Vulnerability identifier: #VU13855
Vulnerability 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:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Cisco StarOS
Operating systems & Components /
Operating system
Vendor: Cisco Systems, Inc
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
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.