Debian DLA-2441-1 : sympa security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2441-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(142670);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/11/20");

  script_cve_id("CVE-2018-1000671", "CVE-2020-26880");

  script_name(english:"Debian DLA-2441-1 : sympa security update");
  script_summary(english:"Checks dpkg output for the updated package.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"A privilege escalation was discovered in Sympa, a modern mailing list
manager. It is fixed when Sympa is used in conjunction with common
MTAs (such as Exim or Postfix) by disabling a setuid executable,
although no fix is currently available for all environments (such as
sendmail). Additionally, an open-redirect vulnerability was discovered
and fixed.

CVE-2020-26880

Sympa allows a local privilege escalation from the sympa user account
to full root access by modifying the sympa.conf configuration file
(which is owned by sympa) and parsing it through the setuid
sympa_newaliases-wrapper executable.

CVE-2018-1000671

Sympa contains a CWE-601: URL Redirection to Untrusted Site ('Open
Redirect') vulnerability in The 'referer' parameter of the
wwsympa.fcgi login action. that can result in Open redirection and
reflected XSS via data URIs.

For Debian 9 stretch, these problems have been fixed in version
6.2.16~dfsg-3+deb9u4.

We recommend that you upgrade your sympa packages.

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

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/2020/11/msg00015.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/sympa"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/sympa"
  );
  script_set_attribute(
    attribute:"solution",
    value:"Upgrade the affected sympa package."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/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-2020-26880");
  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:debian:debian_linux:sympa");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/09/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/11/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/11/10");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  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:"sympa", reference:"6.2.16~dfsg-3+deb9u4")) flag++;

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