Ubuntu: Security Advisory (USN-5067-1)

# SPDX-FileCopyrightText: 2021 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.845048");
  script_cve_id("CVE-2018-10852", "CVE-2018-16838", "CVE-2019-3811", "CVE-2021-3621");
  script_tag(name:"creation_date", value:"2021-09-09 01:00:40 +0000 (Thu, 09 Sep 2021)");
  script_version("2024-02-02T05:06:08+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:08 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"9.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-01-07 16:18:21 +0000 (Fri, 07 Jan 2022)");

  script_name("Ubuntu: Security Advisory (USN-5067-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Ubuntu Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/ubuntu_linux", "ssh/login/packages", re:"ssh/login/release=UBUNTU(18\.04\ LTS|20\.04\ LTS|21\.04)");

  script_xref(name:"Advisory-ID", value:"USN-5067-1");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-5067-1");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'sssd' package(s) announced via the USN-5067-1 advisory.");

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

  script_tag(name:"insight", value:"Jakub Hrozek discovered that SSSD incorrectly handled file permissions. A
local attacker could possibly use this issue to read the sudo rules
available for any user. This issue only affected Ubuntu 18.04 LTS.
(CVE-2018-10852)

It was discovered that SSSD incorrectly handled Group Policy Objects. When
SSSD is configured with too strict permissions causing the GPO to not be
readable, SSSD will allow all authenticated users to login instead of being
denied, contrary to expectations. This issue only affected Ubuntu 18.04
LTS. (CVE-2018-16838)

It was discovered that SSSD incorrectly handled users with no home
directory set. When no home directory was set, SSSD would return the root
directory instead of an empty string, possibly bypassing security measures.
This issue only affected Ubuntu 18.04 LTS. (CVE-2019-3811)

Cedric Buissart discovered that SSSD incorrectly handled the sssctl
command. In certain environments, a local user could use this issue to
execute arbitrary commands and possibly escalate privileges.
(CVE-2021-3621)");

  script_tag(name:"affected", value:"'sssd' package(s) on Ubuntu 18.04, Ubuntu 20.04, Ubuntu 21.04.");

  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-deb.inc");

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

res = "";
report = "";

if(release == "UBUNTU18.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"sssd", ver:"1.16.1-1ubuntu1.8", rls:"UBUNTU18.04 LTS"))) {
    report += res;
  }

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

if(release == "UBUNTU20.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"sssd", ver:"2.2.3-3ubuntu0.7", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

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

if(release == "UBUNTU21.04") {

  if(!isnull(res = isdpkgvuln(pkg:"sssd", ver:"2.4.0-1ubuntu6.1", rls:"UBUNTU21.04"))) {
    report += res;
  }

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

exit(0);