Ubuntu: Security Advisory (USN-5936-1)

# SPDX-FileCopyrightText: 2023 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("1.3.6.1.4.1.25623.1.1.12.2023.5936.1");
  script_cve_id("CVE-2022-3437", "CVE-2022-37966", "CVE-2022-37967", "CVE-2022-38023", "CVE-2022-42898", "CVE-2022-45141");
  script_tag(name:"creation_date", value:"2023-03-09 04:11:27 +0000 (Thu, 09 Mar 2023)");
  script_version("2024-02-02T05:06:10+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:10 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-03-13 18:05:10 +0000 (Mon, 13 Mar 2023)");

  script_name("Ubuntu: Security Advisory (USN-5936-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2023 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-5936-1");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-5936-1");
  script_xref(name:"URL", value:"https://www.samba.org/samba/history/samba-4.15.0.html");
  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2022-37966.html");
  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2022-37967.html");
  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2022-38023.html");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'samba' package(s) announced via the USN-5936-1 advisory.");

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

  script_tag(name:"insight", value:"Evgeny Legerov discovered that Samba incorrectly handled buffers in
certain GSSAPI routines of Heimdal. A remote attacker could possibly use
this issue to cause Samba to crash, resulting in a denial of service.
(CVE-2022-3437)

Tom Tervoort discovered that Samba incorrectly used weak rc4-hmac Kerberos
keys. A remote attacker could possibly use this issue to elevate
privileges. (CVE-2022-37966, CVE-2022-37967)

It was discovered that Samba supported weak RC4/HMAC-MD5 in NetLogon Secure
Channel. A remote attacker could possibly use this issue to elevate
privileges. (CVE-2022-38023)

Greg Hudson discovered that Samba incorrectly handled PAC parsing. On
32-bit systems, a remote attacker could use this issue to escalate
privileges, or possibly execute arbitrary code. (CVE-2022-42898)

Joseph Sutton discovered that Samba could be forced to issue rc4-hmac
encrypted Kerberos tickets. A remote attacker could possibly use this issue
to escalate privileges. This issue only affected Ubuntu 20.04 LTS and
Ubuntu 22.04 LTS. (CVE-2022-45141)

WARNING: This update upgrades the version of Samba to 4.15.13. Please see
the upstream release notes for important changes in the new version:

[link moved to references]

In addition, the security fixes included in this new version introduce
several important behavior changes which may cause compatibility problems
interacting with systems still expecting the former behavior. Please see
the following upstream advisories for more information:

[link moved to references]
[link moved to references]
[link moved to references]");

  script_tag(name:"affected", value:"'samba' 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:"samba", ver:"2:4.15.13+dfsg-0ubuntu0.20.04.1", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

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

exit(0);