Multiple vulnerabilities in ntpd
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2020-13817 CVE-2018-8956 |
| CWE-ID | CWE-125 CWE-399 CWE-20 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
ntp Server applications / Other server solutions |
| Vendor | ntp.org |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
Updated: 07.07.2020
Added vulnerability #4, assigned CVE-ID to vulnerability #2.
1) Out-of-bounds read
EUVDB-ID: #VU26240
Risk: Low
CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: N/A
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in ntp daemon with enabled ntpdc (mode 7). A remote attacker can send short packets to the affected ntp daemon and perform a denial of service attack against the ntp server.
Install updates from vendor's website.
Vulnerable software versionsntp: 4.0.72 - 4.3.94
External linkshttp://support.ntp.org/bin/view/Main/NtpBug3610
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.
2) Resource management error
EUVDB-ID: #VU26241
Risk: Low
CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-13817
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to ntpd uses highly predictable timestamps that can allow spoofing attack over IPv4 or a denial of service attack. A remote non-authenticated attacker can modify clock on the client NTP server to terminate it.
Install updates from vendor's website.
Vulnerable software versionsntp: 4.0.72 - 4.3.94
External linkshttp://support.ntp.org/bin/view/Main/NtpBug3596
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.
3) Resource management error
EUVDB-ID: #VU26242
Risk: Low
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: N/A
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to unspecified error in ntp client. A remote attacker can perform a denial of service attack against an unauthenticated client.
Install updates from vendor's website.
Vulnerable software versionsntp: 4.2.8p12 - 4.2.8p13
External linkshttp://support.ntp.org/bin/view/Main/NtpBug3592
http://support.ntp.org/bin/view/Main/SecurityNotice#March_2020_ntp_4_2_8p14_NTP_Rele
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.
4) Input validation error
EUVDB-ID: #VU29542
Risk: Low
CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-8956
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input when processing NTP packets. A remote attacker that controls a slave server or is part of the same broadcast can prevent a broadcast client from synchronizing its clock with a broadcast NTP server via spoofed mode 3 and mode 5 packets.
Install updates from vendor's website.
Vulnerable software versionsntp: 4.2.8p10 - 4.2.8p13
External linkshttp://www.ntp.org/
http://arxiv.org/abs/2005.01783
http://nikhiltripathi.in/NTP_attack.pdf
http://security.netapp.com/advisory/ntap-20200518-0006/
http://tools.ietf.org/html/rfc5905
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.
