Amazon Linux: Security Advisory (ALAS-2012-89)

# Copyright (C) 2015 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.120134");
  script_cve_id("CVE-2012-0876", "CVE-2012-1148");
  script_tag(name:"creation_date", value:"2015-09-08 11:18:19 +0000 (Tue, 08 Sep 2015)");
  script_version("2022-01-05T14:03:08+0000");
  script_tag(name:"last_modification", value:"2022-01-05 14:03:08 +0000 (Wed, 05 Jan 2022)");
  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_name("Amazon Linux: Security Advisory (ALAS-2012-89)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2015 Greenbone Networks GmbH");
  script_family("Amazon Linux Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/amazon_linux", "ssh/login/release");

  script_xref(name:"Advisory-ID", value:"ALAS-2012-89");
  script_xref(name:"URL", value:"https://alas.aws.amazon.com/ALAS-2012-89.html");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'expat' package(s) announced via the ALAS-2012-89 advisory.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"A denial of service flaw was found in the implementation of hash arrays in Expat. An attacker could use this flaw to make an application using Expat consume an excessive amount of CPU time by providing a specially-crafted XML file that triggers multiple hash function collisions. To mitigate this issue, randomization has been added to the hash function to reduce the chance of an attacker successfully causing intentional collisions. (CVE-2012-0876)

A memory leak flaw was found in Expat. If an XML file processed by an application linked against Expat triggered a memory re-allocation failure, Expat failed to free the previously allocated memory. This could cause the application to exit unexpectedly or crash when all available memory is exhausted. (CVE-2012-1148)");

  script_tag(name:"affected", value:"'expat' package(s) on Amazon Linux.");

  script_tag(name:"solution", value:"Please install the updated package(s).");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"package");

  exit(0);
}

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

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

res = "";
report = "";

if(release == "AMAZON") {

  if(!isnull(res = isrpmvuln(pkg:"expat", rpm:"expat~2.0.1~11.9.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"expat-debuginfo", rpm:"expat-debuginfo~2.0.1~11.9.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"expat-devel", rpm:"expat-devel~2.0.1~11.9.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

exit(0);