Security update for libxml2 (important)

This update brings libxml2 to version 2.9.4.

These security issues were fixed:

• CVE-2016-3627: The xmlStringGetNodeList function in tree.c, when used in
  recovery mode, allowed context-dependent attackers to cause a denial of
  service (infinite recursion, stack consumption, and application crash)
  via a crafted XML document (bsc#972335).
• CVE-2016-1833: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document, a different vulnerability than CVE-2016-1834, CVE-2016-1836,
  CVE-2016-1837, CVE-2016-1838, CVE-2016-1839, and CVE-2016-1840
  (bsc#981108).
• CVE-2016-1835: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document (bsc#981109).
• CVE-2016-1837: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document, a different vulnerability than CVE-2016-1833, CVE-2016-1834,
  CVE-2016-1836, CVE-2016-1838, CVE-2016-1839, and CVE-2016-1840
  (bsc#981111).
• CVE-2016-1836: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document, a different vulnerability than CVE-2016-1833, CVE-2016-1834,
  CVE-2016-1837, CVE-2016-1838, CVE-2016-1839, and CVE-2016-1840
  (bsc#981110).
• CVE-2016-1839: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document, a different vulnerability than CVE-2016-1833, CVE-2016-1834,
  CVE-2016-1836, CVE-2016-1837, CVE-2016-1838, and CVE-2016-1840
  (bsc#981114).
• CVE-2016-1838: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document, a different vulnerability than CVE-2016-1833, CVE-2016-1834,
  CVE-2016-1836, CVE-2016-1837, CVE-2016-1839, and CVE-2016-1840
  (bsc#981112).
• CVE-2016-1840: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document, a different vulnerability than CVE-2016-1833, CVE-2016-1834,
  CVE-2016-1836, CVE-2016-1837, CVE-2016-1838, and CVE-2016-1839
  (bsc#981115).
• CVE-2016-4483: out-of-bounds read parsing an XML using recover mode
  (bnc#978395).
• CVE-2016-1834: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document, a different vulnerability than CVE-2016-1833, CVE-2016-1836,
  CVE-2016-1837, CVE-2016-1838, CVE-2016-1839, and CVE-2016-1840
  (bsc#981041).
• CVE-2016-3705: The (1) xmlParserEntityCheck and (2)
  xmlParseAttValueComplex functions in parser.c in libxml2 did not
  properly keep track of the recursion depth, which allowed
  context-dependent attackers to cause a denial of service (stack
  consumption and application crash) via a crafted XML document containing
  a large number of nested entity references (bsc#975947).
• CVE-2016-1762: libxml2 allowed remote attackers to execute arbitrary
  code or cause a denial of service (memory corruption) via a crafted XML
  document (bsc#981040).

This non-security issue was fixed:

• bnc#983288: Fix attribute decoding during XML schema validation