Debian DLA-355-1 : libxml2 security update

2015-11-30T00:00:00
ID DEBIAN_DLA-355.NASL
Type nessus
Reporter Tenable
Modified 2016-05-19T00:00:00

Description

CVE-2015-8241 Buffer overread with XML parser in xmlNextChar

CVE-2015-8317

  • issues in the xmlParseXMLDecl function: If we fail conversing the current input stream while processing the encoding declaration of the XMLDecl then it's safer to just abort there and not try to report further errors.

  • If the string is not properly terminated do not try to convert to the given encoding.

Additional fix for off by one error in previous patch for CVE-2015-7942 (thanks to Salvatore for spotting this)

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-355-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(87076);
  script_version("$Revision: 2.5 $");
  script_cvs_date("$Date: 2016/05/19 17:45:43 $");

  script_cve_id("CVE-2015-8241", "CVE-2015-8317");
  script_osvdb_id(130435, 130641, 130642);

  script_name(english:"Debian DLA-355-1 : libxml2 security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"CVE-2015-8241 Buffer overread with XML parser in xmlNextChar

CVE-2015-8317

  - issues in the xmlParseXMLDecl function: If we fail
    conversing the current input stream while processing the
    encoding declaration of the XMLDecl then it's safer to
    just abort there and not try to report further errors.

  - If the string is not properly terminated do not try to
    convert to the given encoding.

Additional fix for off by one error in previous patch for
CVE-2015-7942 (thanks to Salvatore for spotting this)

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2015/11/msg00016.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/squeeze-lts/libxml2"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-libxml2-dbg");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/11/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/11/30");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"6.0", prefix:"libxml2", reference:"2.7.8.dfsg-2+squeeze15")) flag++;
if (deb_check(release:"6.0", prefix:"libxml2-dbg", reference:"2.7.8.dfsg-2+squeeze15")) flag++;
if (deb_check(release:"6.0", prefix:"libxml2-dev", reference:"2.7.8.dfsg-2+squeeze15")) flag++;
if (deb_check(release:"6.0", prefix:"libxml2-doc", reference:"2.7.8.dfsg-2+squeeze15")) flag++;
if (deb_check(release:"6.0", prefix:"libxml2-utils", reference:"2.7.8.dfsg-2+squeeze15")) flag++;
if (deb_check(release:"6.0", prefix:"python-libxml2", reference:"2.7.8.dfsg-2+squeeze15")) flag++;
if (deb_check(release:"6.0", prefix:"python-libxml2-dbg", reference:"2.7.8.dfsg-2+squeeze15")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");