| <?xml version="1.0" encoding="utf-8"?> |
| <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> |
| |
| <glsa id="200609-15"> |
| <title>GnuTLS: RSA Signature Forgery</title> |
| <synopsis> |
| GnuTLS fails to handle excess data which could allow an attacker to forge a |
| PKCS #1 v1.5 signature. |
| </synopsis> |
| <product type="ebuild">gnutls</product> |
| <announced>September 26, 2006</announced> |
| <revised>September 26, 2006: 01</revised> |
| <bug>147682</bug> |
| <access>remote</access> |
| <affected> |
| <package name="net-libs/gnutls" auto="yes" arch="*"> |
| <unaffected range="ge">1.4.4</unaffected> |
| <vulnerable range="lt">1.4.4</vulnerable> |
| </package> |
| </affected> |
| <background> |
| <p> |
| GnuTLS is an implementation of SSL 3.0 and TLS 1.0. |
| </p> |
| </background> |
| <description> |
| <p> |
| verify.c fails to properly handle excess data in |
| digestAlgorithm.parameters field while generating a hash when using an |
| RSA key with exponent 3. RSA keys that use exponent 3 are commonplace. |
| </p> |
| </description> |
| <impact type="normal"> |
| <p> |
| Remote attackers could forge PKCS #1 v1.5 signatures that are signed |
| with an RSA key, preventing GnuTLS from correctly verifying X.509 and |
| other certificates that use PKCS. |
| </p> |
| </impact> |
| <workaround> |
| <p> |
| There is no known workaround at this time. |
| </p> |
| </workaround> |
| <resolution> |
| <p> |
| All GnuTLS users should update both packages: |
| </p> |
| <code> |
| # emerge --sync |
| # emerge --update --ask --verbose ">=net-libs/gnutls-1.4.4"</code> |
| </resolution> |
| <references> |
| <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4790">CVE-2006-4790</uri> |
| </references> |
| <metadata tag="requester" timestamp="Sat, 23 Sep 2006 06:35:02 +0000"> |
| jaervosz |
| </metadata> |
| <metadata tag="submitter" timestamp="Mon, 25 Sep 2006 13:07:32 +0000"> |
| hlieberman |
| </metadata> |
| <metadata tag="bugReady" timestamp="Mon, 25 Sep 2006 18:24:37 +0000"> |
| falco |
| </metadata> |
| </glsa> |