CVE-2019-5929 in Garoon
Summary
by MITRE
Cross-site scripting vulnerability in Cybozu Garoon 4.0.0 to 4.6.3 allows remote attackers to inject arbitrary web script or HTML via the application 'Memo'.
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Analysis
by VulDB Data Team • 09/22/2023
The vulnerability identified as CVE-2019-5929 represents a critical cross-site scripting flaw within Cybozu Garoon versions 4.0.0 through 4.6.3. This weakness specifically affects the application's memo functionality, creating a pathway for remote attackers to execute malicious web scripts or HTML code within the context of affected systems. The vulnerability stems from insufficient input validation and output encoding mechanisms within the memo handling component of the Garoon platform, which is commonly used for enterprise collaboration and workflow management.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing script code within the memo application's text fields. When other users view these memo entries, the embedded malicious code executes in their browser context, potentially leading to session hijacking, credential theft, or redirection to malicious websites. This type of vulnerability falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly encode or escape user-supplied data before incorporating it into web pages. The flaw demonstrates a classic lack of proper input sanitization and output encoding practices that are fundamental to preventing XSS attacks.
From an operational impact perspective, this vulnerability poses significant risks to enterprise environments that rely on Cybozu Garoon for internal communications and document management. The memo feature is typically used for sharing information, notes, and collaborative work items, making it a prime target for attackers seeking to compromise user sessions or exfiltrate sensitive corporate data. The remote nature of the attack means that threat actors can exploit this vulnerability from outside the network perimeter, potentially affecting any user who views the malicious memo entries. This vulnerability aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, as attackers could leverage this flaw to deliver malicious payloads through seemingly legitimate memo communications.
Organizations affected by this vulnerability should implement immediate mitigations including applying the vendor-provided patches or updates that address the XSS vulnerability in the memo application. Additionally, administrators should consider implementing Content Security Policy (CSP) headers to limit script execution and strengthen input validation mechanisms. The mitigation strategy should include comprehensive user education about the risks of viewing untrusted content within collaborative applications and regular security assessments of web applications to identify similar input validation weaknesses. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts. The vulnerability highlights the critical importance of maintaining up-to-date security patches and implementing defense-in-depth strategies to protect enterprise collaboration platforms from persistent threats targeting user-facing web interfaces.