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Gentoo Linux Security Advisory GLSA 200609-15 |
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http://security.gentoo.org/ |
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|
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Severity: Normal |
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Title: GnuTLS: RSA Signature Forgery |
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Date: September 26, 2006 |
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Bugs: #147682 |
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ID: 200609-15 |
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|
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Synopsis |
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======== |
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|
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GnuTLS fails to handle excess data which could allow an attacker to |
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forge a PKCS #1 v1.5 signature. |
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|
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Background |
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========== |
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|
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GnuTLS is an implementation of SSL 3.0 and TLS 1.0. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-libs/gnutls < 1.4.4 >= 1.4.4 |
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|
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Description |
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=========== |
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|
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verify.c fails to properly handle excess data in |
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digestAlgorithm.parameters field while generating a hash when using an |
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RSA key with exponent 3. RSA keys that use exponent 3 are commonplace. |
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|
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Impact |
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====== |
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|
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Remote attackers could forge PKCS #1 v1.5 signatures that are signed |
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with an RSA key, preventing GnuTLS from correctly verifying X.509 and |
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other certificates that use PKCS. |
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|
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Workaround |
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========== |
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|
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There is no known workaround at this time. |
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|
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Resolution |
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========== |
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|
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All GnuTLS users should update both packages: |
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|
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# emerge --sync |
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# emerge --update --ask --verbose ">=net-libs/gnutls-1.4.4" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2006-4790 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4790 |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-200609-15.xml |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2006 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |