Amazon Linux 2 : samba (ALAS-2020-1459)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2020-1459.
#

include('compat.inc');

if (description)
{
  script_id(138625);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/29");

  script_cve_id("CVE-2019-10197", "CVE-2019-10218");
  script_xref(name:"ALAS", value:"2020-1459");

  script_name(english:"Amazon Linux 2 : samba (ALAS-2020-1459)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"A flaw was found in the samba client, all samba versions before samba
4.11.2, 4.10.10 and 4.9.15, where a malicious server can supply a
pathname to the client with separators. This could allow the client to
access files and folders outside of the SMB network pathnames. An
attacker could use this vulnerability to create files outside of the
current working directory using the privileges of the client user.
(CVE-2019-10218)

A flaw was found in samba versions 4.9.x up to 4.9.13, samba 4.10.x up
to 4.10.8 and samba 4.11.x up to 4.11.0rc3, when certain parameters
were set in the samba configuration file. An unauthenticated attacker
could use this flaw to escape the shared directory and access the
contents of directories outside the share. (CVE-2019-10197)");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2020-1459.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update samba' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-10197");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/09/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ctdb-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsmbclient-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libwbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libwbclient-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-client-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-common-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-common-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-dc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-dc-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-krb5-printing");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-pidl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-python-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-test-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-vfs-glusterfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-winbind-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-winbind-krb5-locator");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-winbind-modules");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  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) 2020-2024 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 != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (rpm_check(release:"AL2", reference:"ctdb-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"ctdb-tests-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"libsmbclient-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"libsmbclient-devel-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"libwbclient-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"libwbclient-devel-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-client-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-client-libs-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-common-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-common-libs-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-common-tools-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-dc-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-dc-libs-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-debuginfo-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-devel-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-krb5-printing-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-libs-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-pidl-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-python-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-python-test-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-test-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-test-libs-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", cpu:"x86_64", reference:"samba-vfs-glusterfs-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-winbind-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-winbind-clients-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-winbind-krb5-locator-4.10.4-11.amzn2.0.1")) flag++;
if (rpm_check(release:"AL2", reference:"samba-winbind-modules-4.10.4-11.amzn2.0.1")) 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, "ctdb / ctdb-tests / libsmbclient / libsmbclient-devel / libwbclient / etc");
}