idn2_to_ascii_4i in lib/lookup.c in GNU libidn2 before 2.1.1 has a heap-based buffer overflow via a long domain string. (CVE-2019-18224)
GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels.
This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the inclusion of certain punycoded Unicode characters (that would be discarded when converted first to a Unicode label and then back to an ASCII label), arbitrary domains can be impersonated.(CVE-2019-12290)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2019-1327.
#
include('compat.inc');
if (description)
{
script_id(132322);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/02");
script_cve_id("CVE-2019-12290", "CVE-2019-18224");
script_xref(name:"ALAS", value:"2019-1327");
script_name(english:"Amazon Linux AMI : libidn2 (ALAS-2019-1327)");
script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux AMI host is missing a security update.");
script_set_attribute(attribute:"description", value:
"idn2_to_ascii_4i in lib/lookup.c in GNU libidn2 before 2.1.1 has a
heap-based buffer overflow via a long domain string. (CVE-2019-18224)
GNU libidn2 before 2.2.0 fails to perform the roundtrip checks
specified in RFC3490 Section 4.2 when converting A-labels to U-labels.
This makes it possible in some circumstances for one domain to
impersonate another. By creating a malicious domain that matches a
target domain except for the inclusion of certain punycoded Unicode
characters (that would be discarded when converted first to a Unicode
label and then back to an ASCII label), arbitrary domains can be
impersonated.(CVE-2019-12290)");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/ALAS-2019-1327.html");
script_set_attribute(attribute:"solution", value:
"Run 'yum update libidn2' to update your system.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
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:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-18224");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/10/21");
script_set_attribute(attribute:"patch_publication_date", value:"2019/12/19");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/20");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:idn2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libidn2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libidn2-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libidn2-devel");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (rpm_check(release:"ALA", reference:"idn2-2.3.0-1.4.amzn1", allowmaj:TRUE)) flag++;
if (rpm_check(release:"ALA", reference:"libidn2-2.3.0-1.4.amzn1", allowmaj:TRUE)) flag++;
if (rpm_check(release:"ALA", reference:"libidn2-debuginfo-2.3.0-1.4.amzn1", allowmaj:TRUE)) flag++;
if (rpm_check(release:"ALA", reference:"libidn2-devel-2.3.0-1.4.amzn1", allowmaj:TRUE)) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
else security_hole(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "idn2 / libidn2 / libidn2-debuginfo / libidn2-devel");
}