Scientific Linux Security Update : sudo on SL7.x x86_64

2016-12-15T00:00:00
ID SL_20161103_SUDO_ON_SL7_X.NASL
Type nessus
Reporter Tenable
Modified 2018-12-28T00:00:00

Description

Security Fix(es) :

  • It was discovered that the default sudo configuration preserved the value of INPUTRC from the user's environment, which could lead to information disclosure. A local user with sudo access to a restricted program that uses readline could use this flaw to read content from specially formatted files with elevated privileges provided by sudo. (CVE-2016-7091)

Note: With this update, INPUTRC was removed from the env_keep list in /etc/sudoers to avoid having sudo preserve the value of this variable when invoking privileged commands.

Additional Changes :

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

include("compat.inc");

if (description)
{
  script_id(95861);
  script_version("3.3");
  script_cvs_date("Date: 2018/12/28 10:10:36");

  script_cve_id("CVE-2016-7091");

  script_name(english:"Scientific Linux Security Update : sudo on SL7.x x86_64");
  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:
"Security Fix(es) :

  - It was discovered that the default sudo configuration
    preserved the value of INPUTRC from the user's
    environment, which could lead to information disclosure.
    A local user with sudo access to a restricted program
    that uses readline could use this flaw to read content
    from specially formatted files with elevated privileges
    provided by sudo. (CVE-2016-7091)

Note: With this update, INPUTRC was removed from the env_keep list in
/etc/sudoers to avoid having sudo preserve the value of this variable
when invoking privileged commands.

Additional Changes :"
  );
  # https://listserv.fnal.gov/scripts/wa.exe?A2=ind1612&L=scientific-linux-errata&F=&S=&P=4962
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?d0c2edee"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected sudo, sudo-debuginfo and / or sudo-devel packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/11/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/12/15");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2018 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("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");
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:"sudo-1.8.6p7-20.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"sudo-debuginfo-1.8.6p7-20.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"sudo-devel-1.8.6p7-20.el7")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");