Vulnerability · Published Nov 15, 2021 · Assigned by JFROG
CVE-2021-42376
Medium 5.5
In plain English
A medium-severity null pointer dereference 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 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.4%top 62.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | busybox | 0 | ALPINE-CVE-2021-42376 |
| Alpine:v3.21 | busybox | 0 | ALPINE-CVE-2021-42376 |
| Alpine:v3.22 | busybox | 0 | ALPINE-CVE-2021-42376 |
| Alpine:v3.23 | busybox | 0 | ALPINE-CVE-2021-42376 |
| Alpine:v3.24 | busybox | 0 | ALPINE-CVE-2021-42376 |
| Debian:12 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42376 |
| Debian:13 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42376 |
| Debian:14 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42376 |
Affected products (as reported)
Weakness: CWE-476
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