Security restrictions bypass in Cisco Web Security Appliance



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-0353
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Cisco Web Security Appliance
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Security restrictions bypass

EUVDB-ID: #VU13232

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-0353

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The vulnerability exists in traffic-monitoring functions in Cisco Web Security Appliance (WSA) due to a change in the underlying operating system software that is responsible for monitoring affected traffic. A remote unauthenticated attacker can send a specially crafted IP packets, circumvent Layer 4 Traffic Monitor (L4TM) functionality, pass traffic through the device, which the WSA was configured to deny.

Mitigation

The vulnerability is addressed in the following versions: 11.5.0-614, 10.5.2-061.

Vulnerable software versions

Cisco Web Security Appliance: 10.5.1 - 11.0.0

CPE2.3 External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-wsa


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



###SIDEBAR###