CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
EPSS
Percentile
85.0%
According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by a vulnerability that could allow a remote, authenticated attacker to crash the server.
If two remote users interact with a single voicemail account in unspecified ways, memory can be corrupted by a double-free vulnerability and this can further lead to application crashes.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(60065);
script_version("1.11");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");
script_cve_id("CVE-2012-3812");
script_bugtraq_id(54317);
script_name(english:"Asterisk Multiple Caller Simultaneous Voicemail Account Manipulation Double-free Remote DoS (AST-2012-011)");
script_set_attribute(attribute:"synopsis", value:
"A telephony application running on the remote host is affected by a
denial of service vulnerability.");
script_set_attribute(attribute:"description", value:
"According to the version in its SIP banner, the version of Asterisk
running on the remote host is potentially affected by a vulnerability
that could allow a remote, authenticated attacker to crash the server.
If two remote users interact with a single voicemail account in
unspecified ways, memory can be corrupted by a double-free vulnerability and this
can further lead to application crashes.");
script_set_attribute(attribute:"see_also", value:"http://downloads.asterisk.org/pub/security/AST-2012-011.html");
script_set_attribute(attribute:"see_also", value:"https://issues.asterisk.org/jira/browse/ASTERISK-20052");
script_set_attribute(attribute:"solution", value:
"Upgrade to Asterisk 1.8.13.1 / 10.5.2, Certified Asterisk 1.8.11-cert4
or apply the patches listed in the Asterisk advisory.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P");
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:"2012/06/27");
script_set_attribute(attribute:"patch_publication_date", value:"2012/06/27");
script_set_attribute(attribute:"plugin_publication_date", value:"2012/07/19");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:digium:asterisk");
script_set_attribute(attribute:"thorough_tests", value:"true");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2012-2022 Tenable Network Security, Inc.");
script_dependencies("asterisk_detection.nasl");
script_require_keys("asterisk/sip_detected", "Settings/ParanoidReport");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
get_kb_item_or_exit("asterisk/sip_detected");
# see if we were able to get version info from the Asterisk SIP services
asterisk_kbs = get_kb_list("sip/asterisk/*/version");
if (isnull(asterisk_kbs)) exit(1, "Could not obtain any version information from the Asterisk SIP instance(s).");
# Prevent potential false positives.
if (report_paranoia < 2) audit(AUDIT_PARANOID);
is_vuln = FALSE;
not_vuln_installs = make_list();
errors = make_list();
foreach kb_name (keys(asterisk_kbs))
{
vulnerable = 0;
matches = eregmatch(pattern:"/(udp|tcp)/([0-9]+)/version", string:kb_name);
if (isnull(matches))
{
errors = make_list(errors, "Unexpected error parsing port number from kb name: "+kb_name);
continue;
}
proto = matches[1];
port = matches[2];
version = asterisk_kbs[kb_name];
if (version == 'unknown')
{
errors = make_list(errors, "Unable to obtain version of install on " + proto + "/" + port);
continue;
}
banner = get_kb_item("sip/asterisk/" + proto + "/" + port + "/source");
if (!banner)
{
# We have version but banner is missing; log error
# and use in version-check though.
errors = make_list(errors, "KB item 'sip/asterisk/" + proto + "/" + port + "/source' is missing");
banner = 'unknown';
}
# Open Source 10x < 10.5.2
if (version =~ "^10([^0-9]|$)" && "cert" >!< tolower(version))
{
fixed = "10.5.2";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
# Open Source 1.8.x < 1.8.13.1
if (version =~ "^1\.8([^0-9]|$)" && "cert" >!< tolower(version))
{
fixed = "1.8.13.1";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
# Asterisk Certified 1.8.11-certx < 1.8.11-cert4
if (version =~ "^1\.8\.11([^0-9]|$)" && "cert" >< tolower(version))
{
fixed = "1.8.11-cert4";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
if (vulnerable < 0)
{
is_vuln = TRUE;
if (report_verbosity > 0)
{
report =
'\n Version source : ' + banner +
'\n Installed version : ' + version +
'\n Fixed version : ' + fixed + '\n';
security_warning(port:port, proto:proto, extra:report);
}
else security_warning(port:port, proto:proto);
}
else not_vuln_installs = make_list(not_vuln_installs, version + " on port " + proto + "/" + port);
}
if (max_index(errors))
{
if (max_index(errors) == 1) errmsg = errors[0];
else errmsg = 'Errors were encountered verifying installs : \n ' + join(errors, sep:'\n ');
exit(1, errmsg);
}
else
{
installs = max_index(not_vuln_installs);
if (installs == 0)
{
if (is_vuln)
exit(0);
else
audit(AUDIT_NOT_INST, "Asterisk");
}
else if (installs == 1) audit(AUDIT_INST_VER_NOT_VULN, "Asterisk " + not_vuln_installs[0]);
else exit(0, "The Asterisk installs (" + join(not_vuln_installs, sep:", ") + ") are not affected.");
}