Several vulnerabilities were discovered in Asterisk, a PBX and telephony toolkit.
CVE-2012-2947 The IAX2 channel driver allows remote attackers to cause a denial of service (daemon crash) by placing a call on hold (when a certain mohinterpret setting is enabled).
CVE-2012-2948 The Skinny channel driver allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) by closing a connection in off-hook mode.
In addition, it was discovered that Asterisk does not set the alwaysauthreject option by default in the SIP channel driver. This allows remote attackers to observe a difference in response behavior and check for the presence of account names. (CVE-2011-2666 ) System administrators concerned by this user enumerating vulnerability should enable the alwaysauthreject option in the configuration. We do not plan to change the default setting in the stable version (Asterisk 1.6) in order to preserve backwards compatibility.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DSA-2493. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(59771);
script_version("1.12");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");
script_cve_id("CVE-2012-2947", "CVE-2012-2948");
script_bugtraq_id(53722, 53723);
script_xref(name:"DSA", value:"2493");
script_name(english:"Debian DSA-2493-1 : asterisk - denial of service");
script_summary(english:"Checks dpkg output for the updated package");
script_set_attribute(
attribute:"synopsis",
value:"The remote Debian host is missing a security-related update."
);
script_set_attribute(
attribute:"description",
value:
"Several vulnerabilities were discovered in Asterisk, a PBX and
telephony toolkit.
- CVE-2012-2947
The IAX2 channel driver allows remote attackers to cause
a denial of service (daemon crash) by placing a call on
hold (when a certain mohinterpret setting is enabled).
- CVE-2012-2948
The Skinny channel driver allows remote authenticated
users to cause a denial of service (NULL pointer
dereference and daemon crash) by closing a connection in
off-hook mode.
In addition, it was discovered that Asterisk does not set the
alwaysauthreject option by default in the SIP channel driver. This
allows remote attackers to observe a difference in response behavior
and check for the presence of account names. (CVE-2011-2666 ) System
administrators concerned by this user enumerating vulnerability should
enable the alwaysauthreject option in the configuration. We do not
plan to change the default setting in the stable version (Asterisk
1.6) in order to preserve backwards compatibility."
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=675204"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=675210"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2012-2947"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2012-2948"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2011-2666"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/squeeze/asterisk"
);
script_set_attribute(
attribute:"see_also",
value:"https://www.debian.org/security/2012/dsa-2493"
);
script_set_attribute(
attribute:"solution",
value:
"Upgrade the asterisk packages.
For the stable distribution (squeeze), this problem has been fixed in
version 1:1.6.2.9-2+squeeze6."
);
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:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");
script_set_attribute(attribute:"patch_publication_date", value:"2012/06/12");
script_set_attribute(attribute:"plugin_publication_date", value:"2012/06/29");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2012-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Debian Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
exit(0);
}
include("audit.inc");
include("debian_package.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (deb_check(release:"6.0", prefix:"asterisk", reference:"1:1.6.2.9-2+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-config", reference:"1:1.6.2.9-2+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-dbg", reference:"1:1.6.2.9-2+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-dev", reference:"1:1.6.2.9-2+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-doc", reference:"1:1.6.2.9-2+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-h323", reference:"1:1.6.2.9-2+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-sounds-main", reference:"1:1.6.2.9-2+squeeze6")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
else security_warning(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
Vendor | Product | Version | CPE |
---|---|---|---|
debian | debian_linux | asterisk | p-cpe:/a:debian:debian_linux:asterisk |
debian | debian_linux | 6.0 | cpe:/o:debian:debian_linux:6.0 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2947
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2948
bugs.debian.org/cgi-bin/bugreport.cgi?bug=675204
bugs.debian.org/cgi-bin/bugreport.cgi?bug=675210
packages.debian.org/source/squeeze/asterisk
security-tracker.debian.org/tracker/CVE-2011-2666
security-tracker.debian.org/tracker/CVE-2012-2947
security-tracker.debian.org/tracker/CVE-2012-2948
www.debian.org/security/2012/dsa-2493