SSLv3 Padding Oracle On Downgraded Legacy Encryption in Cisco ASA Software (cisco-sa-20141015-poodle) (POODLE)

Medium Nessus Plugin ID 78750

Synopsis

The remote device is affected by a man-in-the-middle (MitM) information disclosure vulnerability known as POODLE.

Description

The remote Cisco ASA device is affected by a man-in-the-middle (MitM) information disclosure vulnerability known as POODLE. The vulnerability is due to the way SSL 3.0 handles padding bytes when decrypting messages encrypted using block ciphers in cipher block chaining (CBC) mode. A MitM attacker can decrypt a selected byte of a cipher text in as few as 256 tries if they are able to force a victim application to repeatedly send the same data over newly created SSL 3.0 connections.

Note that all versions of ASA are affected; however, the workaround does not work for versions 8.0.x, 8.1.x, 9.0.x, and 9.1(1)x. Please refer to the advisory or contact the vendor for possible solutions.

Solution

Apply the workaround by disabling SSLv3 referenced in the Cisco bug ID CSCur23709, or contact the vendor.

See Also

http://www.nessus.org/u?7453d3be

https://tools.cisco.com/bugsearch/bug/CSCur23709

https://www.imperialviolet.org/2014/10/14/poodle.html

https://www.openssl.org/~bodo/ssl-poodle.pdf

https://tools.ietf.org/html/draft-ietf-tls-downgrade-scsv-00

Plugin Details

Severity: Medium

ID: 78750

File Name: cisco-sa-20141015-poodle-asa.nasl

Version: 1.15

Type: local

Family: CISCO

Published: 2014/10/30

Updated: 2018/07/06

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:adaptive_security_appliance_software

Required KB Items: Host/Cisco/ASA

Exploit Available: false

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 2014/10/14

Reference Information

CVE: CVE-2014-3566

BID: 70574

CERT: 577193

CISCO-BUG-ID: CSCur23709

CISCO-SA: cisco-sa-20141015-poodle