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RHEL 4 / 5 : ruby (RHSA-2008:0897)

2008-10-22T00:00:00
ID REDHAT-RHSA-2008-0897.NASL
Type nessus
Reporter This script is Copyright (C) 2008-2021 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2008-10-22T00:00:00

Description

Updated ruby packages that fix several security issues are now available for Red Hat Enterprise Linux 4 and 5.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

Ruby is an interpreted scripting language for quick and easy object-oriented programming.

The Ruby DNS resolver library, resolv.rb, used predictable transaction IDs and a fixed source port when sending DNS requests. A remote attacker could use this flaw to spoof a malicious reply to a DNS query. (CVE-2008-3905)

Ruby's XML document parsing module (REXML) was prone to a denial of service attack via XML documents with large XML entity definitions recursion. A specially crafted XML file could cause a Ruby application using the REXML module to use an excessive amount of CPU and memory. (CVE-2008-3790)

An insufficient 'taintness' check flaw was discovered in Ruby's DL module, which provides direct access to the C language functions. An attacker could use this flaw to bypass intended safe-level restrictions by calling external C functions with the arguments from an untrusted tainted inputs. (CVE-2008-3657)

A denial of service flaw was discovered in WEBrick, Ruby's HTTP server toolkit. A remote attacker could send a specially crafted HTTP request to a WEBrick server that would cause the server to use an excessive amount of CPU time. (CVE-2008-3656)

A number of flaws were found in the safe-level restrictions in Ruby. It was possible for an attacker to create a carefully crafted malicious script that can allow the bypass of certain safe-level restrictions. (CVE-2008-3655)

A denial of service flaw was found in Ruby's regular expression engine. If a Ruby script tried to process a large amount of data via a regular expression, it could cause Ruby to enter an infinite-loop and crash. (CVE-2008-3443)

Users of ruby should upgrade to these updated packages, which contain backported patches to resolve these issues.

                                        
                                            #%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2008:0897. The text 
# itself is copyright (C) Red Hat, Inc.
#

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

if (description)
{
  script_id(34466);
  script_version("1.29");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");

  script_cve_id("CVE-2008-1145", "CVE-2008-3443", "CVE-2008-3655", "CVE-2008-3656", "CVE-2008-3657", "CVE-2008-3790", "CVE-2008-3905", "CVE-2008-4310");
  script_bugtraq_id(30644, 30682, 31699);
  script_xref(name:"RHSA", value:"2008:0897");

  script_name(english:"RHEL 4 / 5 : ruby (RHSA-2008:0897)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated ruby packages that fix several security issues are now
available for Red Hat Enterprise Linux 4 and 5.

This update has been rated as having moderate security impact by the
Red Hat Security Response Team.

Ruby is an interpreted scripting language for quick and easy
object-oriented programming.

The Ruby DNS resolver library, resolv.rb, used predictable transaction
IDs and a fixed source port when sending DNS requests. A remote
attacker could use this flaw to spoof a malicious reply to a DNS
query. (CVE-2008-3905)

Ruby's XML document parsing module (REXML) was prone to a denial of
service attack via XML documents with large XML entity definitions
recursion. A specially crafted XML file could cause a Ruby application
using the REXML module to use an excessive amount of CPU and memory.
(CVE-2008-3790)

An insufficient 'taintness' check flaw was discovered in Ruby's DL
module, which provides direct access to the C language functions. An
attacker could use this flaw to bypass intended safe-level
restrictions by calling external C functions with the arguments from
an untrusted tainted inputs. (CVE-2008-3657)

A denial of service flaw was discovered in WEBrick, Ruby's HTTP server
toolkit. A remote attacker could send a specially crafted HTTP request
to a WEBrick server that would cause the server to use an excessive
amount of CPU time. (CVE-2008-3656)

A number of flaws were found in the safe-level restrictions in Ruby.
It was possible for an attacker to create a carefully crafted
malicious script that can allow the bypass of certain safe-level
restrictions. (CVE-2008-3655)

A denial of service flaw was found in Ruby's regular expression
engine. If a Ruby script tried to process a large amount of data via a
regular expression, it could cause Ruby to enter an infinite-loop and
crash. (CVE-2008-3443)

Users of ruby should upgrade to these updated packages, which contain
backported patches to resolve these issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2008-1145"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2008-3443"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2008-3655"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2008-3656"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2008-3657"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2008-3790"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2008-3905"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2008:0897"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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(20, 22, 264, 287, 399);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:irb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-irb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-mode");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-rdoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-ri");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-tcltk");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:4.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:5.2");

  script_set_attribute(attribute:"vuln_publication_date", value:"2008/03/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2008/10/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2008/10/22");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2008-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

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

  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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^(4|5)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 4.x / 5.x", "Red Hat " + 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 ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2008:0897";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL4", reference:"irb-1.8.1-7.el4_7.1")) flag++;

  if (rpm_check(release:"RHEL4", reference:"ruby-1.8.1-7.el4_7.1")) flag++;

  if (rpm_check(release:"RHEL4", reference:"ruby-devel-1.8.1-7.el4_7.1")) flag++;

  if (rpm_check(release:"RHEL4", reference:"ruby-docs-1.8.1-7.el4_7.1")) flag++;

  if (rpm_check(release:"RHEL4", reference:"ruby-libs-1.8.1-7.el4_7.1")) flag++;

  if (rpm_check(release:"RHEL4", reference:"ruby-mode-1.8.1-7.el4_7.1")) flag++;

  if (rpm_check(release:"RHEL4", reference:"ruby-tcltk-1.8.1-7.el4_7.1")) flag++;


  if (rpm_check(release:"RHEL5", cpu:"i386", reference:"ruby-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"s390x", reference:"ruby-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"x86_64", reference:"ruby-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", reference:"ruby-devel-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"i386", reference:"ruby-docs-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"s390x", reference:"ruby-docs-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"x86_64", reference:"ruby-docs-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"i386", reference:"ruby-irb-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"s390x", reference:"ruby-irb-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"x86_64", reference:"ruby-irb-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", reference:"ruby-libs-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"i386", reference:"ruby-mode-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"s390x", reference:"ruby-mode-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"x86_64", reference:"ruby-mode-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"i386", reference:"ruby-rdoc-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"s390x", reference:"ruby-rdoc-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"x86_64", reference:"ruby-rdoc-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"i386", reference:"ruby-ri-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"s390x", reference:"ruby-ri-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"x86_64", reference:"ruby-ri-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"i386", reference:"ruby-tcltk-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"s390x", reference:"ruby-tcltk-1.8.5-5.el5_2.5")) flag++;

  if (rpm_check(release:"RHEL5", cpu:"x86_64", reference:"ruby-tcltk-1.8.5-5.el5_2.5")) flag++;


  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "irb / ruby / ruby-devel / ruby-docs / ruby-irb / ruby-libs / etc");
  }
}
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