DoS in Cilium agent DNS proxy from crafted DNS responses
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 1.14.18, 1.15.12, 1.16.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. A denial of service vulnerability affects versions 1.14.0 through 1.14.7, 1.15.0 through 1.15.11, and 1.16.0 through 1.16.4. In a Kubernetes cluster where Cilium is configured to proxy DNS traffic, an attacker can crash Cilium agents by sending a crafted DNS response to workloads from outside the cluster. For traffic that is allowed but without using DNS-based policy, the dataplane will continue to pass traffic as configured at the time of the DoS. For workloads that have DNS-based policy configured, existing connections may continue to operate, and new connections made without relying on DNS resolution may continue to be established, but new connections which rely on DNS resolution may be disrupted. Any configuration changes that affect the impacted agent may not be applied until the agent is able to restart. This issue is fixed in Cilium v1.14.18, v1.15.12, and v1.16.5. No known workarounds are available.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- cilium cilium
From 1.14.0 · fixed in 1.14.18; From 1.15.0 · fixed in 1.15.12; From 1.16.0 · fixed in 1.16.5
- github.com/cilium/ciliumGo
From 1.14.0 · fixed in 1.14.18; From 1.15.0 · fixed in 1.15.12; From 1.16.0 · fixed in 1.16.5
- github.com/cilium/ciliumGo
From 1.14.0 · fixed in 1.14.18
- github.com/cilium/ciliumGo
From 1.15.0 · fixed in 1.15.12
- github.com/cilium/ciliumGo
From 1.16.0 · fixed in 1.16.5