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vulnerability announce CVE-2007-5273 CVE-2007-5274 CVE-2007-5275

Java JRE, Flash: bypassing DNS pinning

Synthesis of the vulnerability

An attacker can create a HTML page calling a plugin and bypassing the DNS pinning protection included in web browsers.
Severity of this threat: 1/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 11/10/2007.
Références of this weakness: 103078, 6569621, 6609269, APSB07-20, CVE-2007-5273, CVE-2007-5274, CVE-2007-5275, CVE-2007-5375, RHSA-2007:1126-01, SUSE-SA:2008:025, VIGILANCE-VUL-7238, VMSA-2008-00010.3.
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Description of the vulnerability

A "DNS rebinding" attack has the objective to force the web browser to connect to a server different than the one which provided the HTML document. This vulnerability for example permits to scan ports or to obtain information without going through the firewall.

This attack uses the following method:
 - Attacker setups a DNS server for his "attacker.dom" domain. This server answers that IP address of www.attacker.dom is, with a TTL of 10 seconds.
 - Attacker setups a web server to host a HTML page containing a script creating a connection to the originating server.
 - Attacker invites victim to connect to his web server.
 - When the HTML page is displayed, the script tries to access to the server: as the TTL expired, the web browser sends a new DNS query. However, this time, attacker's DNS server indicates the IP address of www.attacker.dom is
 - Script thus connects to the address which is an internal address.

To protect against this attack, web browsers implement "DNS pinning" which consists in storing IP addresses in the cache whatever the duration indicated by the TTL. However, cache of plugins is different than cache of web browser, which permits to bypass this protection.

An attack can be created on the JVM by using LiveConnect, an Applet with an HTTP proxy or Relative Paths. [severity:1/4; 103078, 6569621, 6609269, CVE-2007-5273, CVE-2007-5274, CVE-2007-5375]

An attack can be created on the Flash plugin which also uses a separate cache. [severity:1/4; CVE-2007-5275]
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This cybersecurity threat impacts software or systems such as Flash Player, Windows (platform) ~ not comprehensive, NLD, OES, Java Oracle, Solaris, Trusted Solaris, RHEL, SLES, Unix (platform) ~ not comprehensive, ESX.

Our Vigil@nce team determined that the severity of this computer threat note is low.

The trust level is of type confirmed by the editor, with an origin of internet server.

This bulletin is about 2 vulnerabilities.

An attacker with a expert ability can exploit this security threat.

Solutions for this threat

Flash Player: version
Version is corrected:
An update is also available for Flash Player 7:
An update is also available for other versions:

Java JDK/JRE 6: version 6 Update 3.
Version 6 Update 3 is corrected:
For Solaris :
  * Java SE 6: patch 125136-04
  * Java SE 6 64bit: patch 125137-04
  * Java SE 6_x86: patch 125138-04
  * Java SE 6_x86 64 bit: patch 125139-04
Previous versions have to be uninstalled.

Java JDK/JRE 5: version 5 Update 13.
Version 5 Update 13 is corrected:
For Solaris :
  Sparc :
    32 bits : patch 118666-14
    64 bits : patch 118667-14
  x86 :
    32 bits : patch 118668-14
    64 bits : patch 118669-14
Previous versions have to be uninstalled.

Java SDK/JRE 1.4.2: version 1.4.2_16.
Version 1.4.2_16 is corrected:
Previous versions have to be uninstalled.

Java SDK/JRE 1.3.1: version 1.3.1_21.
Version 1.3.1_21 is corrected:
Previous versions have to be uninstalled.

RHEL 3, 4, 5 Extras: new flash-plugin packages.
New packages are available:
Red Hat Enterprise Linux version 3 Extras: flash-plugin-
Red Hat Enterprise Linux version 4 Extras: flash-plugin-
RHEL version 5 Supplementary : flash-plugin-

SUSE: new IBM Java packages.
New packages are available:
   SUSE Linux Enterprise Desktop 10 SP1
   SUSE Linux Enterprise Server 10 SP1
   SLE SDK 10 SP1
   Open Enterprise Server
   Novell Linux POS 9

VMware ESX: patch for Tomcat and Java JRE.
A patch is available:
VMware ESX 3.5 patch ESX350-200806404-SG
md5sum: 669e97880a21cce13eb7e9051f403162
ESX 3.0.3 patch ESX303-200808407-SG
md5sum: 083cee0475a8f73e511199800e8c3af4
ESX 3.0.2 patch ESX-1006360
md5sum: 5d2d629b6c4b1894571742569ae2e2da
ESX 3.0.1 patch ESX-1006359
md5sum: 2224d6e27b86f3155ce9d5895f1f191a
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