Amazon Linux AMI update for dhcp

Published: 2018-04-06

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-5733 CVE-2018-5732
CWE-ID	CWE-119 CWE-120
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Memory corruption

EUVDB-ID: #VU10791

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5733

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the dhcpd due to improper handling of reference counting when processing client requests. A remote attacker can send large amounts of data to the target server can send a large number of packets, trigger a reference counter overflow and cause the target dhcpd service to consume all available memory and crash.

Mitigation

Update the affected packages.

i686:
    dhcp-4.1.1-53.P1.27.amzn1.i686
    dhcp-debuginfo-4.1.1-53.P1.27.amzn1.i686
    dhcp-common-4.1.1-53.P1.27.amzn1.i686
    dhclient-4.1.1-53.P1.27.amzn1.i686
    dhcp-devel-4.1.1-53.P1.27.amzn1.i686

src:
    dhcp-4.1.1-53.P1.27.amzn1.src

x86_64:
    dhcp-debuginfo-4.1.1-53.P1.27.amzn1.x86_64
    dhcp-devel-4.1.1-53.P1.27.amzn1.x86_64
    dhclient-4.1.1-53.P1.27.amzn1.x86_64
    dhcp-common-4.1.1-53.P1.27.amzn1.x86_64
    dhcp-4.1.1-53.P1.27.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2018-984.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.

2) Buffer overflow

EUVDB-ID: #VU10790