Denial of service in Cisco Wide Area Application Services

1) Denial of service

EUVDB-ID: #VU6399

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6628

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The weakness exists due to a Secure Sockets Layer/Transport Layer Security (SSL/TLS) alert being incorrectly handled in a specific SSL/TLS connection state. A remote attacker can establish a SMART-SSL connection through the targeted device, send a specially crafted stream of SSL/TLS traffic and cause the WAN optimization to stop functioning while the process restarts.

Successful exploitation of the vulnerability may result in denial of service.

Mitigation

Update to version 6.2.3b.

Vulnerable software versions

Cisco Wide Area Application Services: 6.2.3a - 6.3.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-waas

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.