Amazon Linux AMI : systemtap (ALAS-2012-54)

2013-09-04T00:00:00
ID ALA_ALAS-2012-54.NASL
Type nessus
Reporter This script is Copyright (C) 2013-2018 Tenable Network Security, Inc.
Modified 2020-04-02T00:00:00

Description

An invalid pointer read flaw was found in the way SystemTap handled malformed debugging information in DWARF format. When SystemTap unprivileged mode was enabled, an unprivileged user in the stapusr group could use this flaw to crash the system or, potentially, read arbitrary kernel memory. Additionally, a privileged user (root, or a member of the stapdev group) could trigger this flaw when tricked into instrumenting a specially crafted ELF binary, even when unprivileged mode was not enabled. (CVE-2012-0875)

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2012-54.
#

include("compat.inc");

if (description)
{
  script_id(69661);
  script_version("1.8");
  script_cvs_date("Date: 2018/04/18 15:09:34");

  script_cve_id("CVE-2012-0875");
  script_xref(name:"ALAS", value:"2012-54");
  script_xref(name:"RHSA", value:"2012:0376");

  script_name(english:"Amazon Linux AMI : systemtap (ALAS-2012-54)");
  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:
"An invalid pointer read flaw was found in the way SystemTap handled
malformed debugging information in DWARF format. When SystemTap
unprivileged mode was enabled, an unprivileged user in the stapusr
group could use this flaw to crash the system or, potentially, read
arbitrary kernel memory. Additionally, a privileged user (root, or a
member of the stapdev group) could trigger this flaw when tricked into
instrumenting a specially crafted ELF binary, even when unprivileged
mode was not enabled. (CVE-2012-0875)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2012-54.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update systemtap' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:C");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:systemtap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:systemtap-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:systemtap-initscript");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:systemtap-runtime");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:systemtap-sdt-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:systemtap-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:systemtap-testsuite");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2012/03/15");
  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:"systemtap-1.6-5.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"systemtap-debuginfo-1.6-5.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"systemtap-initscript-1.6-5.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"systemtap-runtime-1.6-5.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"systemtap-sdt-devel-1.6-5.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"systemtap-server-1.6-5.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"systemtap-testsuite-1.6-5.12.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, "systemtap / systemtap-debuginfo / systemtap-initscript / etc");
}