Debian DLA-2670-1 : nginx security update

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2670-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(150097);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/09/21");

  script_cve_id("CVE-2021-23017");

  script_name(english:"Debian DLA-2670-1 : nginx security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Luis Merino, Markus Vervier and Eric Sesterhenn discovered an
off-by-one in Nginx, a high-performance web and reverse proxy server,
which could result in denial of service and potentially the execution
of arbitrary code.

For Debian 9 stretch, this problem has been fixed in version
1.10.3-1+deb9u6.

We recommend that you upgrade your nginx packages.

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

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/2021/05/msg00025.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/nginx"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/nginx"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:H/PR:N/UI:N/S:U/C:H/I:H/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-23017");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-auth-pam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-cache-purge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-dav-ext");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-echo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-fancyindex");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-geoip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-headers-more-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-image-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-lua");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-ndk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-subs-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-uploadprogress");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-upstream-fair");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-xslt-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-mail");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-nchan");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-stream");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-extras");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-full");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-light");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/06/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/01");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2021-2022 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:"libnginx-mod-http-auth-pam", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-cache-purge", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-dav-ext", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-echo", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-fancyindex", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-geoip", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-headers-more-filter", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-image-filter", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-lua", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-ndk", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-perl", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-subs-filter", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-uploadprogress", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-upstream-fair", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-http-xslt-filter", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-mail", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-nchan", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libnginx-mod-stream", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"nginx", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"nginx-common", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"nginx-doc", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"nginx-extras", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"nginx-full", reference:"1.10.3-1+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"nginx-light", reference:"1.10.3-1+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");