Huawei EulerOS: Security Advisory for systemd (EulerOS-SA-2019-2319)

# Copyright (C) 2020 Greenbone Networks GmbH
# Text descriptions are largely excerpted from the referenced
# advisory, and are Copyright (C) the respective author(s)
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.1.2.2019.2319");
  script_version("2020-01-23T12:47:00+0000");
  script_cve_id("CVE-2019-3843", "CVE-2019-3844");
  script_tag(name:"cvss_base", value:"4.6");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"2020-01-23 12:47:00 +0000 (Thu, 23 Jan 2020)");
  script_tag(name:"creation_date", value:"2020-01-23 12:47:00 +0000 (Thu, 23 Jan 2020)");
  script_name("Huawei EulerOS: Security Advisory for systemd (EulerOS-SA-2019-2319)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  script_family("Huawei EulerOS Local Security Checks");
  script_dependencies("gb_huawei_euleros_consolidation.nasl");
  script_mandatory_keys("ssh/login/euleros", "ssh/login/rpms", re:"ssh/login/release=EULEROSVIRTARM64-3\.0\.3\.0");

  script_xref(name:"EulerOS-SA", value:"2019-2319");
  script_xref(name:"URL", value:"https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2019-2319");

  script_tag(name:"summary", value:"The remote host is missing an update for the Huawei EulerOS
  'systemd' package(s) announced via the EulerOS-SA-2019-2319 advisory.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that would be allowed to run as the transient service UID/GID even after the service is terminated. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the UID/GID will be recycled.(CVE-2019-3843)

It was discovered that a systemd service that uses DynamicUser property can get new privileges through the execution of SUID binaries, which would allow to create binaries owned by the service transient group with the setgid bit set. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the GID will be recycled.(CVE-2019-3844)");

  script_tag(name:"affected", value:"'systemd' package(s) on Huawei EulerOS Virtualization for ARM 64 3.0.3.0.");

  script_tag(name:"solution", value:"Please install the updated package(s).");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"package");

  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-rpm.inc");

release = rpm_get_ssh_release();
if(!release)
  exit(0);

res = "";
report = "";

if(release == "EULEROSVIRTARM64-3.0.3.0") {

  if(!isnull(res = isrpmvuln(pkg:"systemd", rpm:"systemd~239~3.h56.eulerosv2r8", rls:"EULEROSVIRTARM64-3.0.3.0"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"systemd-container", rpm:"systemd-container~239~3.h56.eulerosv2r8", rls:"EULEROSVIRTARM64-3.0.3.0"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"systemd-devel", rpm:"systemd-devel~239~3.h56.eulerosv2r8", rls:"EULEROSVIRTARM64-3.0.3.0"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"systemd-journal-remote", rpm:"systemd-journal-remote~239~3.h56.eulerosv2r8", rls:"EULEROSVIRTARM64-3.0.3.0"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"systemd-libs", rpm:"systemd-libs~239~3.h56.eulerosv2r8", rls:"EULEROSVIRTARM64-3.0.3.0"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"systemd-pam", rpm:"systemd-pam~239~3.h56.eulerosv2r8", rls:"EULEROSVIRTARM64-3.0.3.0"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"systemd-udev", rpm:"systemd-udev~239~3.h56.eulerosv2r8", rls:"EULEROSVIRTARM64-3.0.3.0"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"systemd-udev-compat", rpm:"systemd-udev-compat~239~3.h56.eulerosv2r8", rls:"EULEROSVIRTARM64-3.0.3.0"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if (__pkg_match) {
    exit(99);
  }
  exit(0);
}

exit(0);