Denial of service in Cisco StarOS

1) Improper input validation

EUVDB-ID: #VU13855

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-2018-0369

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists in the reassembly logic for fragmented IPv4 packets of Cisco StarOS running on virtual platforms due to improper handling of fragmented IPv4 packets containing options. A remote attacker can send a malicious IPv4 packet across an affected device, trigger a restart of the npusim process and cause all traffic queued toward this instance of the npusim process to be dropped while the process is restarting.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco StarOS: 21.3.15 - 21.8.0

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180711-staros-dos

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.