Ubuntu: Security Advisory (USN-4367-2)

# SPDX-FileCopyrightText: 2020 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("1.3.6.1.4.1.25623.1.0.844451");
  script_cve_id("CVE-2019-19377", "CVE-2020-11565", "CVE-2020-12657");
  script_tag(name:"creation_date", value:"2020-05-29 03:00:39 +0000 (Fri, 29 May 2020)");
  script_version("2024-02-02T05:06:07+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:07 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"6.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:P");
  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:"2020-05-07 20:57:04 +0000 (Thu, 07 May 2020)");

  script_name("Ubuntu: Security Advisory (USN-4367-2)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 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=UBUNTU20\.04\ LTS");

  script_xref(name:"Advisory-ID", value:"USN-4367-2");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-4367-2");
  script_xref(name:"URL", value:"https://launchpad.net/bugs/1879690");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'linux' package(s) announced via the USN-4367-2 advisory.");

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

  script_tag(name:"insight", value:"USN-4367-1 fixed vulnerabilities in the 5.4 Linux kernel. Unfortunately,
that update introduced a regression in overlayfs. This update corrects
the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that the btrfs implementation in the Linux kernel did not
 properly detect that a block was marked dirty in some situations. An
 attacker could use this to specially craft a file system image that, when
 unmounted, could cause a denial of service (system crash). (CVE-2019-19377)

 It was discovered that the linux kernel did not properly validate certain
 mount options to the tmpfs virtual memory file system. A local attacker
 with the ability to specify mount options could use this to cause a denial
 of service (system crash). (CVE-2020-11565)

 It was discovered that the block layer in the Linux kernel contained a race
 condition leading to a use-after-free vulnerability. A local attacker could
 possibly use this to cause a denial of service (system crash) or execute
 arbitrary code. (CVE-2020-12657)");

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

  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 == "UBUNTU20.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-5.4.0-33-generic", ver:"5.4.0-33.37", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-5.4.0-33-generic-lpae", ver:"5.4.0-33.37", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-5.4.0-33-lowlatency", ver:"5.4.0-33.37", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-generic", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-generic-lpae", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-lowlatency", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-oem", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-oem-osp1", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"linux-image-virtual", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

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

exit(0);