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<a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#326ca6;">Ian Young</a>
created <img src="https://issues.shibboleth.net/jira/images/icons/improvement.gif" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> <a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/XSTJ-38'>XSTJ-38</a>
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<a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/XSTJ-38'><strong>blacklist MD5 and other digest algorithms weaker than SHA-1</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://issues.shibboleth.net/jira/images/icons/improvement.gif" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> Improvement
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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1.2.0 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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<a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#326ca6;">Ian Young</a>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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16/Mar/13 8:47 AM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>If a key has ever been used to digitally sign some document using a weak digest algorithm such as MD5, I think there is from that time always a potential for an attack which re-uses that digest value. Just because xmlsectool doesn't provide a way (prior to 1.2.0) to produce such signatures does not mean they have never been produced.</p>
<p style='margin-top:0;margin-bottom:10px;'>This probably means that we should be blacklisting all digest algorithms weaker than SHA-1 (MD-5 and RIPEMD-160?) which are supported by the crypto stack we are using, during digital signature verification. This means blacklisting their use as a digest algorithm and as part of a signature algorithm. So, both MD5 itself but also RSA+MD5, for example.</p>
<p style='margin-top:0;margin-bottom:10px;'>If we do this, we probably need a way to add to the blacklist on the command line (using URIs, but perhaps also digest names), as well as to clear the blacklist for people who really want to take responsibility.</p>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#326ca6;" href="https://issues.shibboleth.net/jira/browse/XSTJ">XML Security Tool - Java</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://issues.shibboleth.net/jira/images/icons/priority_major.gif" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#326ca6;">Ian Young</a>
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