VulnerabilityModified

CVE-2018-0353

HIGH 7.5EPSS 3.84%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (3.84%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A vulnerability in traffic-monitoring functions in Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to circumvent Layer 4 Traffic Monitor (L4TM) functionality and bypass security protections. The vulnerability is due to a change in the underlying operating system software that is responsible for monitoring affected traffic. An attacker could exploit this vulnerability by sending crafted IP packets to an affected device. A successful exploit could allow the attacker to pass traffic through the device, which the WSA was configured to deny. This vulnerability affects both IPv4 and IPv6 traffic. This vulnerability affects Cisco AsyncOS versions for WSA on both virtual and hardware appliances running any release of the 10.5.1, 10.5.2, or 11.0.0 WSA Software. The WSA is vulnerable if it is configured for L4TM. Cisco Bug IDs: CSCvg78875.

CVSS 3.0: 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS: 3.84% probability · 90th percentile
CISA KEV: Not listed
Weakness: CWE-254
Affected: cisco/web security appliance
Source: psirt@cisco.com

References

http://www.securityfocus.com/bid/104417Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041081Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-wsaVendor Advisory
http://www.securityfocus.com/bid/104417Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041081Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-wsaVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.