CVE-2020-28062 in HisiPHP
Summary
by MITRE • 04/04/2022
An Access Control vulnerability exists in HisiPHP 2.0.11 via special packets that are constructed in $files = Dir::getList($decompath. '/ Upload/Plugins /, which could let a remote malicious user execute arbitrary code.
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Analysis
by VulDB Data Team • 04/06/2022
The vulnerability identified as CVE-2020-28062 represents a critical access control flaw within HisiPHP version 2.0.11 that enables remote code execution through improper input validation. This vulnerability stems from insufficient sanitization of user-supplied data within the Dir::getList() function, specifically when processing paths containing the string '/Upload/Plugins/'. The flaw occurs when the application constructs special packet structures that bypass normal access controls, allowing attackers to manipulate file system operations and execute arbitrary code on the affected server.
The technical exploitation of this vulnerability involves crafting malicious requests that manipulate the decompath parameter passed to the Dir::getList() function. When the application processes these crafted inputs, it fails to properly validate or sanitize the directory traversal components, creating an opportunity for attackers to navigate beyond intended directories and access restricted system resources. This type of vulnerability falls under CWE-22, known as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", which is classified as a common weakness in software security practices. The vulnerability essentially allows attackers to perform directory traversal attacks that can lead to complete system compromise.
From an operational impact perspective, this vulnerability presents a severe threat to organizations using HisiPHP 2.0.11 as it enables remote attackers to execute arbitrary code without authentication. Attackers can leverage this flaw to upload malicious files, gain shell access, escalate privileges, and potentially establish persistent backdoors within the affected systems. The vulnerability's remote nature means that attackers do not require physical access or prior credentials to exploit the flaw, making it particularly dangerous in web-facing applications. This type of vulnerability aligns with ATT&CK technique T1059.007, which describes "Command and Scripting Interpreter: PowerShell", as the remote code execution capability can be leveraged to execute PowerShell commands or other system-level operations.
The mitigation strategies for CVE-2020-28062 should focus on implementing proper input validation and sanitization mechanisms within the Dir::getList() function. Organizations should immediately update to the latest version of HisiPHP where this vulnerability has been patched, or implement temporary workarounds such as restricting file upload permissions and implementing proper path validation. Additionally, network segmentation and web application firewalls should be deployed to monitor and block suspicious traffic patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of following secure coding practices and implementing defense-in-depth strategies to prevent path traversal attacks that can lead to complete system compromise.