CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
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
EPSS
Percentile
99.4%
The Cisco AnyConnect Secure Mobility Client installed on the remote Mac OS X host is a version prior to 3.1.13015.0 or 4.2.x prior to 4.2.1035.0. It is, therefore, affected by multiple vulnerabilities in the bundled version of OpenSSL :
A carry propagating flaw exists in the x86_64 Montgomery squaring implementation that may cause the BN_mod_exp() function to produce incorrect results. An attacker can exploit this to obtain sensitive information regarding private keys. (CVE-2015-3193)
A NULL pointer dereference flaw exists in file rsa_ameth.c when handling ASN.1 signatures that use the RSA PSS algorithm but are missing a mask generation function parameter. A remote attacker can exploit this to cause the signature verification routine to crash, leading to a denial of service. (CVE-2015-3194)
A flaw exists in the ASN1_TFLG_COMBINE implementation in file tasn_dec.c related to handling malformed X509_ATTRIBUTE structures. A remote attacker can exploit this to cause a memory leak by triggering a decoding failure in a PKCS#7 or CMS application, resulting in a denial of service. (CVE-2015-3195)
A race condition exists in s3_clnt.c that is triggered when PSK identity hints are incorrectly updated in the parent SSL_CTX structure when they are received by a multi-threaded client. A remote attacker can exploit this, via a crafted ServerKeyExchange message, to cause a double-free memory error, resulting in a denial of service. (CVE-2015-3196)
A flaw exists in the ssl3_get_key_exchange() function in file s3_clnt.c when handling a ServerKeyExchange message for an anonymous DH ciphersuite with the value of ‘p’ set to 0. A attacker can exploit this, by causing a segmentation fault, to crash an application linked against the library, resulting in a denial of service.
(CVE-2015-1794)
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(88101);
script_version("1.8");
script_cvs_date("Date: 2018/07/14 1:59:36");
script_cve_id(
"CVE-2015-3193",
"CVE-2015-3194",
"CVE-2015-3195",
"CVE-2015-3196",
"CVE-2015-1794"
);
script_bugtraq_id(
78622,
78623,
78626
);
script_xref(name:"CISCO-SA", value:"cisco-sa-20151204-openssl");
script_xref(name:"IAVA", value:"2016-A-0030");
script_xref(name:"CISCO-BUG-ID", value:"CSCux41420");
script_name(english:"Mac OS X : Cisco AnyConnect Secure Mobility Client < 3.1.13015.0 / 4.2.x < 4.2.1035.0 Multiple OpenSSL Vulnerabilities");
script_summary(english:"Checks the version of the Cisco AnyConnect client.");
script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The Cisco AnyConnect Secure Mobility Client installed on the remote
Mac OS X host is a version prior to 3.1.13015.0 or 4.2.x prior to
4.2.1035.0. It is, therefore, affected by multiple vulnerabilities in
the bundled version of OpenSSL :
- A carry propagating flaw exists in the x86_64 Montgomery
squaring implementation that may cause the BN_mod_exp()
function to produce incorrect results. An attacker can
exploit this to obtain sensitive information regarding
private keys. (CVE-2015-3193)
- A NULL pointer dereference flaw exists in file
rsa_ameth.c when handling ASN.1 signatures that use the
RSA PSS algorithm but are missing a mask generation
function parameter. A remote attacker can exploit this
to cause the signature verification routine to crash,
leading to a denial of service. (CVE-2015-3194)
- A flaw exists in the ASN1_TFLG_COMBINE implementation in
file tasn_dec.c related to handling malformed
X509_ATTRIBUTE structures. A remote attacker can exploit
this to cause a memory leak by triggering a decoding
failure in a PKCS#7 or CMS application, resulting in a
denial of service. (CVE-2015-3195)
- A race condition exists in s3_clnt.c that is triggered
when PSK identity hints are incorrectly updated in the
parent SSL_CTX structure when they are received by a
multi-threaded client. A remote attacker can exploit
this, via a crafted ServerKeyExchange message, to cause
a double-free memory error, resulting in a denial of
service. (CVE-2015-3196)
- A flaw exists in the ssl3_get_key_exchange() function
in file s3_clnt.c when handling a ServerKeyExchange
message for an anonymous DH ciphersuite with the value
of 'p' set to 0. A attacker can exploit this, by causing
a segmentation fault, to crash an application linked
against the library, resulting in a denial of service.
(CVE-2015-1794)");
# http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-openssl
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4099a8d6");
script_set_attribute(attribute:"see_also", value:"https://tools.cisco.com/bugsearch/bug/CSCux41420");
script_set_attribute(attribute:"see_also", value:"https://www.openssl.org/news/secadv/20151203.txt");
script_set_attribute(attribute:"solution", value:
"Upgrade to Cisco AnyConnect Secure Mobility Client version 3.1.13015.0
/ 4.2.1035.0 or later.");
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:U/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2015/08/11");
script_set_attribute(attribute:"patch_publication_date", value:"2015/12/04");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/01/22");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:anyconnect_secure_mobility_client");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"MacOS X Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");
script_dependencies("macosx_cisco_anyconnect_installed.nasl");
script_require_keys("installed_sw/Cisco AnyConnect Secure Mobility Client", "Host/MacOSX/Version");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("install_func.inc");
get_kb_item_or_exit("Host/MacOSX/Version");
appname = "Cisco AnyConnect Secure Mobility Client";
install = get_single_install(app_name:appname, exit_if_unknown_ver:TRUE);
path = install['path'];
ver = install['version'];
fix = '';
if (ver =~ "^4\.2\." && (ver_compare(ver:ver, fix:'4.2.1035.0', strict:FALSE) < 0))
fix = '4.2.1035.0';
else if (ver_compare(ver:ver, fix:'3.1.13015.0', strict:FALSE) < 0)
fix = '3.1.13015.0';
if (!empty(fix))
{
if (report_verbosity > 0)
{
report +=
'\n Path : ' + path +
'\n Installed version : ' + ver +
'\n Fixed version : ' + fix +
'\n';
security_warning(port:0, extra:report);
}
else security_warning(0);
exit(0);
}
else audit(AUDIT_INST_PATH_NOT_VULN, appname, ver, path);
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1794
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3193
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3194
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3195
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3196
www.nessus.org/u?4099a8d6
tools.cisco.com/bugsearch/bug/CSCux41420
www.openssl.org/news/secadv/20151203.txt
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
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
EPSS
Percentile
99.4%