Scientific Linux Security Update : libssh2 on SL7.x x86_64 (20151119)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#

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

if (description)
{
  script_id(87561);
  script_version("2.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");

  script_cve_id("CVE-2015-1782");

  script_name(english:"Scientific Linux Security Update : libssh2 on SL7.x x86_64 (20151119)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Scientific Linux host is missing one or more security
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"A flaw was found in the way the kex_agree_methods() function of
libssh2 performed a key exchange when negotiating a new SSH session. A
man-in-the- middle attacker could use a crafted SSH_MSG_KEXINIT packet
to crash a connecting libssh2 client. (CVE-2015-1782)

This update also fixes the following bugs :

  - Previously, libssh2 did not correctly adjust the size of
    the receive window while reading from an SSH channel.
    This caused downloads over the secure copy (SCP)
    protocol to consume an excessive amount of memory. A
    series of upstream patches has been applied on the
    libssh2 source code to improve handling of the receive
    window size. Now, SCP downloads work as expected.

  - Prior to this update, libssh2 did not properly
    initialize an internal variable holding the SSH agent
    file descriptor, which caused the agent destructor to
    close the standard input file descriptor by mistake. An
    upstream patch has been applied on libssh2 sources to
    properly initialize the internal variable. Now, libssh2
    closes only the file descriptors it owns.

After installing these updated packages, all running applications
using libssh2 must be restarted for this update to take effect."
  );
  # https://listserv.fnal.gov/scripts/wa.exe?A2=ind1512&L=scientific-linux-errata&F=&S=&P=15335
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?243f8b04"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libssh2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libssh2-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libssh2-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libssh2-docs");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/03/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/11/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/22");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Scientific Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 7.x", "Scientific Linux " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);


flag = 0;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libssh2-1.4.3-10.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libssh2-debuginfo-1.4.3-10.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libssh2-devel-1.4.3-10.el7")) flag++;
if (rpm_check(release:"SL7", reference:"libssh2-docs-1.4.3-10.el7")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libssh2 / libssh2-debuginfo / libssh2-devel / libssh2-docs");
}