CVE-2019-18422 Privilege escalation in n/a
A malicious ARM guest can cause denial of service or privilege escalation in Xen by exploiting erroneous interrupt unmasking in exception handlers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-18422?
CVE-2019-18422 is a high-severity vulnerability in Debian Debian Linux, published on 31 Oct 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in Xen through 4.12.x allowing ARM guest OS users to cause a denial of service or gain privileges by leveraging the erroneous enabling of interrupts. Interrupts are unconditionally unmasked in exception handlers. When an exception occurs on an ARM system which is handled without changing processor level, some interrupts are unconditionally enabled during exception entry. So exceptions which occur when interrupts are masked will effectively unmask the interrupts. A malicious guest might contrive to arrange for critical Xen code to run with interrupts erroneously enabled. This could lead to data corruption, denial of service, or possibly even privilege escalation. However a precise attack technique has not been identified.
Weakness: CWE-732
Which versions are affected by CVE-2019-18422?
It affects 3 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Xen Xen.
How do I fix CVE-2019-18422?
Apply the vendor's patch.
Is CVE-2019-18422 being exploited?
There is no known exploitation of CVE-2019-18422 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2019-18422, DEBIAN-CVE-2019-18422, GHSA-4rjw-rr87-jjgv, UBUNTU-CVE-2019-18422.