PT-2023-2769 · Ntp+5 · Ntp+5

Rma-Xo · Published 2023-04-11 · Updated 2024-11-28 · CVE-2023-26554

Positive Technologies (AI Summary)

CVSS v3.1

5.6

Medium

Base vector

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

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

Description The issue is related to an out-of-bounds write in the mstolfp() function in libntp/mstolfp.c when adding a '0' character. This can be exploited by a remote attacker to potentially execute arbitrary code by sending a specially crafted request to the server. The vulnerability affects the ntpq process, but not ntpd. It can also cause a denial of service.

Recommendations For NTP version 4.2.8p15, consider disabling the mstolfp() function in libntp/mstolfp.c as a temporary workaround until a patch is available. Restrict access to the ntpq process 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

DoS

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALT-PU-2024-15733

ALT-PU-2024-16188

BDU:2023-02659

CVE-2023-26554

OESA-2023-1282

SUSE-SU-2023:2142-1

SUSE-SU-2023:2171-1

Affected Products

Alt Linux

Astra Linux

Debian

Ibm Aix

Ntp

Suse

References · 33

• 🔥 https://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26554 · Exploit
• 🔥 https://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506667321 · Exploit
• https://osv.dev/vulnerability/CVE-2023-26554 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-26553 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2023-26551 · Security Note
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2025-1020SE47 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-26554 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2023-1282 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2025-0923SE17 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-26554 · Security Note
• https://cve.org/CVERecord?id=CVE-2023-26554 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2023:2171-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-02659 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-26554 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-26554 · Vendor Advisory