Service interruption via XML entity expansion
Published Dec 7, 2023 · Updated Aug 28, 2024
XML entity expansion in Typecho 1.2.1 allows remote attackers to interrupt service through a crafted request to its XML-RPC endpoint. The /index.php/action/xmlrpc handler processes a DTD defining a large entity and repeatedly expands references embedded in the methodName value, consuming disproportionate resources. No authentication or user interaction is required; the documented consequence is denial of service, not data disclosure or modification.
Summary
What happened
XML entity expansion in Typecho 1.2.1 allows remote attackers to interrupt service through a crafted request to its XML-RPC endpoint. The /index.php/action/xmlrpc handler processes a DTD defining a large entity and repeatedly expands references embedded in the methodName value, consuming disproportionate resources. No authentication or user interaction is required; the documented consequence is denial of service, not data disclosure or modification.
The record
- CVE
- CVE-2023-49967
- Published
- Dec 7, 2023
- Updated
- Aug 28, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-776, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 7, 2023CVE publishedPublication date reported by the CVE source.
- Aug 28, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- XML-RPC quadratic blowup proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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