Date: Mon, 27 Apr 2020 19:47:27 +0000 (UTC) From: Josh Paetzel <jpaetzel@FreeBSD.org> To: ports-committers@freebsd.org, svn-ports-all@freebsd.org, svn-ports-head@freebsd.org Subject: svn commit: r533163 - head/security/vuxml Message-ID: <202004271947.03RJlRuE021579@repo.freebsd.org>
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Author: jpaetzel Date: Mon Apr 27 19:47:26 2020 New Revision: 533163 URL: https://svnweb.freebsd.org/changeset/ports/533163 Log: Add entry for py-yaml vulnerability Modified: head/security/vuxml/vuln.xml Modified: head/security/vuxml/vuln.xml ============================================================================== --- head/security/vuxml/vuln.xml Mon Apr 27 18:45:02 2020 (r533162) +++ head/security/vuxml/vuln.xml Mon Apr 27 19:47:26 2020 (r533163) @@ -58,6 +58,52 @@ Notes: * Do not forget port variants (linux-f10-libxml2, libxml2, etc.) --> <vuxml xmlns="http://www.vuxml.org/apps/vuxml-1">; + <vuln vid="aae8fecf-888e-11ea-9714-08002718de91"> + <topic>py-yaml -- FullLoader (still) exploitable for arbitrary command execution</topic> + <affects> + <package> + <name>py27-yaml</name> + <name>py37-yaml</name> + <range><lt>5.3.1</lt></range> + </package> + </affects> + <description> + <body xmlns="http://www.w3.org/1999/xhtml">; + <p>Riccardo Schirone (https://github.com/ret2libc) reports:</p> + <blockquote cite="https://bugzilla.redhat.com/show_bug.cgi?id=1807367">; + <p>In FullLoader python/object/new constructor, implemented by + construct_python_object_apply, has support for setting the + state of a deserialized instance through the set_python_instance_state + method. After setting the state, some operations are performed + on the instance to complete its initialization, however it is + possible for an attacker to set the instance' state in such a way + that arbitrary code is executed by the FullLoader.</p> + <p>This patch tries to block such attacks in FullLoader by + preventing set_python_instance_state from setting arbitrar + properties. It implements a blacklist that includes extend method + (called by construct_python_object_apply) and all special + methods (e.g. __set__, __setitem__, etc.).</p> + <p>Users who need special attributes being set in the state of a + deserialized object can still do it through the UnsafeLoader, which + however should not be used on untrusted input. Additionally, they can + subclass FullLoader and redefine state_blacklist_regexp to include the + additional attributes they need, passing the subclassed loader to + yaml.load.</p> + </blockquote> + </body> + </description> + <references> + <url>https://bugzilla.redhat.com/show_bug.cgi?id=1807367</url>; + <url>https://github.com/yaml/pyyaml/pull/386</url>; + <cvename>CVE-2020-1747</cvename> + <freebsdpr>ports/245937</freebsdpr> + </references> + <dates> + <discovery>2020-03-02</discovery> + <entry>2020-04-27</entry> + </dates> + </vuln> + <vuln vid="4c52ec3c-86f3-11ea-b5b4-641c67a117d8"> <topic>py-bleach -- regular expression denial-of-service</topic> <affects>
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