CVE-2017-17478 in PEGA Platform
Summary
by MITRE
An XSS issue was discovered in Designer Studio in Pegasystems Pega Platform 7.1.7, 7.1.8, 7.1.9, 7.1.10, 7.2, 7.2.1, and 7.2.2. A user with developer credentials can insert malicious code (up to 64 characters) into a text field in Designer Studio, after establishing context. Designer Studio is the developer workbench for Pega Platform. That XSS payload will execute when other developers visit the affected pages.
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Analysis
by VulDB Data Team • 01/09/2020
The vulnerability identified as CVE-2017-17478 represents a cross-site scripting flaw within Pegasystems Pega Platform's Designer Studio component, affecting versions 7.1.7 through 7.2.2. This issue resides in the web application's input validation mechanisms where insufficient sanitization allows malicious code injection into text fields. The vulnerability specifically targets the developer workbench environment where authorized users with developer credentials can exploit this weakness by inserting malicious payloads of up to 64 characters into designated text fields. The flaw demonstrates a classic server-side input validation failure that enables persistent cross-site scripting attacks, aligning with CWE-79 which categorizes cross-site scripting vulnerabilities as a critical web application security concern.
The technical execution of this vulnerability requires a malicious user with legitimate developer credentials to establish context within the Designer Studio environment and then insert the crafted payload into a text field. Once inserted, the malicious code becomes persistent within the application's data storage and executes automatically when other developers navigate to the affected pages. This type of attack leverages the trust relationship between the application and its users, as the malicious code originates from a legitimate developer account and executes within the context of other authenticated users. The limited payload size restriction of 64 characters suggests that attackers must carefully craft their malicious scripts to maximize impact within these constraints, potentially using techniques such as base64 encoding or obfuscated javascript to deliver their payload effectively.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it enables attackers to compromise the development environment and potentially gain access to sensitive application logic, configuration details, and source code. Since Designer Studio serves as the primary development interface for Pega Platform, successful exploitation could provide attackers with insights into application architecture, business logic, and security controls that are typically restricted to authorized developers. This vulnerability creates a persistent threat vector that remains active until patched, as the malicious payloads can execute in the context of other legitimate users, potentially enabling further attacks such as credential theft, privilege escalation, or data manipulation within the development environment. The attack surface is particularly concerning given that the vulnerability affects multiple versions of the platform, suggesting it may have been present for an extended period and could have been exploited by threat actors who gained access to developer accounts.
Mitigation strategies for CVE-2017-17478 should focus on immediate patching of affected Pega Platform versions to address the input validation weakness in Designer Studio. Organizations should implement comprehensive input sanitization measures, including HTML escaping and content security policy enforcement, to prevent malicious code execution in text fields. Additionally, privilege separation should be enforced to limit the scope of potential impact, ensuring that developer credentials are properly managed and that least privilege principles are applied to access controls. Network segmentation and monitoring of developer workbench activities can provide early detection of suspicious behavior patterns. The vulnerability's classification under CWE-79 and potential mapping to ATT&CK technique T1059.007 (Scripting) highlights the importance of implementing robust application security controls including regular security testing, input validation, and output encoding to prevent similar vulnerabilities from persisting in the application codebase. Organizations should also conduct thorough security reviews of all developer-facing interfaces to identify and remediate similar input validation weaknesses that could enable similar attacks.