CVE-2020-14311 Integer overflow in grub2
An integer overflow in GRUB2's symlink handling leads to a heap buffer overflow, allowing local attackers to execute arbitrary code and escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-14311?
CVE-2020-14311 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 31 Jul 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.
Which versions are affected by CVE-2020-14311?
It affects 7 products.
Products include Canonical Ubuntu Linux, Gnu Grub2, Opensuse Leap, Redhat Enterprise Linux, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server Aus and 1 more.
How do I fix CVE-2020-14311?
Upgrade to a fixed version.
Is CVE-2020-14311 being exploited?
There is no known exploitation of CVE-2020-14311 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as ALPINE-CVE-2020-14311, AZL-6459, DEBIAN-CVE-2020-14311, GHSA-2jpf-4r7j-42qr, UBUNTU-CVE-2020-14311.