Vulnerability identifier: #VU76002

Vulnerability risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-26555

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
ntp
Server applications / Other server solutions

Vendor: ntp.org

Description

The vulnerability allows an attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error within praecis_parse() function in ntpd/refclock_palisade.c. An attacker with physical proximity to device can trigger an out-of-bounds write error by manipulating the GPS receiver and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ntp: 4.2.8 - 4.2.8p15

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External links
http://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26555
http://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506546409

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Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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