Isaac Boukris and Andrew Bartlett discovered that the S4U2Self Kerberos extension used in Samba’s Active Directory support was susceptible to man-in-the-middle attacks caused by incomplete checksum validation.
Details can be found in the upstream advisory at
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DSA-4443. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include("compat.inc");
if (description)
{
script_id(125094);
script_version("1.5");
script_cvs_date("Date: 2020/01/17");
script_cve_id("CVE-2018-16860");
script_xref(name:"DSA", value:"4443");
script_name(english:"Debian DSA-4443-1 : samba - security update");
script_summary(english:"Checks dpkg output for the updated package");
script_set_attribute(
attribute:"synopsis",
value:"The remote Debian host is missing a security-related update."
);
script_set_attribute(
attribute:"description",
value:
"Isaac Boukris and Andrew Bartlett discovered that the S4U2Self
Kerberos extension used in Samba's Active Directory support was
susceptible to man-in-the-middle attacks caused by incomplete checksum
validation.
Details can be found in the upstream advisory at"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/source-package/samba"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/stretch/samba"
);
script_set_attribute(
attribute:"see_also",
value:"https://www.debian.org/security/2019/dsa-4443"
);
script_set_attribute(
attribute:"solution",
value:
"Upgrade the samba packages.
For the stable distribution (stretch), this problem has been fixed in
version 2:4.5.16+dfsg-1+deb9u2."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/07/31");
script_set_attribute(attribute:"patch_publication_date", value:"2019/05/14");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/05/15");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Debian Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
exit(0);
}
include("audit.inc");
include("debian_package.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (deb_check(release:"9.0", prefix:"ctdb", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libnss-winbind", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libpam-winbind", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libparse-pidl-perl", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libsmbclient", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libsmbclient-dev", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libwbclient-dev", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libwbclient0", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"python-samba", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"registry-tools", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"samba", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"samba-common", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"samba-common-bin", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"samba-dev", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"samba-dsdb-modules", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"samba-libs", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"samba-testsuite", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"samba-vfs-modules", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"smbclient", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"winbind", reference:"2:4.5.16+dfsg-1+deb9u2")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
else security_warning(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
Vendor | Product | Version | CPE |
---|---|---|---|
debian | debian_linux | samba | p-cpe:/a:debian:debian_linux:samba |
debian | debian_linux | 9.0 | cpe:/o:debian:debian_linux:9.0 |