#VU37004 Improper Certificate Validation in BusyBox - CVE-2018-1000500

Vulnerability identifier: #VU37004

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-1000500

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BusyBox
Universal components / Libraries / Software for developers

Vendor: busybox.net

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Busybox contains a Missing SSL certificate validation vulnerability in The "busybox wget" applet that can result in arbitrary code execution. This attack appear to be exploitable via Simply download any file over HTTPS using "busybox wget https://compromised-domain.com/important-file".

Mitigation
Install update from vendor's website.

Vulnerable software versions

BusyBox: 1.00 - 1.31.1

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External links
https://lists.busybox.net/pipermail/busybox/2018-May/086462.html
https://git.busybox.net/busybox/commit/?id=45fa3f18adf57ef9d743038743d9c90573aeeb91

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.