CVE-2020-8020 in open-build-service
Summary
by MITRE
A Improper Neutralization of Input During Web Page Generation vulnerability in open-build-service allows remote attackers to store arbitrary JS code to cause XSS. This issue affects: openSUSE open-build-service versions prior to 7cc32c8e2ff7290698e101d9a80a9dc29a5500fb.
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Analysis
by VulDB Data Team • 10/18/2020
The CVE-2020-8020 vulnerability represents a critical improper neutralization of input during web page generation flaw within the open-build-service platform. This vulnerability falls under the CWE-79 category, which specifically addresses cross-site scripting vulnerabilities arising from inadequate input sanitization during web content generation. The flaw exists in the web application's handling of user-supplied data that is subsequently rendered in HTML output without proper validation and sanitization mechanisms. Attackers can exploit this weakness by injecting malicious javascript code into input fields that are later processed and displayed in web pages, creating a persistent cross-site scripting vector.
The technical implementation of this vulnerability stems from insufficient sanitization of user inputs within the open-build-service's web interface. When users submit data through various forms or input fields, the application fails to properly escape or validate special characters that could be interpreted as executable javascript code. This weakness allows remote attackers to store malicious javascript payloads that persist in the application's database or storage mechanisms. The vulnerability specifically affects openSUSE open-build-service versions prior to the commit hash 7cc32c8e2ff7290698e101d9a80a9dc29a5500fb, indicating that the fix was implemented through a targeted code modification addressing the input validation and sanitization routines.
The operational impact of this vulnerability is significant as it enables remote attackers to execute arbitrary javascript code within the context of other users' browsers. This allows for session hijacking, credential theft, data exfiltration, and potential privilege escalation within the application environment. The stored nature of the vulnerability means that malicious payloads can affect multiple users over time, making it particularly dangerous for collaborative development platforms where multiple users interact with shared resources. Attackers could leverage this vulnerability to gain unauthorized access to build configurations, source code repositories, or other sensitive data managed through the open-build-service platform.
Mitigation strategies for CVE-2020-8020 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's web interface. Organizations should immediately upgrade to open-build-service version 7cc32c8e2ff7290698e101d9a80a9dc29a5500fb or later to receive the patched input sanitization routines. Additionally, implementing proper content security policies, utilizing secure coding practices for input handling, and deploying web application firewalls can provide additional layers of protection. The vulnerability's classification under ATT&CK technique T1213.002 (Data from Information Repositories) and T1566.001 (Phishing) highlights the need for comprehensive security monitoring and user education to prevent exploitation of such persistent cross-site scripting vulnerabilities in development environments.