The yaml_parser_scan_tag_uri function in scanner.c in LibYAML before 0.1.5 performs an incorrect cast, which allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted tags in a YAML document, which triggers a heap-based buffer overflow.
Heap-based buffer overflow in the yaml_parser_scan_uri_escapes function in LibYAML before 0.1.6 allows context-dependent attackers to execute arbitrary code via a long sequence of percent-encoded characters in a URI in a YAML file.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2014-324.
#
include("compat.inc");
if (description)
{
script_id(73652);
script_version("1.5");
script_cvs_date("Date: 2018/04/18 15:09:35");
script_cve_id("CVE-2013-6393", "CVE-2014-2525");
script_xref(name:"ALAS", value:"2014-324");
script_name(english:"Amazon Linux AMI : perl-YAML-LibYAML (ALAS-2014-324)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux AMI host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"The yaml_parser_scan_tag_uri function in scanner.c in LibYAML before
0.1.5 performs an incorrect cast, which allows remote attackers to
cause a denial of service (application crash) and possibly execute
arbitrary code via crafted tags in a YAML document, which triggers a
heap-based buffer overflow.
Heap-based buffer overflow in the yaml_parser_scan_uri_escapes
function in LibYAML before 0.1.6 allows context-dependent attackers to
execute arbitrary code via a long sequence of percent-encoded
characters in a URI in a YAML file."
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2014-324.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update perl-YAML-LibYAML' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perl-YAML-LibYAML");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perl-YAML-LibYAML-debuginfo");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2014/04/17");
script_set_attribute(attribute:"plugin_publication_date", value:"2014/04/23");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2014-2018 Tenable Network Security, Inc.");
script_family(english:"Amazon Linux Local Security Checks");
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:"perl-YAML-LibYAML-0.41-4.9.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"perl-YAML-LibYAML-debuginfo-0.41-4.9.amzn1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
else security_warning(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "perl-YAML-LibYAML / perl-YAML-LibYAML-debuginfo");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | perl-yaml-libyaml | p-cpe:/a:amazon:linux:perl-yaml-libyaml |
amazon | linux | perl-yaml-libyaml-debuginfo | p-cpe:/a:amazon:linux:perl-yaml-libyaml-debuginfo |
amazon | linux | cpe:/o:amazon:linux |