CVE-2016-9380 Path traversal in n/a
Local guest administrators can read or delete arbitrary host files via NUL bytes in bootloader config when using pygrub with nul-delimited output.
- 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-2016-9380?
CVE-2016-9380 is a high-severity path traversal vulnerability in Citrix Xenserver, published on 23 Jan 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file.
Weakness: CWE-20
Which versions are affected by CVE-2016-9380?
It affects 2 products.
Products include Citrix Xenserver, Xen Xen.
How do I fix CVE-2016-9380?
Apply the vendor's patch.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2016-9380 being exploited?
There is no known exploitation of CVE-2016-9380 in the wild and no public exploit code.
Other vulnerabilities in Citrix Xenserver
Sources
Also known as ALPINE-CVE-2016-9380, DEBIAN-CVE-2016-9380, GHSA-58r5-2fcj-4x5p, UBUNTU-CVE-2016-9380.