PT-2023-2770 · Ntp+4 · Ntp+4

Published 2023-04-11 · Updated 2024-11-28 · CVE-2023-26555

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions NTP version 4.2.8p15

Description The issue is related to an out-of-bounds write in the praecis parse function in ntpd/refclock palisade.c. This could potentially allow a remote attacker to cause a denial of service by sending a specially crafted packet to the NTP server. Any attack method would be complex, for example, using a manipulated GPS receiver.

Recommendations For NTP version 4.2.8p15, consider disabling the praecis parse function as a temporary workaround until a patch is available. Restrict access to the refclock palisade.c module to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALT-PU-2024-15733

ALT-PU-2024-16188

BDU:2023-02660

CVE-2023-26555

OESA-2023-1292

OPENSUSE-SU-2024:12997-1

SUSE-SU-2023:2608-1

SUSE-SU-2023:2609-1

SUSE-SU-2023_2608-1

SUSE-SU-2023_2609-1

Affected Products

Alt Linux

Astra Linux

Debian

Ntp

Suse

References · 29

• 🔥 https://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26555 · Exploit
• 🔥 https://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506546409 · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-26555 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-26555 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3VHEHHWCTYSB7HVJLYPVK4RPJZ5LX52 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2023:2609-1 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2025-1020SE47 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2023-1292 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-26555 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-26555 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-26555 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2023:2608-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-26555 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2025-0923SE17 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY2SVYH4MKPAXEYHCCXD3Z6VGINLSVHK · Vendor Advisory