Service Location Protocol (SLP) Denial-of-Service
CVE-2023-29552 is a high-severity vulnerability in Smi-s Provider from NetApp, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. CISA added it to the Known Exploited Vulnerabilities catalogue on November 8, 2023, which means attacks have been observed in the wild.
Attackers are already exploiting this vulnerability, according to CISA.
What to do
- Update Esxi to 7.0 or a later version.
- CISA's required action: Apply mitigations per vendor instructions or disable SLP service or port 427/UDP on all systems running on untrusted networks, including those directly connected to the Internet.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| NetApp | Smi-s Provider | Not specified in the record | Not stated |
| SUSE | Manager Server | Not specified in the record | Not stated |
| SUSE | Linux Enterprise Server | 11; 12; 15 | Not stated |
| VMware | Esxi | before 7.0 | 7.0 |
| Service Location Protocol Project | Service Location Protocol | Not specified in the record | Not stated |
Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 3.1 | 7.5 | High | CISA (ADP) |
Official description
The Service Location Protocol (SLP, RFC 2608) allows an unauthenticated, remote attacker to register arbitrary services. This could allow the attacker to use spoofed UDP traffic to conduct a denial-of-service attack with a significant amplification factor.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
Timeline
- CVE record published.
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- Deadline for US federal agencies to remediate, set by CISA.
- CISA published its SSVC assessment (exploitation: active, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- blogs.vmware.com/security/2023/04/vmware-response-to-cve-2023-29552-reflective-denial-of-service-dos-amplific…Third Party Advisory
- security.netapp.com/advisory/ntap-20230426-0001/Third Party Advisory
- cisa.gov/news-events/alerts/2023/04/25/abuse-service-location-protocol-may-lead-dos-attacksThird Party Advisory, US Government Resource
- suse.com/support/kb/doc/?id=000021051Third Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-29552US Government Resource
Technical write-ups (may include proof of concept)
- curesec.com/blog/article/CVE-2023-29552-Service-Location-Protocol-Denial-of-Service-Amplification-Attack-212…Exploit, Third Party Advisory
- bitsight.com/blog/new-high-severity-vulnerability-cve-2023-29552-discovered-service-location-protocol-slpExploit, Third Party Advisory
Other references
- datatracker.ietf.org/doc/html/rfc2608Technical Description
- github.com/curesec/slploadProduct
Other vulnerabilities in Smi-s Provider
- 7.5 High severity
- 7.8 High severity
- 7.3 High severity
- 7.5 High severity
- 7.3 High severity
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