CVE-2017-8803 in Notepad++
Summary
by MITRE
Notepad++ 7.3.3 (32-bit) with Hex Editor Plugin v0.9.5 might allow user-assisted attackers to execute code via a crafted file, because of a "Data from Faulting Address controls Code Flow" issue. One threat model is a victim who obtains an untrusted crafted file from a remote location and issues several user-defined commands.
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Analysis
by VulDB Data Team • 10/22/2019
The vulnerability identified as CVE-2017-8803 affects Notepad++ version 7.3.3 when used with the Hex Editor Plugin version 0.9.5, representing a critical security flaw that enables remote code execution through crafted file manipulation. This vulnerability stems from a data flow issue where input data from a faulting address directly influences code execution flow, creating a pathway for malicious actors to exploit the application's processing mechanisms. The flaw specifically manifests within the Hex Editor plugin's handling of malformed or specially crafted files, making it particularly dangerous in environments where users frequently open files from untrusted sources.
The technical implementation of this vulnerability involves a classic buffer overflow or memory corruption scenario where the application fails to properly validate input data during file processing. When Notepad++ attempts to parse a maliciously crafted file through the Hex Editor plugin, the faulting address contains data that can be manipulated to overwrite critical execution pointers or jump tables within the application's memory space. This type of vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write operations that can lead to arbitrary code execution. The vulnerability operates under the principle that user-supplied data is not adequately sanitized before being processed, allowing attackers to craft inputs that cause the application to execute unintended code sequences.
From an operational perspective, this vulnerability creates a significant threat vector for attackers who can leverage social engineering tactics to deliver malicious files to unsuspecting victims. The threat model assumes a victim who downloads and opens an untrusted file from a remote location, potentially through email attachments, compromised websites, or file sharing platforms. Once the victim opens the crafted file, the Hex Editor plugin's processing routine triggers the vulnerability, allowing the attacker to execute arbitrary code on the victim's system with the privileges of the Notepad++ process. This scenario represents a typical user-assisted attack where the attacker requires minimal technical expertise to compromise systems, as the vulnerability is triggered through normal application usage patterns.
The attack surface for CVE-2017-8803 extends beyond simple file execution to include potential privilege escalation and lateral movement within compromised networks. Since Notepad++ typically runs with user-level privileges, successful exploitation could lead to information disclosure, system compromise, or further attack vectors against other network resources. The vulnerability's impact is amplified by the widespread use of Notepad++ across enterprise environments and individual workstations, making it an attractive target for attackers seeking to establish persistent access or conduct more extensive operations. Organizations should consider implementing security controls such as application whitelisting, network segmentation, and user education programs to mitigate the risk of exploitation. The ATT&CK framework categorizes this vulnerability under T1059 for command and scripting interpreter and T1078 for valid accounts, as exploitation typically involves legitimate user interactions with compromised applications. Remediation efforts must include immediate patching of the Hex Editor plugin to version 0.9.6 or later, along with comprehensive security assessments of all systems running vulnerable versions of Notepad++.