1) Resource exhaustion

Risk: Medium

CVSSv3: 7.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2018-6922

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('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 the system uses an inefficient TCP reassembly algorithm. A remote attacker can send specially crafted packets within ongoing TCP sessions to consume excessive CPU resources and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM AIX: 5.3, 6.1, 7.1, 7.2

CPE

• cpe:/o:ibm_corporation:ibm_aix:7.2:
• cpe:/o:ibm_corporation:ibm_aix:7.1:
• cpe:/o:ibm_corporation:ibm_aix:6.1:
• cpe:/o:ibm_corporation:ibm_aix:5.3:

External links

http://aix.software.ibm.com/aix/efixes/security/freebsd_advisory.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.