It was discovered that Ruby’s REXML library did not properly restrict XML entity expansion. An attacker could use this flaw to cause a denial of service by tricking a Ruby application using REXML to read text nodes from specially crafted XML content, which will result in REXML consuming large amounts of system memory. (CVE-2013-1821)
It was found that the RHSA-2011-0910 update did not correctly fix the CVE-2011-1005 issue, a flaw in the method for translating an exception message into a string in the Exception class. A remote attacker could use this flaw to bypass safe level 4 restrictions, allowing untrusted (tainted) code to modify arbitrary, trusted (untainted) strings, which safe level 4 restrictions would otherwise prevent. (CVE-2012-4481)
The safe-level feature in Ruby 1.8.6 through 1.8.6-420, 1.8.7 through 1.8.7-330, and 1.8.8dev allows context-dependent attackers to modify strings via the Exception#to_s method, as demonstrated by changing an intended pathname. (CVE-2011-1005)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2013-173.
#
include("compat.inc");
if (description)
{
script_id(69732);
script_version("1.6");
script_cvs_date("Date: 2018/04/18 15:09:35");
script_cve_id("CVE-2011-1005", "CVE-2012-4481", "CVE-2013-1821");
script_xref(name:"ALAS", value:"2013-173");
script_xref(name:"RHSA", value:"2013:0612");
script_name(english:"Amazon Linux AMI : ruby (ALAS-2013-173)");
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:
"It was discovered that Ruby's REXML library did not properly restrict
XML entity expansion. An attacker could use this flaw to cause a
denial of service by tricking a Ruby application using REXML to read
text nodes from specially crafted XML content, which will result in
REXML consuming large amounts of system memory. (CVE-2013-1821)
It was found that the RHSA-2011-0910 update did not correctly fix the
CVE-2011-1005 issue, a flaw in the method for translating an exception
message into a string in the Exception class. A remote attacker could
use this flaw to bypass safe level 4 restrictions, allowing untrusted
(tainted) code to modify arbitrary, trusted (untainted) strings, which
safe level 4 restrictions would otherwise prevent. (CVE-2012-4481)
The safe-level feature in Ruby 1.8.6 through 1.8.6-420, 1.8.7 through
1.8.7-330, and 1.8.8dev allows context-dependent attackers to modify
strings via the Exception#to_s method, as demonstrated by changing an
intended pathname. (CVE-2011-1005)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2013-173.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update ruby' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-irb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-rdoc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-ri");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-static");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2013/03/14");
script_set_attribute(attribute:"plugin_publication_date", value:"2013/09/04");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2013-2018 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:"ruby-1.8.7.371-2.25.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby-debuginfo-1.8.7.371-2.25.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby-devel-1.8.7.371-2.25.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby-irb-1.8.7.371-2.25.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby-libs-1.8.7.371-2.25.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby-rdoc-1.8.7.371-2.25.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby-ri-1.8.7.371-2.25.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby-static-1.8.7.371-2.25.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, "ruby / ruby-debuginfo / ruby-devel / ruby-irb / ruby-libs / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | ruby | p-cpe:/a:amazon:linux:ruby |
amazon | linux | ruby-debuginfo | p-cpe:/a:amazon:linux:ruby-debuginfo |
amazon | linux | ruby-devel | p-cpe:/a:amazon:linux:ruby-devel |
amazon | linux | ruby-irb | p-cpe:/a:amazon:linux:ruby-irb |
amazon | linux | ruby-libs | p-cpe:/a:amazon:linux:ruby-libs |
amazon | linux | ruby-rdoc | p-cpe:/a:amazon:linux:ruby-rdoc |
amazon | linux | ruby-ri | p-cpe:/a:amazon:linux:ruby-ri |
amazon | linux | ruby-static | p-cpe:/a:amazon:linux:ruby-static |
amazon | linux | cpe:/o:amazon:linux |