Amazon Linux AMI update for ntp

1) Stack-based buffer overflow

EUVDB-ID: #VU14448

Risk: Low

CVSSv3.1: 8.3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: CVE-2018-12327

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: Yes

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The vulnerability exists due to stack-based buffer overflow in the Network Time Protocol Query (ntpq) program and Network Time Protocol daemon (ntpd) when handling malicious input. A local attacker can submit a long string argument for an IPv4 or IPv6 command-line parameter, trigger memory corruption and execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected packages.

i686:
    ntpdate-4.2.8p12-1.39.amzn1.i686
    ntp-4.2.8p12-1.39.amzn1.i686
    ntp-debuginfo-4.2.8p12-1.39.amzn1.i686

noarch:
    ntp-perl-4.2.8p12-1.39.amzn1.noarch
    ntp-doc-4.2.8p12-1.39.amzn1.noarch

src:
    ntp-4.2.8p12-1.39.amzn1.src

x86_64:
    ntp-debuginfo-4.2.8p12-1.39.amzn1.x86_64
    ntp-4.2.8p12-1.39.amzn1.x86_64
    ntpdate-4.2.8p12-1.39.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2018-1083.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

2) Security restrictions bypass

EUVDB-ID: #VU10801

Risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7170

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to bypass security restrictions on the target system.

The weakness exists due to insufficient security restrictions. A remote attacker can create multiple crafted ephemeral associations to bypass security restrictions and modify the clock.

Mitigation

Update the affected packages.

i686:
    ntpdate-4.2.8p12-1.39.amzn1.i686
    ntp-4.2.8p12-1.39.amzn1.i686
    ntp-debuginfo-4.2.8p12-1.39.amzn1.i686

noarch:
    ntp-perl-4.2.8p12-1.39.amzn1.noarch
    ntp-doc-4.2.8p12-1.39.amzn1.noarch

src:
    ntp-4.2.8p12-1.39.amzn1.src

x86_64:
    ntp-debuginfo-4.2.8p12-1.39.amzn1.x86_64
    ntp-4.2.8p12-1.39.amzn1.x86_64
    ntpdate-4.2.8p12-1.39.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2018-1083.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.

3) Security restrictions bypass

EUVDB-ID: #VU10806

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-1549

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to insufficient security restrictions. A remote attacker can create multiple crafted ephemeral associations to bypass security restrictions and modify the clock.

Mitigation

Update the affected packages.

i686:
    ntpdate-4.2.8p12-1.39.amzn1.i686
    ntp-4.2.8p12-1.39.amzn1.i686
    ntp-debuginfo-4.2.8p12-1.39.amzn1.i686

noarch:
    ntp-perl-4.2.8p12-1.39.amzn1.noarch
    ntp-doc-4.2.8p12-1.39.amzn1.noarch

src:
    ntp-4.2.8p12-1.39.amzn1.src

x86_64:
    ntp-debuginfo-4.2.8p12-1.39.amzn1.x86_64
    ntp-4.2.8p12-1.39.amzn1.x86_64
    ntpdate-4.2.8p12-1.39.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2018-1083.html

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.