Vulnerability · Published Nov 15, 2021 · Assigned by JFROG
CVE-2021-42377
Critical 9.8
In plain English
A critical-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 3.6% (higher than 90% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)3.6%top 10.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An attacker-controlled pointer free in Busybox's hush applet leads to denial of service and possible code execution when processing a crafted shell command, due to the shell mishandling the &&& string. This may be used for remote code execution under rare conditions of filtered command input.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | busybox | 0 | ALPINE-CVE-2021-42377 |
| Alpine:v3.21 | busybox | 0 | ALPINE-CVE-2021-42377 |
| Alpine:v3.22 | busybox | 0 | ALPINE-CVE-2021-42377 |
| Alpine:v3.23 | busybox | 0 | ALPINE-CVE-2021-42377 |
| Alpine:v3.24 | busybox | 0 | ALPINE-CVE-2021-42377 |
| Debian:12 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42377 |
| Debian:13 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42377 |
| Debian:14 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42377 |
| Ubuntu:22.04:LTS | busybox | 1:1.30.1-6ubuntu3 | UBUNTU-CVE-2021-42377 |
Affected products (as reported)
Weakness: CWE-590
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