Upgrade to nokogiri 1.7.2 #4
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Fixes the vulnerabilities mentioned below:
USN-3271-1 - UPSTREAM LIBXSLT VULNERABILITIES
CVE-2017-5029: The xsltAddTextString function in transform.c lacks a check for integer overflow during a size calculation, which allows a remote attacker to perform an out of bounds memory write via a crafted HTML page.
CVE-2016-1683: numbers.c in libxslt mishandles namespace nodes, which allows remote attackers to cause a denial of service (out-of-bounds heap memory access) or possibly have unspecified other impact via a crafted document.
CVE-2016-1841: libxslt allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.
Fixed versions: 1.7.2
Identifier: USN-3271-1
Solution: Upgrade to latest version.
Sources: sparklemotion/nokogiri#1634
http://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-5029.html
http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-4738.html