CentOS 7 : dovecot (CESA-2019:2836)

2019-09-27T00:00:00
ID CENTOS_RHSA-2019-2836.NASL
Type nessus
Reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-12-02T00:00:00

Description

An update for dovecot is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.

Security Fix(es) :

  • dovecot: improper NULL byte handling in IMAP and ManageSieve protocol parsers leads to out of bounds writes (CVE-2019-11500)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:2836 and 
# CentOS Errata and Security Advisory 2019:2836 respectively.
#

include("compat.inc");

if (description)
{
  script_id(129393);
  script_version("1.4");
  script_cvs_date("Date: 2019/12/31");

  script_cve_id("CVE-2019-11500");
  script_xref(name:"RHSA", value:"2019:2836");

  script_name(english:"CentOS 7 : dovecot (CESA-2019:2836)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for dovecot is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

Dovecot is an IMAP server for Linux and other UNIX-like systems,
written primarily with security in mind. It also contains a small POP3
server, and supports e-mail in either the maildir or mbox format. The
SQL drivers and authentication plug-ins are provided as subpackages.

Security Fix(es) :

* dovecot: improper NULL byte handling in IMAP and ManageSieve
protocol parsers leads to out of bounds writes (CVE-2019-11500)

For more details about the security issue(s), including the impact, a
CVSS score, acknowledgments, and other related information, refer to
the CVE page(s) listed in the References section."
  );
  # https://lists.centos.org/pipermail/centos-announce/2019-September/023451.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?ed806bed"
  );
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-11500");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dovecot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dovecot-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dovecot-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dovecot-pgsql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dovecot-pigeonhole");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/08/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/09/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/09/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"dovecot-2.2.36-3.el7_7.1")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"dovecot-devel-2.2.36-3.el7_7.1")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"dovecot-mysql-2.2.36-3.el7_7.1")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"dovecot-pgsql-2.2.36-3.el7_7.1")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"dovecot-pigeonhole-2.2.36-3.el7_7.1")) 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 / dovecot-devel / dovecot-mysql / dovecot-pgsql / etc");
}