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nessusThis script is Copyright (C) 2014-2018 Tenable Network Security, Inc.ALA_ALAS-2014-354.NASL
HistoryOct 12, 2014 - 12:00 a.m.

Amazon Linux AMI : pam (ALAS-2014-354)

2014-10-1200:00:00
This script is Copyright (C) 2014-2018 Tenable Network Security, Inc.
www.tenable.com
16

5.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.003 Low

EPSS

Percentile

71.7%

Multiple directory traversal vulnerabilities in pam_timestamp.c in the pam_timestamp module for Linux-PAM (aka pam) 1.1.8 allow local users to create aribitrary files or possibly bypass authentication via a โ€ฆ
(dot dot) in the (1) PAM_RUSER value to the get_ruser function or (2) PAM_TTY value to the check_tty funtion, which is used by the format_timestamp_name function.

The pam_userdb module for Pam uses a case-insensitive method to compare hashed passwords, which makes it easier for attackers to guess the password via a brute-force attack.

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2014-354.
#

include("compat.inc");

if (description)
{
  script_id(78297);
  script_version("1.3");
  script_cvs_date("Date: 2018/04/18 15:09:35");

  script_cve_id("CVE-2013-7041", "CVE-2014-2583");
  script_xref(name:"ALAS", value:"2014-354");

  script_name(english:"Amazon Linux AMI : pam (ALAS-2014-354)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Amazon Linux AMI host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Multiple directory traversal vulnerabilities in pam_timestamp.c in the
pam_timestamp module for Linux-PAM (aka pam) 1.1.8 allow local users
to create aribitrary files or possibly bypass authentication via a ..
(dot dot) in the (1) PAM_RUSER value to the get_ruser function or (2)
PAM_TTY value to the check_tty funtion, which is used by the
format_timestamp_name function.

The pam_userdb module for Pam uses a case-insensitive method to
compare hashed passwords, which makes it easier for attackers to guess
the password via a brute-force attack."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2014-354.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update pam' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:pam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:pam-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:pam-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2014/06/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/10/12");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2014-2018 Tenable Network Security, Inc.");
  script_family(english:"Amazon Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/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/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}

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


flag = 0;
if (rpm_check(release:"ALA", reference:"pam-1.1.8-9.29.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"pam-debuginfo-1.1.8-9.29.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"pam-devel-1.1.8-9.29.amzn1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "pam / pam-debuginfo / pam-devel");
}
VendorProductVersionCPE
amazonlinuxpamp-cpe:/a:amazon:linux:pam
amazonlinuxpam-debuginfop-cpe:/a:amazon:linux:pam-debuginfo
amazonlinuxpam-develp-cpe:/a:amazon:linux:pam-devel
amazonlinuxcpe:/o:amazon:linux

5.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.003 Low

EPSS

Percentile

71.7%