Bug 1393454 (CVE-2016-1000031)

Summary:	CVE-2016-1000031 Apache Commons FileUpload: DiskFileItem file manipulation
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, aileenc, alazarot, alee, aszczucz, ataylor, bdawidow, carnil, chazlett, coolsvap, csutherl, dandread, dereed, dmcphers, epp-bugs, etirelli, felias, fnasser, ganandan, gvarsami, hfnukal, huwang, ivan.afonichev, java-sig-commits, jcoleman, jerboaa, jialiu, jochrist, jokerman, jolee, jpallich, jshepherd, jwon, kconner, krzysztof.daniel, kseifried, kverlaen, ldimaggi, lgao, lmeyer, lpetrovi, mbaluch, miburman, mizdebsk, mmccomas, mmraka, msimacek, mweiler, mwinkler, myarboro, nwallace, pavelp, rrajasek, rwagner, rzhang, sardella, SpikeFedora, spinder, tcunning, theute, tiwillia, tkirby, trick, twalsh, vhalbert, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-09 15:22:35 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1393687

Description Andrej Nemec 2016-11-09 15:20:38 UTC

There exists a Java Object in the Apache Commons FileUpload library that can be manipulated in such a way that when it is deserialized, it can write or copy files to disk in arbitrary locations. Furthermore, while the Object can be used alone, this new vector can be integrated with ysoserial to upload and execute binaries in a single deserialization call. This may or may not work depending on an application's implementation of the FileUpload library.

External References:

http://www.tenable.com/security/research/tra-2016-12

Comment 5 Jason Shepherd 2016-11-11 04:06:31 UTC

We agree with Apache's assessment that this does not represent a valid vulnerability in the Commons File Upload library. We have previously written about Java deserialization flaws in a Security Blog post, and encourage anyone interested in this flaw to read more our stance here:

https://access.redhat.com/blogs/766093/posts/2361811

We encourage customers developing applications in Java to assess their use of Java serialization, to ensure they add authentication, and authorization to endpoints which accept data for deserialization. If that application accepts untrusted data for deserialization, and the Commons File Upload library is available on the classpath, it could be exposed to this issue. We consider the vulnerability to be with deseriazliation of untrusted data.