Debian DSA-4745-1 : dovecot - security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4745. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(139553);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/26");

  script_cve_id("CVE-2020-12100", "CVE-2020-12673", "CVE-2020-12674");
  script_xref(name:"DSA", value:"4745");

  script_name(english:"Debian DSA-4745-1 : dovecot - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"Several vulnerabilities have been discovered in the Dovecot email
server.

  - CVE-2020-12100
    Receiving mail with deeply nested MIME parts leads to
    resource exhaustion as Dovecot attempts to parse it.

  - CVE-2020-12673
    Dovecot's NTLM implementation does not correctly check
    message buffer size, which leads to a crash when reading
    past allocation.

  - CVE-2020-12674
    Dovecot's RPA mechanism implementation accepts
    zero-length message, which leads to assert-crash later
    on.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-12100");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-12673");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-12674");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/dovecot");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/dovecot");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2020/dsa-4745");
  script_set_attribute(attribute:"solution", value:
"Upgrade the dovecot packages.

For the stable distribution (buster), these problems have been fixed
in version 1:2.3.4.1-5+deb10u3.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/I:N/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-2020-12674");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/08/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/08/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/08/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"10.0", prefix:"dovecot-auth-lua", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-core", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-dev", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-gssapi", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-imapd", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-ldap", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-lmtpd", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-lucene", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-managesieved", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-mysql", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-pgsql", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-pop3d", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-sieve", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-solr", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-sqlite", reference:"1:2.3.4.1-5+deb10u3")) flag++;
if (deb_check(release:"10.0", prefix:"dovecot-submissiond", reference:"1:2.3.4.1-5+deb10u3")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");