Local buffer overflow in CLI parser in Cisco ASA Appliances

Published: 2016-08-18 13:39:06
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2016-6367
CVSSv3 8.2 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]
CWE ID CWE-119
Exploitation vector Local
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software Cisco ASA 5500
Cisco ASA 5500-X Series
Cisco PIX Firewall
Vulnerable software versions Cisco ASA 5500 7.2(5)
Cisco ASA 5500 8.0(5)
Cisco ASA 5500 8.2(x)
Cisco ASA 5500 8.3(x)
Cisco ASA 5500 8.4(x)
Cisco ASA 5500-X Series 8.6(x)
Cisco PIX Firewall -
Vendor URL Cisco Systems, Inc

Security Advisory

1) CLI parser buffer overflow

Description

The vulnerability allows a local user to cause denial of service or execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the command-line interface (CLI) parser. A local authenticated user can trigger buffer overflow and reload the affected device or execute arbitrary code on the target system.

Successful exploitation of this vulnerability will allow a local user to execute arbitrary code on vulnerable system.

The following models of CISCO ASA appliances are affected:

  • Cisco ASA 5500 Series Adaptive Security Appliances
  • Cisco ASA 5500-X Series Next-Generation Firewalls
  • Cisco PIX Firewalls
  • Cisco Firewall Services Module (FWSM)

Note: this is a zero-day vulnerability, discovered after security breach of The Equation Group. The exploit code for this vulnerability was publicly exposed and is referred as EPICBANANA Exploit.

Remediation

Update to Cisco ASA Software Releases 8.4.1 and later.

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-cli
https://blogs.cisco.com/security/shadow-brokers

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