Debian DSA-3901-1 : libgcrypt20 - security update

2017-07-03T00:00:00
ID DEBIAN_DSA-3901.NASL
Type nessus
Reporter Tenable
Modified 2017-08-14T00:00:00

Description

Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal and Yuval Yarom discovered that Libgcrypt is prone to a local side-channel attack allowing full key recovery for RSA-1024.

See https://eprint.iacr.org/2017/627 for details.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-3901. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(101176);
  script_version("$Revision: 3.3 $");
  script_cvs_date("$Date: 2017/08/14 14:13:51 $");

  script_cve_id("CVE-2017-7526");
  script_osvdb_id(160187);
  script_xref(name:"DSA", value:"3901");

  script_name(english:"Debian DSA-3901-1 : libgcrypt20 - 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-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot
Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal and
Yuval Yarom discovered that Libgcrypt is prone to a local side-channel
attack allowing full key recovery for RSA-1024.

See https://eprint.iacr.org/2017/627 for details."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://eprint.iacr.org/2017/627"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/libgcrypt20"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/libgcrypt20"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.debian.org/security/2017/dsa-3901"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the libgcrypt20 packages.

For the oldstable distribution (jessie), this problem has been fixed
in version 1.6.3-2+deb8u4.

For the stable distribution (stretch), this problem has been fixed in
version 1.7.6-2+deb9u1."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:ND");
  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:libgcrypt20");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/07/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/03");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017 Tenable Network Security, Inc.");
  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:"libgcrypt11-dev", reference:"1.6.3-2+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"libgcrypt20", reference:"1.6.3-2+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"libgcrypt20-dbg", reference:"1.6.3-2+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"libgcrypt20-dev", reference:"1.6.3-2+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"libgcrypt20-doc", reference:"1.6.3-2+deb8u4")) flag++;
if (deb_check(release:"9.0", prefix:"libgcrypt-mingw-w64-dev", reference:"1.7.6-2+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libgcrypt11-dev", reference:"1.7.6-2+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libgcrypt20", reference:"1.7.6-2+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libgcrypt20-dev", reference:"1.7.6-2+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libgcrypt20-doc", reference:"1.7.6-2+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libgcrypt20-udeb", reference:"1.7.6-2+deb9u1")) flag++;

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