Vulnerability identifier: #VU6393
Vulnerability risk: High
CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-401
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
FreeBSD
Operating systems & Components /
Operating system
Vendor: FreeBSD Foundation
Description
The vulnerability allows a remote attacker to cause denial of service conditions.
The vulnerability exists due to an error within ipfilter(4) implementation, when processing specially crafted fragmented packets and the packet filter is configured to perform stateful packet inspection, using the "keep state" or "keep frags" rule options. A remote attacker can send a series of specially crafted fragmented packets to vulnerable system and trigger kernel panic and system reboot.
Successful exploitation of the vulnerability may allow an attacker to perform a denial of service (DoS) attack.
Mitigation
Install patch from vendor's website:
https://security.FreeBSD.org/patches/SA-17:04/ipfilter.patch
https://security.FreeBSD.org/patches/SA-17:04/ipfilter.patch.asc
Vulnerable software versions
FreeBSD: 10.0 - 11.0
External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-17:04.ipfilter.asc
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.