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nessusThis script is Copyright (C) 2013-2021 and is owned by Tenable, Inc. or an Affiliate thereof.CENTOS_RHSA-2013-0521.NASL
HistoryMar 10, 2013 - 12:00 a.m.

CentOS 6 : pam (CESA-2013:0521)

2013-03-1000:00:00
This script is Copyright (C) 2013-2021 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
24
centos 6
pam packages
security issues
buffer overflow
denial of service
enhancements
cve-2011-3148
cve-2011-3149

CVSS2

4.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS

0

Percentile

5.1%

Updated pam packages that fix two security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Pluggable Authentication Modules (PAM) provide a system whereby administrators can set up authentication policies without having to recompile programs to handle authentication.

A stack-based buffer overflow flaw was found in the way the pam_env module parsed users’ ‘~/.pam_environment’ files. If an application’s PAM configuration contained ‘user_readenv=1’ (this is not the default), a local attacker could use this flaw to crash the application or, possibly, escalate their privileges. (CVE-2011-3148)

A denial of service flaw was found in the way the pam_env module expanded certain environment variables. If an application’s PAM configuration contained ‘user_readenv=1’ (this is not the default), a local attacker could use this flaw to cause the application to enter an infinite loop. (CVE-2011-3149)

Red Hat would like to thank Kees Cook of the Google ChromeOS Team for reporting the CVE-2011-3148 and CVE-2011-3149 issues.

These updated pam packages include numerous bug fixes and enhancements. Space precludes documenting all of these changes in this advisory. Users are directed to the Red Hat Enterprise Linux 6.4 Technical Notes, linked to in the References, for information on the most significant of these changes.

All pam users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.

#%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-2013:0521 and 
# CentOS Errata and Security Advisory 2013:0521 respectively.
#

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

if (description)
{
  script_id(65152);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2011-3148", "CVE-2011-3149");
  script_bugtraq_id(50343);
  script_xref(name:"RHSA", value:"2013:0521");

  script_name(english:"CentOS 6 : pam (CESA-2013:0521)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated pam packages that fix two security issues, several bugs, and
add various enhancements are now available for Red Hat Enterprise
Linux 6.

The Red Hat Security Response Team has rated this update as having
moderate security impact. Common Vulnerability Scoring System (CVSS)
base scores, which give detailed severity ratings, are available for
each vulnerability from the CVE links in the References section.

Pluggable Authentication Modules (PAM) provide a system whereby
administrators can set up authentication policies without having to
recompile programs to handle authentication.

A stack-based buffer overflow flaw was found in the way the pam_env
module parsed users' '~/.pam_environment' files. If an application's
PAM configuration contained 'user_readenv=1' (this is not the
default), a local attacker could use this flaw to crash the
application or, possibly, escalate their privileges. (CVE-2011-3148)

A denial of service flaw was found in the way the pam_env module
expanded certain environment variables. If an application's PAM
configuration contained 'user_readenv=1' (this is not the default), a
local attacker could use this flaw to cause the application to enter
an infinite loop. (CVE-2011-3149)

Red Hat would like to thank Kees Cook of the Google ChromeOS Team for
reporting the CVE-2011-3148 and CVE-2011-3149 issues.

These updated pam packages include numerous bug fixes and
enhancements. Space precludes documenting all of these changes in this
advisory. Users are directed to the Red Hat Enterprise Linux 6.4
Technical Notes, linked to in the References, for information on the
most significant of these changes.

All pam users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add these
enhancements."
  );
  # https://lists.centos.org/pipermail/centos-announce/2013-March/019462.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?a66dcc2d"
  );
  # https://lists.centos.org/pipermail/centos-cr-announce/2013-February/000653.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?c91523f5"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected pam packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2011-3148");
  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:centos:centos:pam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pam-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2012/07/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/03/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/03/10");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2013-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-6", reference:"pam-1.1.1-13.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"pam-devel-1.1.1-13.el6")) flag++;


if (flag)
{
  cr_plugin_caveat = '\n' +
    'NOTE: The security advisory associated with this vulnerability has a\n' +
    'fixed package version that may only be available in the continuous\n' +
    'release (CR) repository for CentOS, until it is present in the next\n' +
    'point release of CentOS.\n\n' +

    'If an equal or higher package level does not exist in the baseline\n' +
    'repository for your major version of CentOS, then updates from the CR\n' +
    'repository will need to be applied in order to address the\n' +
    'vulnerability.\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get() + cr_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "pam / pam-devel");
}

CVSS2

4.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS

0

Percentile

5.1%