svn commit: r533163 - head/security/vuxml
Josh Paetzel
jpaetzel at FreeBSD.org
Mon Apr 27 19:47:27 UTC 2020
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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