Arista Networks EOS 4.17 Multiple Vulnerabilities (SA0024) (SWEET32)

High Nessus Plugin ID 107067

Synopsis

The version of Arista Networks EOS running on the remote device is affected by multiple vulnerabilities.

Description

The version of Arista Networks EOS running on the remote device is affected by multiple vulnerabilities in the included OpenSSL library :

- An information disclosure vulnerability exists in the dsa_sign_setup() function in dsa_ossl.c due to a failure to properly ensure the use of constant-time operations.
An unauthenticated, remote attacker can exploit this, via a timing side-channel attack, to disclose DSA key information. (CVE-2016-2178)

- A vulnerability exists, known as SWEET32, in the 3DES and Blowfish algorithms due to the use of weak 64-bit block ciphers by default. A man-in-the-middle attacker who has sufficient resources can exploit this vulnerability, via a 'birthday' attack, to detect a collision that leaks the XOR between the fixed secret and a known plaintext, allowing the disclosure of the secret text, such as secure HTTPS cookies, and possibly resulting in the hijacking of an authenticated session.
(CVE-2016-2183)

- A flaw exists in the ssl_parse_clienthello_tlsext() function in t1_lib.c due to improper handling of overly large OCSP Status Request extensions from clients. An unauthenticated, remote attacker can exploit this, via large OCSP Status Request extensions, to exhaust memory resources, resulting in a denial of service condition.
(CVE-2016-6304)

Solution

Contact the vendor for a fixed version. Alternatively, apply the recommended mitigations referenced in the vendor advisory.

See Also

http://www.nessus.org/u?0310cb92

https://sweet32.info

https://www.openssl.org/blog/blog/2016/08/24/sweet32/

Plugin Details

Severity: High

ID: 107067

File Name: arista_eos_sa0024_4_17.nasl

Version: 1.4

Type: combined

Family: Misc.

Published: 2018/02/28

Modified: 2018/08/09

Dependencies: 107070

Risk Information

Risk Factor: High

CVSSv2

Base Score: 7.8

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

CVSSv3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/o:arista:eos

Required KB Items: Host/Arista-EOS/Version, Host/Arista-EOS/eos_shell

Patch Publication Date: 2016/10/04

Vulnerability Publication Date: 2016/06/06

Reference Information

CVE: CVE-2016-2178, CVE-2016-2183, CVE-2016-6304

BID: 91081, 92630, 93150