SUSE SLES12 Security Update : bash (SUSE-SU-2018:1398-2)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2018:1398-2.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(118257);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/07");

  script_cve_id("CVE-2016-0634", "CVE-2016-7543");

  script_name(english:"SUSE SLES12 Security Update : bash (SUSE-SU-2018:1398-2)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"This update for bash fixes the following issues :

Security issues fixed :

CVE-2016-7543: A code execution possibility via SHELLOPTS+PS4 variable
was fixed (bsc#1001299)

CVE-2016-0634: Arbitrary code execution via malicious hostname was
fixed (bsc#1000396)

Non-security issues fixed: Fix repeating self-calling of traps due the
combination of a non-interactive shell, a trap handler for SIGINT, an
external process in the trap handler, and a SIGINT within the trap
after the external process runs. (bsc#1086247)

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1000396"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1001299"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1086247"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-0634/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-7543/"
  );
  # https://www.suse.com/support/update/announcement/2018/suse-su-20181398-2/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?f6ebc8c4"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"To install this SUSE Security Update use the SUSE recommended
installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server 12-SP2-BCL:zypper in -t patch
SUSE-SLE-SERVER-12-SP2-BCL-2018-977=1"
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-7543");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bash");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bash-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bash-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libreadline6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libreadline6-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/01/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/22");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

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

  exit(0);
}


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


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLES12", "SUSE " + os_ver);

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);
if (cpu >!< "x86_64") audit(AUDIT_ARCH_NOT, "x86_64", cpu);


sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(2)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP2", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"bash-4.3-83.10.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"bash-debuginfo-4.3-83.10.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"bash-debugsource-4.3-83.10.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"libreadline6-32bit-6.3-83.10.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"libreadline6-6.3-83.10.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"libreadline6-debuginfo-32bit-6.3-83.10.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"libreadline6-debuginfo-6.3-83.10.1")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "bash");
}