Denial of service in ISC dhcpd

Published: 2018-03-01

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-5732 CVE-2018-5733
CWE-ID	CWE-120 CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	DHCP Server applications / Other server solutions
Vendor	ISC

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU10790

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-2018-5732

CWE-ID: CWE-120 - Buffer overflow

Exploit availability: No

Description

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

The weakness exists in the dhclient due to buffer overflow. A remote attacker can send specially crafted response, trigger memory corruption and cause the service to crash.

Mitigation

Update to versions 4.1-ESV-R15-P1, 4.3.6-P1 or 4.4.1.

Vulnerable software versions

DHCP: 4.1.0 - 4.4.0

External links

http://kb.isc.org/article/AA-01565/75/CVE-2018-5732

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) Memory corruption

EUVDB-ID: #VU10791