EulerOS 2.0 SP2 : dovecot (EulerOS-SA-2019-2372)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(131864);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/04");

  script_cve_id("CVE-2017-14461", "CVE-2017-15130", "CVE-2019-11500");

  script_name(english:"EulerOS 2.0 SP2 : dovecot (EulerOS-SA-2019-2372)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the dovecot packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

  - A denial of service flaw was found in dovecot before
    2.2.34. An attacker able to generate random SNI server
    names could exploit TLS SNI configuration lookups,
    leading to excessive memory usage and the process to
    restart.(CVE-2017-15130)

  - A specially crafted email delivered over SMTP and
    passed on to Dovecot by MTA can trigger an out of
    bounds read resulting in potential sensitive
    information disclosure and denial of service. In order
    to trigger this vulnerability, an attacker needs to
    send a specially crafted email message to the
    server.(CVE-2017-14461)

  - In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2
    (and Pigeonhole before 0.5.7.2), protocol processing
    can fail for quoted strings. This occurs because '\0'
    characters are mishandled, and can lead to
    out-of-bounds writes and remote code
    execution.(CVE-2019-11500)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2019-2372
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d93b9871");
  script_set_attribute(attribute:"solution", value:
"Update the affected dovecot packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-11500");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dovecot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dovecot-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dovecot-pgsql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dovecot-pigeonhole");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(2)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP2");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP2", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

flag = 0;

pkgs = ["dovecot-2.2.10-5.h6",
        "dovecot-mysql-2.2.10-5.h6",
        "dovecot-pgsql-2.2.10-5.h6",
        "dovecot-pigeonhole-2.2.10-5.h6"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"2", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "dovecot");
}