Debian DSA-1212-1 : openssh - Denial of service

#%NASL_MIN_LEVEL 70300

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-1212. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(23661);
  script_version("1.19");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2006-4924", "CVE-2006-5051");
  script_bugtraq_id(20216, 20241);
  script_xref(name:"DSA", value:"1212");

  script_name(english:"Debian DSA-1212-1 : openssh - Denial of service");
  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:
"Two denial of service problems have been found in the OpenSSH server.
The Common Vulnerabilities and Exposures project identifies the
following vulnerabilities :

  - CVE-2006-4924
    The sshd support for ssh protocol version 1 does not
    properly handle duplicate incoming blocks. This could
    allow a remote attacker to cause sshd to consume
    significant CPU resources leading to a denial of
    service.

  - CVE-2006-5051
    A signal handler race condition could potentially allow
    a remote attacker to crash sshd and could theoretically
    lead to the ability to execute arbitrary code."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=392428"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2006-4924"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2006-5051"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.debian.org/security/2006/dsa-1212"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the openssh package.

For the stable distribution (sarge), these problems have been fixed in
version 1:3.8.1p1-8.sarge.6.

For the unstable and testing distributions, these problems have been
fixed in version 1:4.3p2-4."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(362, 399);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openssh");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:3.1");

  script_set_attribute(attribute:"patch_publication_date", value:"2006/11/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2006/11/20");
  script_set_attribute(attribute:"vuln_publication_date", value:"2006/09/25");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2006-2021 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:"3.1", prefix:"ssh", reference:"1:3.8.1p1-8.sarge.6")) flag++;
if (deb_check(release:"3.1", prefix:"ssh-askpass-gnome", reference:"1:3.8.1p1-8.sarge.6")) 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");