Debian DLA-364-1 : gnutls26 security update

2015-12-10T00:00:00
ID DEBIAN_DLA-364.NASL
Type nessus
Reporter Tenable
Modified 2018-07-09T00:00:00

Description

Hanno Böck discovered that GnuTLS, a library implementing the TLS and SSL protocols, incorrectly validated the first padding byte in CBC modes. A remote attacker can possibly take advantage of this flaw to perform a padding oracle attack.

For Debian 6 'Squeeze', this issue has been fixed in gnutls26 version 2.8.6-1+squeeze6. We recommend you to upgrade your gnutls26 packages.

Learn more about the Debian Long Term Support (LTS) Project and how to apply these updates at: https://wiki.debian.org/LTS/

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-364-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(87286);
  script_version("1.4");
  script_cvs_date("Date: 2018/07/09 12:26:57");

  script_cve_id("CVE-2015-8313");

  script_name(english:"Debian DLA-364-1 : gnutls26 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:
"Hanno Böck discovered that GnuTLS, a library implementing the TLS
and SSL protocols, incorrectly validated the first padding byte in CBC
modes. A remote attacker can possibly take advantage of this flaw to
perform a padding oracle attack.

For Debian 6 'Squeeze', this issue has been fixed in gnutls26 version
2.8.6-1+squeeze6. We recommend you to upgrade your gnutls26 packages.

Learn more about the Debian Long Term Support (LTS) Project and how to
apply these updates at: https://wiki.debian.org/LTS/

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/2015/12/msg00005.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/squeeze-lts/gnutls26"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://wiki.debian.org/LTS/"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_attribute(attribute:"risk_factor", value:"High");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gnutls-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gnutls-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:guile-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls26");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls26-dbg");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/12/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/10");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2018 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:"6.0", prefix:"gnutls-bin", reference:"2.8.6-1+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"gnutls-doc", reference:"2.8.6-1+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"guile-gnutls", reference:"2.8.6-1+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"libgnutls-dev", reference:"2.8.6-1+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"libgnutls26", reference:"2.8.6-1+squeeze6")) flag++;
if (deb_check(release:"6.0", prefix:"libgnutls26-dbg", reference:"2.8.6-1+squeeze6")) 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");