CVE-2017-15797 in IrfanView
Summary
by MITRE
IrfanView version 4.50 (64bit) allows attackers to execute arbitrary code or cause a denial of service via a crafted .dll file that is mishandled during an attempt to render the DLL icon, related to a "Read Access Violation on Block Data Move starting at TOOLS!IVLoadImage_W+0x00000000000020b9."
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Analysis
by VulDB Data Team • 01/19/2021
This vulnerability exists in IrfanView version 4.50 64bit where the application fails to properly validate crafted dll files during icon rendering processes. The flaw manifests as a read access violation occurring during a block data move operation within the IVLoadImage_W function at offset 0x20b9 in the TOOLS module. This represents a classic buffer overflow condition that can be exploited by malicious actors to execute arbitrary code or induce denial of service. The vulnerability stems from insufficient input validation when processing dynamic link libraries that are intended for icon display purposes, creating an opportunity for attackers to manipulate memory operations through specially crafted malicious files.
The technical implementation of this vulnerability involves the application's failure to properly handle memory allocation and data movement when attempting to load and display icons from external dll files. During the icon rendering process, the application performs a block data move operation that accesses memory locations without proper bounds checking, leading to a read access violation. This type of flaw falls under the common weakness enumeration CWE-125 which describes out-of-bounds read conditions, and specifically relates to improper input validation and memory management errors. The attack vector requires an attacker to convince a victim to open a maliciously crafted dll file through IrfanView's file handling mechanism, which then triggers the vulnerable code path during icon processing.
The operational impact of this vulnerability extends beyond simple code execution to include potential system compromise and service disruption. When exploited successfully, attackers can gain arbitrary code execution privileges within the context of the IrfanView process, potentially allowing them to escalate privileges, access sensitive system resources, or install malware. The denial of service component means that legitimate users may experience application crashes or system instability when encountering malicious files, disrupting normal workflow operations. This vulnerability affects users who frequently process files from untrusted sources or those who may inadvertently open compromised dll files, making it particularly dangerous in enterprise environments where file processing is common.
Mitigation strategies for this vulnerability should focus on immediate patching and process hardening measures. Users must update to the latest version of IrfanView where this vulnerability has been addressed through proper input validation and memory management. System administrators should implement file type restrictions and sandboxing measures to prevent automatic execution of dll files through IrfanView. Network-level controls including content filtering and file scanning can help prevent malicious dll files from reaching end-user systems. Additionally, implementing the principle of least privilege and restricting file processing capabilities can minimize the potential impact if exploitation occurs. This vulnerability aligns with ATT&CK technique T1059 which covers command and scripting interpreter usage, and T1203 which addresses exploitation for arbitrary code execution, highlighting the need for comprehensive defensive measures across multiple security domains.