CVE-2008-1226 in Zimbra Collaboration Suite
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Zimbra Collaboration Suite (ZCS) 4.0.3, 4.5.6, and possibly other versions before 4.5.10 allow remote attackers to inject arbitrary web script or HTML via an e-mail attachment, possibly involving a (1) .jpg or (2) .gif image attachment.
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Analysis
by VulDB Data Team • 05/10/2018
The vulnerability identified as CVE-2008-1226 represents a critical cross-site scripting flaw affecting the Zimbra Collaboration Suite versions 4.0.3 through 4.5.6, with potential impacts extending to earlier releases. This security weakness resides within the email attachment handling mechanisms of the collaboration platform, specifically targeting the processing of image file types that are commonly used for email attachments. The vulnerability manifests when the system fails to properly sanitize or validate file names and content associated with image attachments, creating opportunities for malicious actors to exploit this weakness through crafted email messages.
The technical exploitation of this vulnerability occurs through the manipulation of image file extensions such as .jpg and .gif, which are typically considered safe for email transmission. Attackers can craft malicious email attachments that appear legitimate but contain embedded script code within the image metadata or file names themselves. When the vulnerable Zimbra system processes these attachments, it fails to adequately filter or escape the potentially malicious content, allowing the injected scripts to execute within the context of a user's browser session. This processing flaw stems from inadequate input validation and output encoding mechanisms within the email handling components, particularly those responsible for rendering image attachments in web-based interfaces.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform various malicious activities including session hijacking, credential theft, and data exfiltration. Remote attackers can leverage these XSS vulnerabilities to steal user authentication tokens, access sensitive email communications, and potentially escalate privileges within the collaboration environment. The attack surface is particularly concerning given that email attachments are a common vector for social engineering attacks, making the exploitation of this vulnerability highly effective in real-world scenarios. Users who access their email through the web interface are particularly at risk, as the malicious scripts execute in their browser context with the privileges of their authenticated session.
Security professionals should note that this vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications. The attack pattern follows typical XSS exploitation techniques documented in the MITRE ATT&CK framework under the T1059.007 technique for command and scripting interpreter. Organizations should implement immediate mitigations including updating to Zimbra Collaboration Suite version 4.5.10 or later, which contains the necessary patches to address this vulnerability. Additional protective measures include implementing strict email attachment filtering policies, enabling content security policies for web interfaces, and deploying web application firewalls to monitor and block suspicious script injection attempts. Regular security assessments and user education regarding suspicious email attachments remain essential components of comprehensive defense strategies against such vulnerabilities.