CVE-2021-42376 Null dereference in busybox
A NULL pointer dereference in BusyBox hush allows denial of service via crafted shell commands, affecting systems using BusyBox.
- 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-2021-42376?
CVE-2021-42376 is a medium-severity vulnerability in Fedoraproject Fedora, published on 15 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A NULL pointer dereference in Busybox's hush applet leads to denial of service when processing a crafted shell command, due to missing validation after a \x03 delimiter character. This may be used for DoS under very rare conditions of filtered command input.
Weakness: CWE-476
Which versions are affected by CVE-2021-42376?
It affects 12 products.
Products include Busybox Busybox, Fedoraproject Fedora, Netapp Cloud Backup, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410s Firmware and 6 more.
How do I fix CVE-2021-42376?
Apply the vendor's patch.
Is CVE-2021-42376 being exploited?
There is no known exploitation of CVE-2021-42376 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as AZL-6344, DEBIAN-CVE-2021-42376, GHSA-rxm7-xwcf-84fm.