CVE-2015-0845 in Type
Summary
by MITRE
Format string vulnerability in Movable Type Pro, Open Source, and Advanced before 5.2.13 and Pro and Advanced 6.0.x before 6.0.8 allows remote attackers to execute arbitrary code via vectors related to localization of templates.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/02/2024
The vulnerability identified as CVE-2015-0845 represents a critical format string vulnerability affecting Movable Type content management systems across multiple versions. This flaw exists within the localization handling mechanisms of the software, specifically in how template strings are processed and formatted during internationalization operations. The vulnerability impacts both the open source and commercial variants of Movable Type, with affected versions including all releases prior to 5.2.13 for the 5.x series and 6.0.x versions before 6.0.8. The issue stems from improper input validation and sanitization within the template localization subsystem where user-controllable data is directly incorporated into format string operations without adequate escaping or validation.
The technical exploitation of this vulnerability occurs through carefully crafted input that manipulates the format string parsing mechanism. When the application processes localized template strings, it fails to properly sanitize user-supplied data that may contain format specifiers such as %s, %d, or other formatting directives. Attackers can leverage this weakness by submitting malicious input through template parameters or localization data that, when processed by the vulnerable format string functions, can lead to stack-based buffer overflows, memory corruption, or arbitrary code execution. This type of vulnerability falls under CWE-134 which specifically addresses the use of format strings with user-supplied data without proper validation. The vulnerability is particularly dangerous because it allows remote code execution without requiring authentication, making it an attractive target for attackers seeking to compromise web servers running affected versions of Movable Type.
The operational impact of CVE-2015-0845 extends beyond simple code execution to encompass complete system compromise and potential data breaches. Remote attackers who successfully exploit this vulnerability can gain unauthorized access to web servers hosting Movable Type applications, potentially leading to full system control, data exfiltration, or the installation of persistent backdoors. The vulnerability affects not just individual websites but entire server infrastructures, as Movable Type installations often serve as content management platforms for high-value web properties. Organizations running affected versions face significant risk of compromise, especially if they have not implemented proper network segmentation or intrusion detection measures. The vulnerability also has implications for supply chain security, as compromised Movable Type installations could be used as launching points for attacks against other systems within the same network infrastructure.
Mitigation strategies for CVE-2015-0845 primarily focus on immediate version updates and input validation improvements. The most effective solution involves upgrading to patched versions of Movable Type, specifically versions 5.2.13 or later for the 5.x series and 6.0.8 or later for the 6.0.x series. Organizations should also implement strict input validation measures that sanitize all user-supplied data before processing, particularly within template localization contexts. Network-based mitigations include implementing web application firewalls that can detect and block suspicious format string patterns in HTTP requests. Additionally, system administrators should consider disabling unnecessary template localization features or implementing proper access controls to limit who can modify template content. The vulnerability's classification under ATT&CK technique T1059.007 (Command and Scripting Interpreter: PowerShell) and T1190 (Exploit Public-Facing Application) highlights the need for comprehensive security monitoring and incident response capabilities. Security teams should also conduct thorough vulnerability assessments to identify any other applications or systems that may be vulnerable to similar format string issues, ensuring that proper code review processes are implemented to prevent similar weaknesses in future development cycles.