CVE-2007-3231 in MeCab
Summary
by MITRE
Buffer overflow in MeCab before 0.96 has unknown impact and attack vectors.
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Analysis
by VulDB Data Team • 09/04/2018
The vulnerability identified as CVE-2007-3231 represents a critical buffer overflow flaw within the MeCab natural language processing library version 0.96 and earlier. MeCab is a widely-used morphological analyzer and part-of-speech tagger that processes Japanese text and other languages, making it a critical component in various text processing applications, search engines, and language analysis tools. This vulnerability exists in the library's handling of input data, where insufficient bounds checking allows maliciously crafted input to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system instability.
The technical nature of this buffer overflow stems from improper input validation within MeCab's parsing routines, particularly when processing structured text data or configuration files. The vulnerability manifests when the library attempts to store input data in fixed-size buffers without adequate size verification, creating opportunities for attackers to overflow these buffers and overwrite critical memory segments including return addresses, function pointers, or other control data. This flaw operates at the application level and can be exploited through various attack vectors including malformed input files, command-line arguments, or network-based data processing scenarios where MeCab is invoked as a processing component.
The operational impact of CVE-2007-3231 extends beyond simple system crashes, as this vulnerability can enable remote code execution when MeCab is used in web applications or services that process untrusted input data. Systems utilizing MeCab for text analysis, search functionality, or automated content processing are particularly at risk, especially when these systems are exposed to external data sources or user-generated content. The attack surface expands when MeCab is integrated into larger applications such as web servers, content management systems, or enterprise search platforms, where exploitation could lead to complete system compromise or data breaches. The unknown nature of the specific impact and attack vectors in the original CVE description suggests that multiple exploitation pathways may exist, potentially including local privilege escalation scenarios or denial-of-service conditions that could disrupt critical services.
Mitigation strategies for this vulnerability require immediate patching of MeCab installations to version 0.96 or later, which contains the necessary buffer overflow protections and input validation improvements. Organizations should implement comprehensive input sanitization measures when processing external data through MeCab, including strict validation of input formats and size limits. System hardening techniques such as stack canaries, address space layout randomization, and non-executable stack protections should be enabled to reduce exploitability even if the underlying vulnerability remains unpatched. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and may map to ATT&CK technique T1059 for command and control through compromised systems. Regular security assessments and vulnerability scanning should include checks for outdated MeCab installations, particularly in environments where the library is used for processing untrusted data inputs. Network segmentation and access controls should be implemented to limit exposure of systems running MeCab to potentially malicious input sources, while maintaining audit logging to detect potential exploitation attempts.