A missing access control flaw was found in Samba. A remote, authenticated attacker could use this flaw to view the current snapshot on a Samba share, despite not having DIRECTORY_LIST access rights.
An access flaw was found in the way Samba verified symbolic links when creating new files on a Samba share. A remote attacker could exploit this flaw to gain access to files outside of Samba’s share path.
A memory-read flaw was found in the way the libldb library processed LDB DN records with a null byte. An authenticated, remote attacker could use this flaw to read heap-memory pages from the server.
A man-in-the-middle vulnerability was found in the way ‘connection signing’ was implemented by Samba. A remote attacker could use this flaw to downgrade an existing Samba client connection and force the use of plain text.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2016-634.
#
include("compat.inc");
if (description)
{
script_id(87968);
script_version("2.6");
script_cvs_date("Date: 2018/04/18 15:09:35");
script_cve_id("CVE-2015-5252", "CVE-2015-5296", "CVE-2015-5299", "CVE-2015-5330");
script_xref(name:"ALAS", value:"2016-634");
script_name(english:"Amazon Linux AMI : samba (ALAS-2016-634)");
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:
"A missing access control flaw was found in Samba. A remote,
authenticated attacker could use this flaw to view the current
snapshot on a Samba share, despite not having DIRECTORY_LIST access
rights.
An access flaw was found in the way Samba verified symbolic links when
creating new files on a Samba share. A remote attacker could exploit
this flaw to gain access to files outside of Samba's share path.
A memory-read flaw was found in the way the libldb library processed
LDB DN records with a null byte. An authenticated, remote attacker
could use this flaw to read heap-memory pages from the server.
A man-in-the-middle vulnerability was found in the way 'connection
signing' was implemented by Samba. A remote attacker could use this
flaw to downgrade an existing Samba client connection and force the
use of plain text."
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2016-634.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:N/I:P/A:N");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
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-devel");
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-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-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-test");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:samba-test-devel");
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-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");
script_set_attribute(attribute:"patch_publication_date", value:"2016/01/18");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/01/19");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2016-2018 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:"ctdb-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ctdb-devel-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ctdb-tests-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libsmbclient-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libsmbclient-devel-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libwbclient-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libwbclient-devel-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-client-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-client-libs-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-common-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-common-libs-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-common-tools-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-debuginfo-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-devel-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-libs-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-pidl-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-python-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-test-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-test-devel-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-test-libs-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-winbind-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-winbind-clients-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-winbind-krb5-locator-4.2.3-11.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"samba-winbind-modules-4.2.3-11.28.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, "ctdb / ctdb-devel / ctdb-tests / libsmbclient / libsmbclient-devel / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | ctdb | p-cpe:/a:amazon:linux:ctdb |
amazon | linux | ctdb-devel | p-cpe:/a:amazon:linux:ctdb-devel |
amazon | linux | ctdb-tests | p-cpe:/a:amazon:linux:ctdb-tests |
amazon | linux | libsmbclient | p-cpe:/a:amazon:linux:libsmbclient |
amazon | linux | libsmbclient-devel | p-cpe:/a:amazon:linux:libsmbclient-devel |
amazon | linux | libwbclient | p-cpe:/a:amazon:linux:libwbclient |
amazon | linux | libwbclient-devel | p-cpe:/a:amazon:linux:libwbclient-devel |
amazon | linux | samba | p-cpe:/a:amazon:linux:samba |
amazon | linux | samba-client | p-cpe:/a:amazon:linux:samba-client |
amazon | linux | samba-client-libs | p-cpe:/a:amazon:linux:samba-client-libs |