Debian DSA-1185-2 : openssl - 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-1185. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(22727);
  script_version("1.17");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2006-2937", "CVE-2006-2940", "CVE-2006-3738", "CVE-2006-4343");
  script_xref(name:"DSA", value:"1185");

  script_name(english:"Debian DSA-1185-2 : openssl - 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:
"The fix used to correct CVE-2006-2940 introduced code that could lead
to the use of uninitialized memory. Such use is likely to cause the
application using the openssl library to crash, and has the potential
to allow an attacker to cause the execution of arbitrary code. For
reference please find below the original advisory text :

  Multiple vulnerabilities have been discovered in the OpenSSL
  cryptographic software package that could allow an attacker to
  launch a denial of service attack by exhausting system resources or
  crashing processes on a victim's computer.

    - CVE-2006-2937
      Dr S N Henson of the OpenSSL core team and Open
      Network Security recently developed an ASN1 test suite
      for NISCC (www.niscc.gov.uk). When the test suite was
      run against OpenSSL two denial of service
      vulnerabilities were discovered.

    During the parsing of certain invalid ASN1 structures an error
    condition is mishandled. This can result in an infinite loop which
    consumes system memory.

    Any code which uses OpenSSL to parse ASN1 data from untrusted
    sources is affected. This includes SSL servers which enable client
    authentication and S/MIME applications.

    - CVE-2006-3738
      Tavis Ormandy and Will Drewry of the Google Security
      Team discovered a buffer overflow in
      SSL_get_shared_ciphers utility function, used by some
      applications such as exim and mysql. An attacker could
      send a list of ciphers that would overrun a buffer.

    - CVE-2006-4343
      Tavis Ormandy and Will Drewry of the Google Security
      Team discovered a possible DoS in the sslv2 client
      code. Where a client application uses OpenSSL to make
      a SSLv2 connection to a malicious server that server
      could cause the client to crash.

    - CVE-2006-2940
      Dr S N Henson of the OpenSSL core team and Open
      Network Security recently developed an ASN1 test suite
      for NISCC (www.niscc.gov.uk). When the test suite was
      run against OpenSSL a DoS was discovered.

    Certain types of public key can take disproportionate amounts of
    time to process. This could be used by an attacker in a denial of
    service attack."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2006-2937"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2006-3738"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2006-4343"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2006-2940"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.debian.org/security/2006/dsa-1185"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the openssl package. Note that services linking against the
openssl shared libraries will need to be restarted. Common examples of
such services include most Mail Transport Agents, SSH servers, and web
servers.

For the stable distribution (sarge) these problems have been fixed in
version 0.9.7e-3sarge4.

For the unstable and testing distributions (sid and etch,
respectively), these problems will be fixed in version 0.9.7k-3 of the
openssl097 compatibility libraries, and version 0.9.8c-3 of the
openssl package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_cwe_id(119, 399);

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

  script_set_attribute(attribute:"plugin_publication_date", value:"2006/10/14");
  script_set_attribute(attribute:"vuln_publication_date", value:"2006/09/28");
  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:"libssl-dev", reference:"0.9.7e-3sarge4")) flag++;
if (deb_check(release:"3.1", prefix:"libssl0.9.7", reference:"0.9.7e-3sarge4")) flag++;
if (deb_check(release:"3.1", prefix:"openssl", reference:"0.9.7e-3sarge4")) 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");