Vulnerability · Published Nov 15, 2021 · Assigned by JFROG
CVE-2021-42375
Medium 5.5
In plain English
A medium-severity security flaw in busybox from busybox. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.4%top 64.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42375 |
| Alpine:v3.21 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42375 |
| Alpine:v3.22 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42375 |
| Alpine:v3.23 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42375 |
| Alpine:v3.24 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42375 |
| Debian:12 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42375 |
| Debian:13 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42375 |
| Debian:14 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42375 |
| Ubuntu:22.04:LTS | busybox | 1:1.30.1-6ubuntu3 | UBUNTU-CVE-2021-42375 |
Affected products (as reported)
Weakness: CWE-159 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/
- FEDORA-2021-5a95823596 vendor-advisory
- FEDORA-2021-c52c0fe490 vendor-advisory
- https://security.netapp.com/advisory/ntap-20211223-0002/
- https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog