CVE-2021-42375 Denial of service in busybox
Attackers can cause denial of service in BusyBox ash by crafting specific shell commands that exploit incorrect character handling.
- 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-2021-42375?
CVE-2021-42375 is a medium-severity denial of service 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
An incorrect handling of a special element in Busybox's ash applet leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.
Weakness: CWE-159
Which versions are affected by CVE-2021-42375?
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-2021-42375?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-42375 being exploited?
There is no known exploitation of CVE-2021-42375 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2021-42375, DEBIAN-CVE-2021-42375, GHSA-h7xx-2pfg-qqhm.