CVE-2024-49193
📋 TL;DR
This vulnerability in Zendesk allows attackers to read private ticket history by spoofing email addresses. Attackers can exploit insufficient email spoofing detection and predictable support email addresses to gain unauthorized access to ticket information. All Zendesk customers using versions before the July 2024 patch are affected.
💻 Affected Systems
- Zendesk Support
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete exposure of all ticket histories containing sensitive customer data, financial information, or confidential business communications to unauthorized external actors.
Likely Case
Unauthorized access to ticket histories containing customer support conversations, potentially exposing PII, business processes, or sensitive customer issues.
If Mitigated
Limited exposure of non-sensitive ticket metadata or failed exploitation attempts due to enhanced email validation.
🎯 Exploit Status
Exploitation requires only email spoofing capabilities and knowledge of predictable support email patterns. Public proof-of-concept demonstrates the attack methodology.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions from 2024-07-02 onward
Vendor Advisory: https://support.zendesk.com/hc/en-us/articles/
Restart Required: No
Instructions:
1. Log into Zendesk admin panel. 2. Navigate to Settings > Account. 3. Ensure your instance is running version dated 2024-07-02 or later. 4. No restart required as fixes are applied automatically by Zendesk.
🔧 Temporary Workarounds
Disable email-based ticket creation
allTemporarily disable ticket creation via email to prevent exploitation
Enable strict email validation
allConfigure Zendesk to use stricter email validation and SPF/DKIM/DMARC checks
🧯 If You Can't Patch
- Monitor all ticket access logs for unusual patterns, especially email-based access from unexpected domains
- Implement additional email security controls at the organizational level including strict SPF, DKIM, and DMARC policies
🔍 How to Verify
Check if Vulnerable:
Check your Zendesk instance version date in admin settings. If before 2024-07-02, you are vulnerable.Check Version:
Not applicable - check via Zendesk web admin interface under Settings > AccountVerify Fix Applied:
Confirm your Zendesk instance shows version date 2024-07-02 or later in admin settings.📡 Detection & Monitoring
Log Indicators:
- Unusual ticket access from email addresses not associated with the ticket
- Multiple failed email validation attempts
- Ticket views from unexpected domains via email links
Network Indicators:
- Incoming emails with spoofed headers attempting to access tickets
- Email traffic patterns showing attempts to predict support email addresses
SIEM Query:
source="zendesk" AND (event="ticket_view" AND user_email NOT IN allowed_domains) OR (event="email_validation_failed" AND count>threshold)