Denial of service in FreeBSD

1) Resource exhaustion

EUVDB-ID: #VU14414

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-6923

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to an error when processing specially crafted input. A remote attacker can send a stream of specially crafted
fragments with a low packet rate, consume a large amount of CPU or all available mbuf clusters and cause the system to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

FreeBSD: 5.3 - 11.1

CPE2.3

• cpe:2.3:o:freebsd_foundation:freebsd:5.3:*:*:*:*:*:*:*
• cpe:2.3:o:freebsd_foundation:freebsd:5.4:*:*:*:*:*:*:*
• cpe:2.3:o:freebsd_foundation:freebsd:5.5:*:*:*:*:*:*:*

External links

https://www.freebsd.org/security/advisories/FreeBSD-SA-18:10.ip.asc

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.