CVE-2017-11330 in DivFix++
Summary
by MITRE
The DivFixppCore::avi_header_fix function in DivFix++Core.cpp in DivFix++ v0.34 allows remote attackers to cause a denial of service (invalid memory write and application crash) via a crafted avi file.
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Analysis
by VulDB Data Team • 12/01/2024
The vulnerability identified as CVE-2017-11330 resides within the DivFix++ media file repair utility version 0.34, specifically within the DivFixppCore::avi_header_fix function located in the DivFix++Core.cpp source file. This flaw represents a classic buffer overflow condition that occurs when processing malformed Advanced Video Interleave avi files, demonstrating a critical weakness in input validation and memory management within the application's core processing logic. The vulnerability is particularly concerning as it allows remote attackers to exploit the software through crafted malicious avi files, making it a significant threat vector for unauthorized system disruption.
The technical implementation of this vulnerability stems from insufficient bounds checking and memory allocation validation within the avi header processing routine. When DivFix++ encounters a specially crafted avi file, the DivFixppCore::avi_header_fix function attempts to write data to memory locations without proper validation of the input file structure, resulting in invalid memory writes that corrupt application memory and ultimately lead to application crashes. This type of flaw aligns with CWE-787, which describes out-of-bounds writes, and represents a fundamental failure in defensive programming practices where input data is not adequately sanitized before processing. The vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous as it can be triggered through simple file manipulation.
The operational impact of CVE-2017-11330 extends beyond simple denial of service, as it can be leveraged by attackers to disrupt legitimate file repair operations and potentially escalate to more sophisticated attacks. An attacker could deliver a malicious avi file through various vectors including email attachments, file sharing platforms, or compromised websites, causing unsuspecting users to experience application crashes when attempting to repair or preview the files. This vulnerability directly maps to ATT&CK technique T1203, which involves exploitation of software vulnerabilities for denial of service, and can be used as a stepping stone for more advanced persistent threats. The impact is particularly severe in enterprise environments where file repair utilities are frequently used for media processing and digital asset management.
Mitigation strategies for this vulnerability should focus on immediate patching of the DivFix++ application to version 0.35 or later, which contains the necessary code fixes to address the buffer overflow conditions. Organizations should implement strict file validation procedures and employ sandboxing techniques when processing potentially malicious media files. Network administrators should consider implementing file type restrictions and content filtering to prevent the delivery of suspicious avi files to end-user systems. The vulnerability also underscores the importance of input validation and memory safety practices in software development, emphasizing the need for comprehensive testing including fuzzing and static analysis to identify similar issues in other applications. Security teams should monitor for exploitation attempts and implement appropriate network intrusion detection signatures to identify potential attacks targeting this specific vulnerability.