Vulnerability Name:

CVE-2015-4321 (CCN-105519)

Assigned:2015-08-12
Published:2015-08-12
Updated:2017-09-21
Summary:The Unicast Reverse Path Forwarding (uRPF) implementation in Cisco Adaptive Security Appliance (ASA) Software 9.3(1.50), 9.3(2.100), 9.3(3), and 9.4(1) mishandles cases where an IP address belongs to an internal interface but is also in the ASA routing table, which allows remote attackers to bypass uRPF validation via spoofed packets, aka Bug ID CSCuv60724.
CVSS v3 Severity:5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
3.7 Low (Temporal CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
3.7 Low (CCN Temporal CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-20
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2015-4321

Source: CCN
Type: Cisco Vulnerability Alert 40440
Cisco ASA Unicast Reverse Path Forwarding (uRPF) Bypass Vulnerability

Source: CISCO
Type: Vendor Advisory
20150812 Cisco ASA Unicast Reverse Path Forwarding (uRPF) Bypass Vulnerability

Source: SECTRACK
Type: UNKNOWN
1033265

Source: XF
Type: UNKNOWN
cisco-asa-cve20154321-sec-bypass(105519)

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cisco:adaptive_security_appliance_software:9.3(1.50):*:*:*:*:*:*:*
  • OR cpe:/a:cisco:adaptive_security_appliance_software:9.3(2.100):*:*:*:*:*:*:*
  • OR cpe:/a:cisco:adaptive_security_appliance_software:9.3(3):*:*:*:*:*:*:*
  • OR cpe:/a:cisco:adaptive_security_appliance_software:9.4(1):*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco adaptive security appliance software 9.3(1.50)
    cisco adaptive security appliance software 9.3(2.100)
    cisco adaptive security appliance software 9.3(3)
    cisco adaptive security appliance software 9.4(1)