CVE-2020-7872 in DaviewIndy
Summary
by MITRE • 07/12/2021
DaviewIndy v8.98.7.0 and earlier versions have a Integer overflow vulnerability, triggered when the user opens a malformed format file that is mishandled by DaviewIndy. Attackers could exploit this and arbitrary code execution.
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Analysis
by VulDB Data Team • 07/15/2021
The DaviewIndy software presents a critical integer overflow vulnerability that affects versions 8.98.7.0 and earlier, constituting a significant security risk for users of this document viewing application. This vulnerability stems from inadequate input validation within the file parsing mechanism, specifically when processing malformed format files that do not conform to expected data structures. The flaw manifests during the file opening process when the application attempts to handle oversized or malformed numerical values that exceed the capacity of the integer data types used in the parsing logic.
The technical exploitation of this vulnerability occurs through a carefully crafted malicious file that triggers an integer overflow condition within the DaviewIndy application. When the software processes such a malformed file, the integer overflow causes the application to allocate insufficient memory or perform incorrect calculations, leading to memory corruption that can be leveraged by attackers to execute arbitrary code with the privileges of the affected user. This type of vulnerability falls under CWE-190, Integer Overflow or Wraparound, which represents a well-documented class of flaws where arithmetic operations produce results that exceed the maximum value representable by the data type. The vulnerability directly aligns with ATT&CK technique T1203, Exploitation for Client Execution, as it enables attackers to gain code execution on the target system through client-side exploitation.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a potential foothold for further compromise within the target environment. An attacker who successfully exploits this vulnerability could gain full control over the affected system, potentially leading to data theft, lateral movement, or establishment of persistent access. The vulnerability is particularly concerning because it requires no special privileges to exploit, making it accessible to any user who might open a malicious file, and it can be delivered through various attack vectors including email attachments, malicious websites, or compromised documents. The integer overflow condition creates a predictable pattern of memory corruption that allows for reliable exploitation, making this vulnerability particularly dangerous in enterprise environments where users may encounter untrusted documents.
Mitigation strategies for this vulnerability primarily focus on immediate remediation through software updates and patches provided by the vendor, as well as implementing defensive measures to prevent users from encountering malicious files. Organizations should prioritize updating to the latest version of DaviewIndy that addresses this specific integer overflow vulnerability, which would typically include proper input validation and bounds checking mechanisms. Additionally, implementing application whitelisting policies, restricting file execution permissions, and deploying sandboxing solutions can help reduce the attack surface and limit the potential impact of successful exploitation attempts. Network-based defenses such as intrusion prevention systems and email filtering solutions should also be configured to detect and block known malicious file patterns associated with this vulnerability, while user education regarding safe browsing practices and file handling procedures remains essential for comprehensive protection against social engineering attacks that might deliver malicious files to unsuspecting users.