. The vulnerability exists within the server/webmail.php file, which processes incoming XML data without adequate sanitization or validation mechanisms. Attackers can exploit this weakness to perform unauthorized file access operations, potentially gaining access to sensitive system files and data that should remain protected. The flaw enables remote attackers to manipulate the XML parsing process and leverage entity references to execute malicious commands.
The technical exploitation of this vulnerability follows the classic XML External Entity (XXE) attack pattern, which is categorized under CWE-611 in the Common Weakness Enumeration system. This type of vulnerability occurs when an application processes untrusted XML data that contains external entity declarations without proper restrictions or validation. The attack allows adversaries to reference external resources and potentially access local files through the web server's file system. The specific implementation in IceWarp WebMail fails to properly validate or restrict XML entities, creating a pathway for attackers to manipulate the application's behavior. The vulnerability also enables potential denial of service attacks by consuming excessive CPU and memory resources through crafted XML payloads.
The operational impact of CVE-2011-3579 extends beyond simple unauthorized file access to include significant security and operational risks. Remote attackers can potentially send HTTP requests to internal intranet servers, effectively using the compromised webmail system as a proxy to access internal network resources that should remain isolated from external threats. This capability allows for internal network reconnaissance and further exploitation attempts, as the compromised system becomes an entry point for attackers to move laterally within the network infrastructure. The denial of service component of this vulnerability can cause substantial system instability, as excessive resource consumption can overwhelm the web server and potentially impact legitimate user access to the mail service.
Security professionals should note that this vulnerability aligns with several techniques documented in the MITRE ATT&CK framework, particularly those related to initial access through web application attacks and privilege escalation via system access. The attack vector involves exploiting a web application vulnerability to gain unauthorized access to system resources, which can then be leveraged for further compromise. Organizations should implement immediate mitigations including updating to IceWarp Mail Server version 10.3.3 or later, which contains the necessary patches to address this XXE vulnerability. Additionally, network segmentation and firewall rules should be implemented to limit access to the affected webmail service, while proper input validation and XML parser configuration should be enforced to prevent similar vulnerabilities in other applications.
The remediation approach should focus on both immediate patching and long-term architectural improvements to prevent similar XXE vulnerabilities. Organizations must ensure that all XML processing components properly configure parsers to disable external entity resolution and DTD processing. The vulnerability demonstrates the importance of proper input validation and the principle of least privilege in web application security. Regular security assessments and vulnerability scanning should include checks for XXE vulnerabilities across all XML processing components within the organization's infrastructure. This particular vulnerability serves as a reminder of the critical need for maintaining up-to-date software versions and implementing comprehensive security controls to protect against known attack patterns that have been documented in security databases and frameworks.