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
EPSS
Percentile
77.8%
According to its self-reported version, the Cisco AsyncOS running on the remote Cisco Email Security (ESA) appliance is affected by the following vulnerabilities :
An anti-spam bypass vulnerability exists in the anti-spam scanner due to improper handling of malformed packets. An unauthenticated, remote attacker can exploit this, via a crafted DNS Sender Policy Framework (SPF) record, to bypass the scanner. (CVE-2015-4184)
A denial of service vulnerability exists in the email filtering feature due to improper input validation of email attachment fields. An unauthenticated, remote attacker can exploit this, via a crafted email with an attachment, to cause memory to be consumed at a high rate, resulting in the filtering process being restarted over again. (CVE-2015-6291)
A denial of service vulnerability exists due to improper handling of TCP packets sent at a high rate. An unauthenticated, remote attacker can exploit this to exhaust all available memory, preventing any more TCP connections from being accepted. (CVE-2015-6321)
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(86914);
script_version("1.11");
script_set_attribute(attribute:"plugin_modification_date", value:"2020/02/28");
script_cve_id("CVE-2015-4184", "CVE-2015-6291", "CVE-2015-6321");
script_bugtraq_id(75181);
script_xref(name:"CISCO-BUG-ID", value:"CSCuu35853");
script_xref(name:"CISCO-BUG-ID", value:"CSCuu37733");
script_xref(name:"CISCO-BUG-ID", value:"CSCuv47151");
script_xref(name:"CISCO-BUG-ID", value:"CSCus79774");
script_xref(name:"CISCO-SA", value:"cisco-sa-20150612-esa");
script_xref(name:"CISCO-SA", value:"cisco-sa-20151104-esa2");
script_xref(name:"CISCO-SA", value:"cisco-sa-20151104-aos");
script_name(english:"Cisco Email Security Appliance Multiple Vulnerabilities");
script_summary(english:"Checks the ESA version.");
script_set_attribute(attribute:"synopsis", value:
"The remote security appliance is missing a vendor-supplied security
patch.");
script_set_attribute(attribute:"description", value:
"According to its self-reported version, the Cisco AsyncOS running on
the remote Cisco Email Security (ESA) appliance is affected by the
following vulnerabilities :
- An anti-spam bypass vulnerability exists in the anti-spam
scanner due to improper handling of malformed packets. An
unauthenticated, remote attacker can exploit this, via
a crafted DNS Sender Policy Framework (SPF) record, to
bypass the scanner. (CVE-2015-4184)
- A denial of service vulnerability exists in the email
filtering feature due to improper input validation of
email attachment fields. An unauthenticated, remote
attacker can exploit this, via a crafted email with an
attachment, to cause memory to be consumed at a high
rate, resulting in the filtering process being restarted
over again. (CVE-2015-6291)
- A denial of service vulnerability exists due to improper
handling of TCP packets sent at a high rate. An
unauthenticated, remote attacker can exploit this to
exhaust all available memory, preventing any more
TCP connections from being accepted. (CVE-2015-6321)");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150612-esa
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fa713eb4");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151104-esa2
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?21ab6cfa");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151104-aos
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?561dad7b");
script_set_attribute(attribute:"solution", value:
"Apply the relevant updates referenced in Cisco Security Advisories
cisco-sa-20150612-esa, cisco-sa-20151104-esa2, and
cisco-sa-20151104-aos.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-4184");
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:"2015/06/12");
script_set_attribute(attribute:"patch_publication_date", value:"2015/06/12");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/11/18");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/h:cisco:email_security_appliance");
script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:email_security_appliance_firmware");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CISCO");
script_copyright(english:"This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("cisco_esa_version.nasl");
script_require_keys("Host/AsyncOS/Cisco Email Security Appliance/DisplayVersion", "Host/AsyncOS/Cisco Email Security Appliance/Version");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
display_ver = get_kb_item_or_exit('Host/AsyncOS/Cisco Email Security Appliance/DisplayVersion');
ver = get_kb_item_or_exit('Host/AsyncOS/Cisco Email Security Appliance/Version');
if (ver =~ "^[0-7]\.") # Prior to 8.0
display_fix = '8.5.7-043';
else if (ver =~ "^8\.0\.2\.")
display_fix = '9.1.1-023';
else if (ver =~ "^8\.0\.[01]\.") # 8.0 and 8.0.1
display_fix = '8.5.7-043';
else if (ver =~ "^8\.5\.")
display_fix = '8.5.7-043';
else if (ver =~ "^9\.0\.")
display_fix = '9.1.1-023';
else if (ver =~ "^9\.1\.")
display_fix = '9.1.1-023';
else if (ver =~ "^9\.5\.")
display_fix = '9.6.0-046';
else if (ver =~ "^9\.6\.")
display_fix = '9.6.0-046';
else
audit(AUDIT_INST_VER_NOT_VULN, 'Cisco ESA', display_ver);
fix = str_replace(string:display_fix, find:'-', replace:'.');
if (ver_compare(ver:ver, fix:fix, strict:FALSE) == -1)
{
if (report_verbosity > 0)
{
report =
'\n Installed version : ' + display_ver +
'\n Fixed version : ' + display_fix +
'\n';
security_warning(port:0, extra:report);
}
else security_warning(0);
exit(0);
}
else audit(AUDIT_INST_VER_NOT_VULN, 'Cisco ESA', display_ver);