Vulnerability Name:

CVE-2017-12213 (CCN-131494)

Assigned:2017-09-06
Published:2017-09-06
Updated:2019-10-09
Summary:A vulnerability in the dynamic access control list (ACL) feature of Cisco IOS XE Software running on Cisco Catalyst 4000 Series Switches could allow an unauthenticated, adjacent attacker to cause dynamic ACL assignment to fail and the port to fail open. This could allow the attacker to pass traffic to the default VLAN of the affected port. The vulnerability is due to an uncaught error condition that may occur during the reassignment of the auth-default-ACL dynamic ACL to a switch port after 802.1x authentication fails. A successful exploit of this issue could allow a physically adjacent attacker to bypass 802.1x authentication and cause the affected port to fail open, allowing the attacker to pass traffic to the default VLAN of the affected switch port. Cisco Bug IDs: CSCvc72751.
CVSS v3 Severity:4.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
3.8 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
4.7 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)
4.1 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:3.3 Low (CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
3.3 Low (CCN CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-287
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2017-12213

Source: BID
Type: Third Party Advisory, VDB Entry
100663

Source: CCN
Type: BID-100663
Cisco Catalyst 4000 Series Switches CVE-2017-12213 Authentication Bypass Vulnerability

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1039284

Source: XF
Type: UNKNOWN
cisco-cat-cve201712213-sec-bypass(131494)

Source: CCN
Type: Cisco Security Advisory cisco-sa-20170906-cat
Cisco Catalyst 4000 Series Switches Dynamic ACL Bypass Vulnerability

Source: CONFIRM
Type: Mitigation, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-cat

Vulnerable Configuration:Configuration 1:
  • cpe:/o:cisco:ios_xe:-:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:catalyst_4000:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/h:cisco:catalyst_4000:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco ios xe -
    cisco catalyst 4000 -
    cisco catalyst 4000 *