CVE-2020-6063 in ImageGear
Summary
by MITRE
An exploitable out-of-bounds write vulnerability exists in the uncompress_scan_line function of the igcore19d.dll library of Accusoft ImageGear, version 19.5.0. A specially crafted PCX file can cause an out-of-bounds write, resulting in a remote code execution. An attacker needs to provide a malformed file to the victim to trigger the vulnerability.
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Analysis
by VulDB Data Team • 03/30/2024
The vulnerability identified as CVE-2020-6063 represents a critical security flaw within the Accusoft ImageGear software suite, specifically within the igcore19d.dll library version 19.5.0. This issue manifests as an exploitable out-of-bounds write condition that can be triggered through manipulation of PCX image files, creating a significant risk for remote code execution. The vulnerability stems from inadequate input validation and memory management within the image decompression routine, particularly affecting the uncompress_scan_line function that processes compressed image data during file parsing operations.
The technical root cause of this vulnerability lies in the improper handling of image data structures during decompression processes, where the uncompress_scan_line function fails to properly validate buffer boundaries before writing decompressed data. This flaw allows an attacker to craft a malicious PCX file that, when processed by the vulnerable software, causes memory corruption through unauthorized writes beyond allocated buffer limits. The vulnerability aligns with CWE-787, which specifically addresses out-of-bounds write conditions, and demonstrates characteristics consistent with memory corruption vulnerabilities that can be leveraged for privilege escalation and arbitrary code execution. The attack vector requires only that a victim open or process the specially crafted PCX file, making this a particularly dangerous flaw for remote exploitation scenarios.
The operational impact of CVE-2020-6063 extends beyond simple data corruption, as it provides attackers with potential remote code execution capabilities that can be exploited across various attack surfaces. This vulnerability affects systems running Accusoft ImageGear 19.5.0, which is commonly deployed in enterprise environments for image processing and document management applications. The threat landscape for this vulnerability is particularly concerning as it can be weaponized through social engineering campaigns targeting users who may unknowingly open malicious image files, or through automated exploitation mechanisms that can scan for vulnerable systems. The ATT&CK framework categorizes this vulnerability under T1203 - Exploitation for Client Execution, where attackers leverage application vulnerabilities to execute malicious code in the context of the target application.
Mitigation strategies for this vulnerability should include immediate patching of the affected Accusoft ImageGear software to version 19.6.0 or later, which contains the necessary fixes for the memory handling issues. Organizations should also implement network-based controls such as file type filtering and content validation for PCX files, particularly in environments where users may encounter untrusted image content. Additional defensive measures include restricting user privileges when processing image files, implementing application whitelisting policies, and conducting regular vulnerability assessments to identify other potentially affected software components. The remediation process should also include monitoring for suspicious file access patterns and implementing security awareness training to reduce the risk of successful social engineering attacks that might exploit this vulnerability.