Vulnerability identifier: #VU85778
Vulnerability risk: Medium
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-284
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Cisco 250 Series Smart Switches
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Cisco 350 Series Managed Switches
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Cisco 350X Series Stackable Managed Switches
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Cisco 550X Series Stackable Managed Switches
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Business 250 Series Smart Switches
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Business 350 Series Managed Switches
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vendor:
Description
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to incorrect processing of ACLs on a stacked configuration when either the primary or backup switches experience a full stack reload or power cycle. A remote attacker can send specially crafted traffic through the device to bypass configured ACLs, causing traffic to be dropped or forwarded in an unexpected manner.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-bus-acl-bypass-5zn9hNJk
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf48882
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwh68993
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.