7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.566 Medium
EPSS
Percentile
97.7%
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)
#TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(107067);
script_version("1.10");
script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/13");
script_cve_id("CVE-2016-2178", "CVE-2016-2183", "CVE-2016-6304");
script_bugtraq_id(91081, 92630, 93150);
script_name(english:"Arista Networks EOS 4.17 Multiple Vulnerabilities (SA0024) (SWEET32)");
script_summary(english:"Checks the Arista Networks EOS version.");
script_set_attribute(attribute:"synopsis", value:
"The version of Arista Networks EOS running on the remote device is
affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"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)");
# https://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0310cb92");
script_set_attribute(attribute:"see_also", value:"https://sweet32.info");
script_set_attribute(attribute:"see_also", value:"https://www.openssl.org/blog/blog/2016/08/24/sweet32/");
script_set_attribute(attribute:"solution", value:
"Contact the vendor for a fixed version. Alternatively, apply the
recommended mitigations referenced in the vendor advisory.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-2183");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"in_the_news", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2016/06/06");
script_set_attribute(attribute:"patch_publication_date", value:"2016/10/04");
script_set_attribute(attribute:"plugin_publication_date", value:"2018/02/28");
script_set_attribute(attribute:"plugin_type", value:"combined");
script_set_attribute(attribute:"cpe", value:"cpe:/o:arista:eos");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("arista_eos_detect.nbin");
script_require_keys("Host/Arista-EOS/Version");
exit(0);
}
include("arista_eos_func.inc");
version = get_kb_item_or_exit("Host/Arista-EOS/Version");
vmatrix = make_array();
vmatrix["F"] = make_list("4.17.0<=4.17.1.1");
vmatrix["misc"] = make_list("4.17.1FX-VRRP6LL");
if (eos_is_affected(vmatrix:vmatrix, version:version))
{
security_report_v4(severity:SECURITY_WARNING, port:0, extra:eos_report_get());
}
else audit(AUDIT_INST_VER_NOT_VULN, "Arista Networks EOS", version);
7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.566 Medium
EPSS
Percentile
97.7%