Vulnerability identifier: #VU31448

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-6301

CWE-ID: CWE-399

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 perform a denial of service (DoS) attack.

The recv_and_process_client_pkt function in networking/ntpd.c in busybox allows remote attackers to cause a denial of service (CPU and bandwidth consumption) via a forged NTP packet, which triggers a communication loop.

Mitigation
Install update from vendor's website.

Vulnerable software versions

BusyBox: 1.20.0 - 1.25.0

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External links
http://packetstormsecurity.com/files/153278/WAGO-852-Industrial-Managed-Switch-Series-Code-Execution-Hardcoded-Credentials.html
http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
http://seclists.org/fulldisclosure/2019/Jun/18
http://seclists.org/fulldisclosure/2019/Sep/7
http://seclists.org/fulldisclosure/2020/Mar/15
http://www.openwall.com/lists/oss-security/2016/08/03/7
http://www.securityfocus.com/bid/92277
http://bugzilla.redhat.com/show_bug.cgi?id=1363710
http://git.busybox.net/busybox/commit/?id=150dc7a2b483b8338a3e185c478b4b23ee884e71
http://seclists.org/bugtraq/2019/Jun/14
http://seclists.org/bugtraq/2019/Sep/7
http://security.gentoo.org/glsa/201701-05

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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.