Security restrictions bypass in Cisco Web Security Appliance - CVE-2018-0353
Published: June 6, 2018 / Updated: June 7, 2018
Vulnerability identifier: #VU13232
CSH Severity: Low
CVSS v4.0: 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
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco Web Security Appliance
Cisco Web Security Appliance
Detailed vulnerability 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.
How to mitigate CVE-2018-0353
The vulnerability is addressed in the following versions: 11.5.0-614, 10.5.2-061.