Amazon Linux AMI update for ntp

1) NULL pointer dereference

EUVDB-ID: #VU20339

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

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

Update the affected packages:

i686:
    ntp-debuginfo-4.2.8p12-1.41.amzn1.i686
    ntp-4.2.8p12-1.41.amzn1.i686
    ntpdate-4.2.8p12-1.41.amzn1.i686

noarch:
    ntp-doc-4.2.8p12-1.41.amzn1.noarch
    ntp-perl-4.2.8p12-1.41.amzn1.noarch

src:
    ntp-4.2.8p12-1.41.amzn1.src

x86_64:
    ntp-4.2.8p12-1.41.amzn1.x86_64
    ntp-debuginfo-4.2.8p12-1.41.amzn1.x86_64
    ntpdate-4.2.8p12-1.41.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2019-1206.html

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.