Vulnerability identifier: #VU17182

Vulnerability risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-6443

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
NTPsec
Client/Desktop applications / Encryption software

Vendor: The NTPsec project

Description

The vulnerability allows a remote authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a bug in ctl_getitem. A remote attacker can trigger a stack-based buffer over-read in read_sysvars in ntp_control.c in ntpd and perform a denial of service attack.

Mitigation
Update to version 1.1.3.

Vulnerable software versions

NTPsec: 0.9.0 - 1.1.2

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External links
http://dumpco.re/blog/ntpsec-bugs
http://dumpco.re/bugs/ntpsec-oobread1
http://github.com/ntpsec/ntpsec/blob/NTPsec_1_1_3/NEWS
http://www.exploit-db.com/exploits/46175/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.