Amazon Linux AMI update for dhcp

1) Input validation error

EUVDB-ID: #VU53609

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-25217

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack or gain access to sensitive information.

The vulnerability exists due to insufficient validation of options data stored in DHCP leases. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack or gain access to sensitive information.

Both dhcpd and dhclient are affected by the vulnerability.

Mitigation

Update the affected packages:

i686:
    dhclient-4.1.1-53.P1.29.amzn1.i686
    dhcp-4.1.1-53.P1.29.amzn1.i686
    dhcp-devel-4.1.1-53.P1.29.amzn1.i686
    dhcp-debuginfo-4.1.1-53.P1.29.amzn1.i686
    dhcp-common-4.1.1-53.P1.29.amzn1.i686

src:
    dhcp-4.1.1-53.P1.29.amzn1.src

x86_64:
    dhcp-4.1.1-53.P1.29.amzn1.x86_64
    dhclient-4.1.1-53.P1.29.amzn1.x86_64
    dhcp-devel-4.1.1-53.P1.29.amzn1.x86_64
    dhcp-common-4.1.1-53.P1.29.amzn1.x86_64
    dhcp-debuginfo-4.1.1-53.P1.29.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2021-1510.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.