Controller hang via zero-length Hello element
Published May 5, 2024 · Updated Aug 2, 2024
Infinite-loop denial of service in Faucet SDN Ryu 4.34 allows remote attackers to hang the controller via an OpenFlow Hello message. The OFPHello parser advances its element offset by the untrusted length field, so a zero value leaves the offset unchanged inside the parsing loop. No authentication or completed handshake is required; one crafted message traps the parser and prevents the controller from progressing.
Summary
What happened
Infinite-loop denial of service in Faucet SDN Ryu 4.34 allows remote attackers to hang the controller via an OpenFlow Hello message. The OFPHello parser advances its element offset by the untrusted length field, so a zero value leaves the offset unchanged inside the parsing loop. No authentication or completed handshake is required; one crafted message traps the parser and prevents the controller from progressing.
The record
- CVE
- CVE-2024-34489
- Published
- May 5, 2024
- Updated
- Aug 2, 2024
- Vendor
- Faucet SDN
- Product
- Ryu
- Classifications
- CWE-835, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 5, 2024CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.34
What conditions does exploitation require?
What is affected?
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
- OpenFlow Hello zero-length element proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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