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| <div id="ConfluenceContent"><p>----<span style="text-decoration: line-through;">BEGIN PGP SIGNED MESSAGE</span>----<br clear="none"> |
| Hash: SHA1</p> |
| |
| |
| <p>Another attack has emerged on the XML Encryption standard, as described by<br clear="none"> |
| the security advisory CVE-2011-2487:</p> |
| |
| <p><a shape="rect" class="external-link" href="https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-2487" rel="nofollow">https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-2487</a></p> |
| |
| <p>Tibor Jager, Sebastian Schinzel and Juraj Somorovsky have published a paper<br clear="none"> |
| that describes a number of attacks on the PKCS#1 v1.5 Key Transport Algorithm,<br clear="none"> |
| used to encrypt symmetric keys as part of WS-Security. One of these attacks<br clear="none"> |
| exploits the fact that WSS4J can leak information about where a particular<br clear="none"> |
| decryption operation fails. This bug has been fixed in WSS4J 1.6.5, where a <br clear="none"> |
| new symmetric key is generated if the decryption of the encrypted key fails. <br clear="none"> |
| In this way it is not possible for an attacker to find out whether a decryption<br clear="none"> |
| failure was due to the failure of decrypting the key or the data.</p> |
| |
| <p>Migration:</p> |
| |
| <p>Any version of CXF that uses Apache WSS4J 1.6.4 or below is vulnerable to this<br clear="none"> |
| attack. </p> |
| |
| <p>CXF 2.5.2 users or below should upgrade to the latest version of CXF 2.5.x.<br clear="none"> |
| CXF 2.4.6 users or below should upgrade to the latest version of CXF 2.4.x.<br clear="none"> |
| CXF 2.6 and 2.7 are unaffected.</p> |
| |
| <p>Additional Recommendation:</p> |
| |
| <p>It is recommended that the use of the RSA v1.5 key transport algorithm be<br clear="none"> |
| discontinued. Instead the RSA-OAEP key transport algorithm should be used.<br clear="none"> |
| This algorithm is used by default from WSS4J 1.6.8 onwards. If you are using<br clear="none"> |
| WS-SecurityPolicy, then make sure not to use the AlgorithmSuite policies ending<br clear="none"> |
| in "Rsa15".</p> |
| |
| |
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