XXE in OpenStack Nova
CVE-2020-17376
An issue was discovered in Guest.migrate in virt/libvirt/guest.py in OpenStack Nova before 19.3.1, 20.x before 20.3.1, and 21.0.0. By performing a soft reboot of an instance that has previously undergone live migration, a user may gain access to destination host devices that share the same paths as host devices previously referenced by the virtual machine on the source host. This can include block devices that map to different Cinder volumes at the destination than at the source. Only deployments allowing host-based connections (for instance, root and ephemeral devices) are affected.
Vulnerability class: XXE (XML External Entity)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.017 (77.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- OpenStack Nova — versions 21.0.0
Weakness classification (CWE)
References
- launchpad.net/bugs/1890501 (Exploit, Third Party Advisory)
- security.openstack.org/ossa/OSSA-2020-006.html (Patch, Vendor Advisory)
- www.openwall.com/lists/oss-security/2020/08/25/4 (Patch, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-17376?
- CVE-2020-17376 is a high-severity vulnerability in OpenStack Nova, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 8.3/10. Published 2020-08-26.
- How severe is CVE-2020-17376?
- High severity. CVSS v3 base score is 8.3 out of 10.