CVE-2017-12855 Information disclosure in n/a
A race condition in Xen allows a guest to reuse memory while still accessible by another domain, leading to information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-12855?
CVE-2017-12855 is a medium-severity vulnerability in Xen Xen, published on 15 Aug 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a grant is in use. A guest is expected not to modify the grant details while it is in use, whereas the guest is free to modify/reuse the grant entry when it is not in use. Under some circumstances, Xen will clear the status bits too early, incorrectly informing the guest that the grant is no longer in use. A guest may prematurely believe that a granted frame is safely private again, and reuse it in a way which contains sensitive information, while the domain on the far end of the grant is still using the grant. Xen 4.9, 4.8, 4.7, 4.6, and 4.5 are affected.
Weakness: CWE-200
Which versions are affected by CVE-2017-12855?
It affects 1 product.
Products include Xen Xen.
How do I fix CVE-2017-12855?
Apply the vendor's patch.
Is CVE-2017-12855 being exploited?
There is no known exploitation of CVE-2017-12855 in the wild and no public exploit code.
Other vulnerabilities in Xen Xen
Sources
Also known as ALPINE-CVE-2017-12855, DEBIAN-CVE-2017-12855, GHSA-c6pm-8crm-3rr8, UBUNTU-CVE-2017-12855.