Ubuntu: Security Advisory (USN-4980-1)

# 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("1.3.6.1.4.1.25623.1.0.844968");
  script_cve_id("CVE-2021-3560");
  script_tag(name:"creation_date", value:"2021-06-04 03:00:41 +0000 (Fri, 04 Jun 2021)");
  script_version("2024-08-08T05:05:41+0000");
  script_tag(name:"last_modification", value:"2024-08-08 05:05:41 +0000 (Thu, 08 Aug 2024)");
  script_tag(name:"cvss_base", value:"7.2");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-02-28 15:49:13 +0000 (Mon, 28 Feb 2022)");

  script_name("Ubuntu: Security Advisory (USN-4980-1)");
  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(20\.04\ LTS|20\.10|21\.04)");

  script_xref(name:"Advisory-ID", value:"USN-4980-1");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-4980-1");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'policykit-1' package(s) announced via the USN-4980-1 advisory.");

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

  script_tag(name:"insight", value:"Kevin Backhouse discovered that polkit incorrectly handled errors in the
polkit_system_bus_name_get_creds_sync function. A local attacker could
possibly use this issue to escalate privileges.");

  script_tag(name:"affected", value:"'policykit-1' package(s) on Ubuntu 20.04, Ubuntu 20.10, 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");
  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");

  exit(0);
}

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

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

res = "";
report = "";

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

  if(!isnull(res = isdpkgvuln(pkg:"libpolkit-agent-1-0", ver:"0.105-26ubuntu1.1", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"libpolkit-gobject-1-0", ver:"0.105-26ubuntu1.1", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"policykit-1", ver:"0.105-26ubuntu1.1", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

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

if(release == "UBUNTU20.10") {

  if(!isnull(res = isdpkgvuln(pkg:"libpolkit-agent-1-0", ver:"0.105-29ubuntu0.1", rls:"UBUNTU20.10"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"libpolkit-gobject-1-0", ver:"0.105-29ubuntu0.1", rls:"UBUNTU20.10"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"policykit-1", ver:"0.105-29ubuntu0.1", rls:"UBUNTU20.10"))) {
    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:"libpolkit-agent-1-0", ver:"0.105-30ubuntu0.1", rls:"UBUNTU21.04"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"libpolkit-gobject-1-0", ver:"0.105-30ubuntu0.1", rls:"UBUNTU21.04"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"policykit-1", ver:"0.105-30ubuntu0.1", rls:"UBUNTU21.04"))) {
    report += res;
  }

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

exit(0);