Posts tagged Java SE 7

CVE-2012-1533 Oracle Java Web Start Vulnerability Metasploit Demo

Timeline :

Vulnerability fixed by Oracle the 2012-10-16
Details on the vulnerability provided by Rh0 the 2013-06-09
Metasploit PoC provided the 2013-06-12

PoC provided by :


Reference(s) :

Oracle Java SE Critical Patch Update Advisory – October 2012
Rh0 Pastebin

Affected version(s) :

JSE 7 Update 7 and before
JSE 6 Update 35 and before

Tested on Windows XP Pro with :

JSE 7 Update 7

Description :

This module exploits a flaw in the Web Start component of the Oracle Java Runtime Environment. Parameters intial-heap-size and max-heap-size in a JNLP file can contain a double quote which is not properly sanitized when creating the command line for javaw.exe. This allows the injection of the -XXaltjvm option to load a jvm.dll from a remote UNC path into the java process. Thus an attacker can execute arbitrary code in the context of a browser user. This flaw was fixed in Oct. 2012 and affects JSE 6 Update 35 and before, and JSE 7 Update 7 and before. In order for this module to work, it must be ran as root on a server that does not serve SMB. Additionally, the target host must have the WebClient service (WebDAV Mini-Redirector) enabled. Alternatively an UNC path containing a jvm.dll can be specified with an own SMB server.

Commands :

use exploit/windows/browser/java_ws_double_quote
set PAYLOAD windows/meterpreter/reverse_tcp


CVE-2013-2423 – Java 7u17 Applet Reflection Type Confusion RCE Metasploit Demo

Timeline :

Vulnerability discovered and reported to vendor by Jeroen Frijters
Vulnerability corrected in April CPU the 2013-04-16
Vulnerability publicly disclosed by Jeroen Frijters the 2013-04-17
Metasploit PoC provided the 2013-04-20

PoC provided by :

Jeroen Frijters
juan vazquez

Reference(s) :

Oracle Java April 2013 CPU

Affected version(s) :

JDK and JRE 7 Update 17 and earlier

Tested on Windows XP Pro SP3 with :

JDK and JRE 7 Update 17

Description :

This module abuses Java Reflection to generate a Type Confusion, due to a weak access control when setting final fields on static classes, and run code outside of the Java Sandbox. The vulnerability affects Java version 7u17 and earlier. This exploit doesn’t bypass click-to-play, so the user must accept the java warning in order to run the malicious applet.

Commands :

use exploit/multi/browser/java_jre17_reflection_types
set TARGET 1
set PAYLOAD windows/meterpreter/reverse_tcp


Oracle Java Critical Patch Update April 2013 Review

Oracle has provide his Java Critical Patch Update (CPU) for April 2013 who has been released on Tuesday, April 16. On the 42 security vulnerabilities fixed in this CPU, 39 of them may be remotely exploitable. The highest CVSS Base Score for vulnerabilities in this CPU is 10.0.

This update fix the vulnerabilities exploited by James Forshaw (tyranid), Joshua J. Drake and VUPEN Security during Pwn20wn 2013. But this update is also fixing vulnerabilities reported by Adam Gowdiak of Security Explorations and other security researchers.

As you may know Oracle is using CVSS 2.0 (Common Vulnerability Scoring System) in order to score the reported vulnerabilities. But as you also may know security researchers disagree with the usage of CVSS by Oracle. Oracle play with CVSS score by creating a “Partial+” impact rating how don’t exist in CVSS 2.0, and by interpreting the “Complete” rating in a different way than defined in CVSS 2.0.

Affected products are:

  • JDK and JRE 7 Update 17 and earlier
  • JDK and JRE 6 Update 43 and earlier
  • JDK and JRE 5.0 Update 41 and earlier
  • JavaFX 2.2.7 and earlier

Proposed updates are:

  • JDK and JRE 7 Update 21
  • JDK and JRE 6 Update 45
  • JDK and JRE 5.0 Update 43
  • JavaFX 2.2.21

19 (45,24%) of the vulnerabilities have a CVSS base score of 10.0, 28 (66,67%) of the vulnerabilities have a high CVSS base score (CVSS => 7.0), 13 (30,95%) of the vulnerabilities have a medium CVSS base score (CVSS >= 4.0 < 7.0) and 1 (2,38%) of the vulnerabilities has a low CVSS base score (CVSS < 4.0). Also 25 (59,52%) of the vulnerabilities affects Java SE 6 and 42 (100%) of the vulnerabilities are affecting Java SE 7.

Also some modifications have been done in the Security Levels provided by Oracle. Previously five levels were existing (Very-High, High, Medium, Low and Custom), in the new provided version only three levels are still existing (Very-High, High and Medium).


But, there is always a but with Oracle, they don’t seem to have enable, by default, the check for revocation using Certificate Revocation Lists (CRLs) despite that some bad guys are using valid stollen and revoked certificates to sign malware’s.


So we advise you to update asap, enable the CRL check, if you still have Oracle Java plug-in installed !

Oracle update to Java 7 Update 17 and to Java 6 Update 43, but…

Oracle, stressed by the new Java 0day discovered exploited in the wild, seem to have release new updates for Java 7, Java 6 and Java 5. Java 7 is updated to version 1.7.0_17, Java 6 is updated to version 1.6.0_43 and Java 5 is updated to version 1.5.0_41.


These update are pushed an “Oracle Security Alert for CVE-2013-1493” who fix CVE-2013-1493 vulnerability related to the Java 0day, but also another vulnerability, aka CVE-2013-0809, affecting Java running in web browsers. Both vulnerabilities have a CVSS base score of 10.0 and are remotely exploitable without authentication.

Vulnerabilities are credited to an anonymous Reporter of TippingPoint’s Zero Day Initiative, axtaxt via Tipping Point’s Zero Day Initiative, Darien Kindlund of FireEye, Vitaliy Toropov via iDefense and to Vitaliy Toropov via TippingPoint. As you may remember, CVE-2013-1493 was discovered exploited in the wild by FireEye, but it seem that this vulnerability was also previously discovered by a security researcher working with 0day brokers. It is not the first time that we see 0days exploited in the wild, previously reported to 0day brokers !

Also, Security Explorations, a security firm responsible for identifying most of the latest Java vulnerabilities, is not credited for any of the patched vulnerabilities. So they are still bunch off reported vulnerabilities in Java.

Last but not least, Security Explorations has report, today, five new security issues for Java 7 who can be used to gain a complete Java security sandbox bypass in the environmentof Java SE 7 Update 15.

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