Debian DLA-2328-1 : dovecot security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2328-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(139626);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/26");

  script_cve_id("CVE-2020-12100", "CVE-2020-12673", "CVE-2020-12674");

  script_name(english:"Debian DLA-2328-1 : dovecot security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security 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.

For Debian 9 stretch, these problems have been fixed in version
1:2.2.27-3+deb9u6.

We recommend that you upgrade your dovecot packages.

For the detailed security status of dovecot please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/dovecot

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues.");
  script_set_attribute(attribute:"see_also", value:"https://lists.debian.org/debian-lts-announce/2020/08/msg00024.html");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/stretch/dovecot");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/dovecot");
  script_set_attribute(attribute:"solution", value:
"Upgrade the affected packages.");
  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:"2020/08/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/08/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-gssapi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-imapd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-lmtpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-lucene");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-managesieved");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-pgsql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-pop3d");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-sieve");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-solr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-sqlite");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
  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:"9.0", prefix:"dovecot-core", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-dbg", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-dev", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-gssapi", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-imapd", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-ldap", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-lmtpd", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-lucene", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-managesieved", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-mysql", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-pgsql", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-pop3d", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-sieve", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-solr", reference:"1:2.2.27-3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-sqlite", reference:"1:2.2.27-3+deb9u6")) 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");