Kubevirt: virt-handler-rhel9: kubevirt: virt-handler migration proxy follows symlinks allowing container escape to host
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
- 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: no
- Technical impact: total
Summary
A symlink following vulnerability was found in KubeVirt's virt-handler migration proxy. During live migration, virt-handler dials Unix sockets inside the target virt-launcher pod via /proc/<pid>/root/ paths using net.Dial() without symlink protection. These socket paths reside in qemu-owned directories writable by the virt-launcher user. An attacker with namespace edit and pods/exec permissions can replace a migration proxy socket with a symlink to the host CRI-O socket. Because virt-handler runs as root in the host mount namespace, absolute symlink targets resolve against the host filesystem, and the bidirectional io.Copy proxy relays attacker-controlled bytes to the container runtime, enabling full node compromise.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- container-native-virtualization/virt-handler
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported
- container-native-virtualization/virt-handler-rhel9
Version range not reported