CVE-2018-1000663 in Jsish
Summary
by MITRE
jsish version 2.4.70 2.047 contains a Buffer Overflow vulnerability in function _jsi_evalcode from jsiEval.c that can result in Crash due to segmentation fault. This attack appear to be exploitable via The victim must execute crafted javascript code.
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Analysis
by VulDB Data Team • 03/21/2020
The vulnerability identified as CVE-2018-1000663 represents a critical buffer overflow flaw within the jsish JavaScript interpreter version 2.4.70 and 2.047. This security weakness resides in the _jsi_evalcode function located in the jsiEval.c source file, fundamentally compromising the interpreter's memory management capabilities. The flaw manifests when the interpreter processes maliciously crafted JavaScript code, leading to unauthorized memory access patterns that ultimately result in segmentation faults and system crashes.
This buffer overflow vulnerability operates through a classic memory corruption attack vector where insufficient input validation allows an attacker to write beyond allocated memory boundaries. The specific function _jsi_evalcode demonstrates poor boundary checking mechanisms when handling JavaScript code evaluation, enabling attackers to overflow buffers and overwrite adjacent memory regions. The vulnerability's exploitability requires user interaction, specifically requiring victims to execute the crafted JavaScript payload, making it particularly dangerous in web-based environments where users may unknowingly execute malicious scripts.
The operational impact of this vulnerability extends beyond simple system crashes, potentially enabling more sophisticated attacks depending on the execution environment. When a segmentation fault occurs due to buffer overflow, the interpreter process terminates abruptly, causing denial of service conditions that can disrupt legitimate user operations. The vulnerability's classification aligns with CWE-121, which describes stack-based buffer overflow conditions, and may also relate to CWE-787, representing out-of-bounds write conditions. From an adversarial perspective, this flaw could potentially be leveraged for privilege escalation or code execution if attackers can control the memory layout or if additional vulnerabilities exist within the interpreter's architecture.
The attack surface for CVE-2018-1000663 is primarily web-based execution environments where jsish is embedded or used as a JavaScript interpreter. This includes web applications, server-side JavaScript environments, and embedded systems utilizing jsish for scripting capabilities. The vulnerability's exploitation pathway follows ATT&CK technique T1059.007, which covers JavaScript and VBScript execution, making it particularly relevant for threat actors targeting web-based applications or environments that rely on JavaScript interpreters. Organizations using jsish in production environments face significant risk of service disruption and potential data exposure if attackers successfully exploit this vulnerability.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected jsish versions to address the buffer overflow in _jsi_evalcode function. System administrators should implement input validation controls and sandboxing mechanisms to limit the impact of potentially malicious JavaScript code execution. Additionally, monitoring for unusual JavaScript execution patterns and implementing web application firewalls can provide additional layers of defense. The vulnerability's remediation aligns with standard security practices for buffer overflow prevention, including bounds checking implementation, use of safe string handling functions, and regular security updates to prevent exploitation through memory corruption attacks.