CentOS Update for dhclient CESA-2011:1819 centos6

# SPDX-FileCopyrightText: 2012 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_xref(name:"URL", value:"http://lists.centos.org/pipermail/centos-announce/2011-December/018339.html");
  script_oid("1.3.6.1.4.1.25623.1.0.881271");
  script_version("2026-04-24T06:23:04+0000");
  script_tag(name:"last_modification", value:"2026-04-24 06:23:04 +0000 (Fri, 24 Apr 2026)");
  script_tag(name:"creation_date", value:"2012-07-30 17:14:39 +0530 (Mon, 30 Jul 2012)");
  script_cve_id("CVE-2011-4539");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_xref(name:"CESA", value:"2011:1819");
  script_name("CentOS Update for dhclient CESA-2011:1819 centos6");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'dhclient'
  package(s) announced via the referenced advisory.");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2012 Greenbone AG");
  script_family("CentOS Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/centos", "ssh/login/rpms", re:"ssh/login/release=CentOS6");
  script_tag(name:"affected", value:"dhclient on CentOS 6");
  script_tag(name:"solution", value:"Please install the updated packages.");
  script_tag(name:"insight", value:"The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows
  individual devices on an IP network to get their own network configuration
  information, including an IP address, a subnet mask, and a broadcast
  address.

  A denial of service flaw was found in the way the dhcpd daemon handled DHCP
  request packets when regular expression matching was used in
  '/etc/dhcp/dhcpd.conf'. A remote attacker could use this flaw to crash
  dhcpd. (CVE-2011-4539)

  Users of DHCP should upgrade to these updated packages, which contain a
  backported patch to correct this issue. After installing this update, all
  DHCP servers will be restarted automatically.");
  script_tag(name:"qod_type", value:"package");
  script_tag(name:"solution_type", value:"VendorFix");
  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-rpm.inc");

release = rpm_get_ssh_release();
if(!release)
  exit(0);

res = "";

if(release == "CentOS6")
{

  if ((res = isrpmvuln(pkg:"dhclient", rpm:"dhclient~4.1.1~25.P1.el6_2.1", rls:"CentOS6")) != NULL)
  {
    security_message(data:res);
    exit(0);
  }

  if ((res = isrpmvuln(pkg:"dhcp", rpm:"dhcp~4.1.1~25.P1.el6_2.1", rls:"CentOS6")) != NULL)
  {
    security_message(data:res);
    exit(0);
  }

  if ((res = isrpmvuln(pkg:"dhcp-common", rpm:"dhcp-common~4.1.1~25.P1.el6_2.1", rls:"CentOS6")) != NULL)
  {
    security_message(data:res);
    exit(0);
  }

  if ((res = isrpmvuln(pkg:"dhcp-devel", rpm:"dhcp-devel~4.1.1~25.P1.el6_2.1", rls:"CentOS6")) != NULL)
  {
    security_message(data:res);
    exit(0);
  }

  if (__pkg_match) exit(99);
  exit(0);
}