IBM AIX update for NTP

1) NULL pointer dereference

EUVDB-ID: #VU20339

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-8936

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error when processing authenticated mode 6 packets. A remote attacker can send malicious authenticated mode 6 (ntpq) packet from a permitted network address, trigger a NULL pointer dereference error and crash ntpd.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

IBM AIX: 7.1 - 7.2.3

CPE2.3

• cpe:2.3:o:ibm_corporation:ibm_aix:7.1:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:ibm_aix:7.1.1:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:ibm_aix:7.1.2:*:*:*:*:*:*:*

External links

https://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc

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.