Debian DLA-2028-1 : squid3 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-2028-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(131961);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2019-12526", "CVE-2019-18677", "CVE-2019-18678", "CVE-2019-18679");

  script_name(english:"Debian DLA-2028-1 : squid3 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:
"It was found that Squid, a high-performance proxy caching server for
web clients, has been affected by the following security
vulnerabilities.

CVE-2019-12526

URN response handling in Squid suffers from a heap-based buffer
overflow. When receiving data from a remote server in response to an
URN request, Squid fails to ensure that the response can fit within
the buffer. This leads to attacker controlled data overflowing in the
heap.

CVE-2019-18677

When the append_domain setting is used (because the appended
characters do not properly interact with hostname length
restrictions), it can inappropriately redirect traffic to origins it
should not be delivered to. This happens because of incorrect message
processing.

CVE-2019-18678

A programming error allows attackers to smuggle HTTP requests through
frontend software to a Squid instance that splits the HTTP Request
pipeline differently. The resulting Response messages corrupt caches
(between a client and Squid) with attacker-controlled content at
arbitrary URLs. Effects are isolated to software between the attacker
client and Squid. There are no effects on Squid itself, nor on any
upstream servers. The issue is related to a request header containing
whitespace between a header name and a colon.

CVE-2019-18679

Due to incorrect data management, Squid is vulnerable to information
disclosure when processing HTTP Digest Authentication. Nonce tokens
contain the raw byte value of a pointer that sits within heap memory
allocation. This information reduces ASLR protections and may aid
attackers isolating memory areas to target for remote code execution
attacks.

For Debian 8 'Jessie', these problems have been fixed in version
3.4.8-6+deb8u9.

We recommend that you upgrade your squid3 packages.

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/2019/12/msg00011.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/squid3"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected 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-2019-12526");
  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:squid-cgi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid-purge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid3-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid3-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squidclient");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/12");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2021 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:"8.0", prefix:"squid-cgi", reference:"3.4.8-6+deb8u9")) flag++;
if (deb_check(release:"8.0", prefix:"squid-purge", reference:"3.4.8-6+deb8u9")) flag++;
if (deb_check(release:"8.0", prefix:"squid3", reference:"3.4.8-6+deb8u9")) flag++;
if (deb_check(release:"8.0", prefix:"squid3-common", reference:"3.4.8-6+deb8u9")) flag++;
if (deb_check(release:"8.0", prefix:"squid3-dbg", reference:"3.4.8-6+deb8u9")) flag++;
if (deb_check(release:"8.0", prefix:"squidclient", reference:"3.4.8-6+deb8u9")) 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");