An updated pam package that fixes one security issue is now available for Red Hat Enterprise Linux 6 and 7.
Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link 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.
It was discovered that the _unix_run_helper_binary() function of PAM’s unix_pam module could write to a blocking pipe, possibly causing the function to become unresponsive. An attacker able to supply large passwords to the unix_pam module could use this flaw to enumerate valid user accounts, or cause a denial of service on the system.
(CVE-2015-3238)
Red Hat would like to thank Sebastien Macke of Trustwave SpiderLabs for reporting this issue.
All pam users are advised to upgrade to this updated package, which contains a backported patch to correct this issue.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2015:1640. The text
# itself is copyright (C) Red Hat, Inc.
#
include("compat.inc");
if (description)
{
script_id(85530);
script_version("2.16");
script_cvs_date("Date: 2019/10/24 15:35:40");
script_cve_id("CVE-2015-3238");
script_xref(name:"RHSA", value:"2015:1640");
script_name(english:"RHEL 6 / 7 : pam (RHSA-2015:1640)");
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:
"An updated pam package that fixes one security issue is now available
for Red Hat Enterprise Linux 6 and 7.
Red Hat Product Security has rated this update as having Moderate
security impact. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available from the
CVE link 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.
It was discovered that the _unix_run_helper_binary() function of PAM's
unix_pam module could write to a blocking pipe, possibly causing the
function to become unresponsive. An attacker able to supply large
passwords to the unix_pam module could use this flaw to enumerate
valid user accounts, or cause a denial of service on the system.
(CVE-2015-3238)
Red Hat would like to thank Sebastien Macke of Trustwave SpiderLabs
for reporting this issue.
All pam users are advised to upgrade to this updated package, which
contains a backported patch to correct this issue."
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/errata/RHSA-2015:1640"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2015-3238"
);
script_set_attribute(
attribute:"solution",
value:"Update the affected pam, pam-debuginfo and / or pam-devel packages."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
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:redhat:enterprise_linux:pam");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pam-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pam-devel");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6.7");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.1");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.2");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.3");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.4");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.5");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.6");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.7");
script_set_attribute(attribute:"vuln_publication_date", value:"2015/08/24");
script_set_attribute(attribute:"patch_publication_date", value:"2015/08/18");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/08/19");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2015-2019 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:"^(6|7)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 6.x / 7.x", "Red Hat " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "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-2015:1640";
yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
if (!empty_or_null(yum_report))
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
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:"RHEL6", reference:"pam-1.1.1-20.el6_7.1")) flag++;
if (rpm_check(release:"RHEL6", reference:"pam-debuginfo-1.1.1-20.el6_7.1")) flag++;
if (rpm_check(release:"RHEL6", reference:"pam-devel-1.1.1-20.el6_7.1")) flag++;
if (rpm_check(release:"RHEL7", reference:"pam-1.1.8-12.el7_1.1")) flag++;
if (rpm_check(release:"RHEL7", reference:"pam-debuginfo-1.1.8-12.el7_1.1")) flag++;
if (rpm_check(release:"RHEL7", reference:"pam-devel-1.1.8-12.el7_1.1")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
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, "pam / pam-debuginfo / pam-devel");
}
}
Vendor | Product | Version | CPE |
---|---|---|---|
redhat | enterprise_linux | pam | p-cpe:/a:redhat:enterprise_linux:pam |
redhat | enterprise_linux | pam-debuginfo | p-cpe:/a:redhat:enterprise_linux:pam-debuginfo |
redhat | enterprise_linux | pam-devel | p-cpe:/a:redhat:enterprise_linux:pam-devel |
redhat | enterprise_linux | 6 | cpe:/o:redhat:enterprise_linux:6 |
redhat | enterprise_linux | 6.7 | cpe:/o:redhat:enterprise_linux:6.7 |
redhat | enterprise_linux | 7 | cpe:/o:redhat:enterprise_linux:7 |
redhat | enterprise_linux | 7.1 | cpe:/o:redhat:enterprise_linux:7.1 |
redhat | enterprise_linux | 7.2 | cpe:/o:redhat:enterprise_linux:7.2 |
redhat | enterprise_linux | 7.3 | cpe:/o:redhat:enterprise_linux:7.3 |
redhat | enterprise_linux | 7.4 | cpe:/o:redhat:enterprise_linux:7.4 |